1
|
Pinheiro JP, Rotureau E. Electroanalytical Trace Metal Cations Quantification and Speciation in Freshwaters: Historical Overview, Critical Review of the Last Five Years and Road Map for Developing Dynamic Speciation Field Measurements. Molecules 2023; 28:molecules28062831. [PMID: 36985802 PMCID: PMC10056914 DOI: 10.3390/molecules28062831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 03/17/2023] [Accepted: 03/17/2023] [Indexed: 03/30/2023] Open
Abstract
An historical overview covering the field of electroanalytical metal cations speciation in freshwaters is presented here, detailing both the notable experimental and theoretical developments. Then, a critical review of the progress in the last five years is given, underlining in particular the improvements in electrochemical setups and methodologies dedicated to field surveys. Given these recent achievements, a road map to carry out on-site dynamic metal speciation measurements is then proposed, and the key future developments are discussed. This review shows that electroanalytical stripping techniques provide a unique framework for quantitatively assessing metals at trace levels while offering access to both thermodynamic and dynamic features of metal complexation with natural colloidal and particulate ligands.
Collapse
Affiliation(s)
- José Paulo Pinheiro
- Université de Lorraine, CNRS, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), F-54000 Nancy, France
| | - Elise Rotureau
- Université de Lorraine, CNRS, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), F-54000 Nancy, France
| |
Collapse
|
2
|
Rotureau E, Pinheiro JP, Duval JF. On the evaluation of the intrinsic stability of indium-nanoparticulate organic matter complexes. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128859] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
3
|
McDonald S, Holland A, Simpson SL, Gadd JB, Bennett WW, Walker GW, Keough MJ, Cresswel T, Hassell KL. Metal forms and dynamics in urban stormwater runoff: New insights from diffusive gradients in thin-films (DGT) measurements. WATER RESEARCH 2022; 209:117967. [PMID: 34936976 DOI: 10.1016/j.watres.2021.117967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 12/01/2021] [Accepted: 12/12/2021] [Indexed: 06/14/2023]
Abstract
Stormwater runoff typically contains significant quantities of metal contaminants that enter urban waterways over short durations and represent a potential risk to water quality. The origin of metals within the catchment and processes that occur over the storm can control the partitioning of metals between a range of different forms. Understanding the fraction of metals present in a form that is potentially bioavailable to aquatic organisms is useful for environmental risk assessment. To help provide this information, the forms and dynamics of metal contaminants in an urban system were assessed across a storm. Temporal patterns in the concentration of metals in dissolved and particulate (total suspended solids; TSS) forms were assessed from water samples, and diffusive gradients in thin-films (DGTs) were deployed to measure the DGT-labile time-integrated metal concentration. Results indicate that the concentrations of dissolved and TSS-associated metals increased during the storm, with the metals Al, Cd, Co, Cu, Pb and Zn representing the greatest concern relative to water quality guideline values (GVs). The portion of labile metal as measured by DGT devices indicated that during the storm a substantial fraction (∼98%) of metals were complexed and pose a lower risk of acute toxicity to aquatic organisms. Comparison of DGT results to GVs indicate that current GVs are likely quite conservative when assessing stormwater pollution risks with regards to metal contaminants. This study provides valuable insight into the forms and dynamics of metals in an urban system receiving stormwater inputs and assists with the development of improved approaches for the assessment of short-term, intermittent discharge events.
Collapse
Affiliation(s)
- Sarah McDonald
- The School of BioSciences, The University of Melbourne, Parkville Campus, Parkville, Victoria 3010, Australia.
| | - Aleicia Holland
- Department of Ecology, Environment and Evolution, School of Life Science, La Trobe University, Albury-Wodonga Campus, Albury-Wodonga, Victoria 3690, Australia
| | - Stuart L Simpson
- CSIRO Land and Water, Centre for Environmental Contaminants Research, Locked Bag 2007 Kirrawee, New South Wales 2232, Australia
| | - Jennifer B Gadd
- National Institute of Water and Atmospheric Research Ltd, Private Bag 99940, Viaduct Harbour, Auckland 1010, New Zealand
| | - William W Bennett
- Coastal and Marine Research Centre, Cities Research Institute, Griffith University, Gold Coast Campus, Queensland 4222, Australia
| | - Glen W Walker
- Australian Government Department of Agriculture, Water and the Environment, Canberra, ACT 2601, Australia
| | - Michael J Keough
- The School of BioSciences, The University of Melbourne, Parkville Campus, Parkville, Victoria 3010, Australia
| | - Tom Cresswel
- ANSTO, Locked Bag 2001 Kirrawee, New South Wales 2232, Australia
| | - Kathryn L Hassell
- The School of BioSciences, The University of Melbourne, Parkville Campus, Parkville, Victoria 3010, Australia; Aquatic Environmental Stress Research Group (AQUEST), School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| |
Collapse
|
4
|
Developing On-Site Trace Level Speciation of Lead, Cadmium and Zinc by Stripping Chronopotentiometry (SCP): Fast Screening and Quantification of Total Metal Concentrations. Molecules 2021; 26:molecules26185502. [PMID: 34576972 PMCID: PMC8465749 DOI: 10.3390/molecules26185502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 09/03/2021] [Accepted: 09/06/2021] [Indexed: 11/17/2022] Open
Abstract
Electrochemical stripping techniques are interesting candidates for carrying out onsite speciation of environmentally relevant trace metals due to the existing low-cost portable instrumentation available and the low detection limits that can be achieved. In this work, we describe the initial analytical technique method development by quantifying the total metal concentrations using Stripping Chronopotentiometry (SCP). Carbon paste screen-printed electrodes were modified with thin films of mercury and used to quantify sub-nanomolar concentrations of lead and cadmium and sub-micromolar concentrations of zinc in river water. Low detection limits of 0.06 nM for Pb(II) and 0.04 nM for Cd(II) were obtained by the standard addition method using a SCP deposition time of 180 s. The SCP results obtained for Pb(II) and Cd(II) agreed with those of inductively coupled plasma mass spectrometry (ICP-MS). The coupling of SCP with screen-printed electrodes opens up excellent potential for the development of onsite speciation of trace metals. Due to the low analysis throughput obtained for the standard addition method, we also propose a new, more rapid screening Cd(II) internal standard methodology to significantly increase the number of samples that can be analyzed per day.
Collapse
|
5
|
Duval JF, van Leeuwen HP, Norde W, Town RM. Chemodynamic features of nanoparticles: Application to understanding the dynamic life cycle of SARS-CoV-2 in aerosols and aqueous biointerfacial zones. Adv Colloid Interface Sci 2021; 290:102400. [PMID: 33713994 PMCID: PMC7931671 DOI: 10.1016/j.cis.2021.102400] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 02/27/2021] [Accepted: 03/01/2021] [Indexed: 12/23/2022]
Abstract
We review concepts involved in describing the chemodynamic features of nanoparticles and apply the framework to gain physicochemical insights into interactions between SARS-CoV-2 virions and airborne particulate matter (PM). Our analysis is highly pertinent given that the World Health Organisation acknowledges that SARS-CoV-2 may be transmitted by respiratory droplets, and the US Center for Disease Control and Prevention recognises that airborne transmission of SARS-CoV-2 can occur. In our theoretical treatment, the virion is assimilated to a core-shell nanoparticle, and contributions of various interaction energies to the virion-PM association (electrostatic, hydrophobic, London-van der Waals, etc.) are generically included. We review the limited available literature on the physicochemical features of the SARS-CoV-2 virion and identify knowledge gaps. Despite the lack of quantitative data, our conceptual framework qualitatively predicts that virion-PM entities are largely able to maintain equilibrium on the timescale of their diffusion towards the host cell surface. Comparison of the relevant mass transport coefficients reveals that virion biointernalization demand by alveolar host cells may be greater than the diffusive supply. Under such conditions both the free and PM-sorbed virions may contribute to the transmitted dose. This result points to the potential for PM to serve as a shuttle for delivery of virions to host cell targets. Thus, our critical review reveals that the chemodynamics of virion-PM interactions may play a crucial role in the transmission of COVID-19, and provides a sound basis for explaining reported correlations between episodes of air pollution and outbreaks of COVID-19.
Collapse
|
6
|
Pinheiro JP, Rotureau E, Duval JFL. Addressing the electrostatic component of protons binding to aquatic nanoparticles beyond the Non-Ideal Competitive Adsorption (NICA)-Donnan level: Theory and application to analysis of proton titration data for humic matter. J Colloid Interface Sci 2020; 583:642-651. [PMID: 33039861 DOI: 10.1016/j.jcis.2020.09.059] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/14/2020] [Accepted: 09/15/2020] [Indexed: 11/19/2022]
Abstract
HYPOTHESIS Charge descriptors of aquatic nanoparticles (NPs) are evaluated from proton titration curves measured at different salt concentrations and routinely analysed by the Non-Ideal Competitive Adsorption-Donnan (NICAD) model. This model, however, suffers from approximations regarding particle electrostatics, which may bias particle charge estimation. Implementation of Poisson-Boltzmann (PB) theory within consistent treatment of NPs protolytic data is expected to address NICAD shortcomings. EXPERIMENTS An alternative to NICAD is elaborated on the basis of nonlinearized PB equation for soft particle electrostatics to properly unravel the electrostatic and chemical components of proton binding to NPs. A numerical package is developed for automated analysis of proton titration curves and proton affinity spectra at different salt concentrations. The performance of the method is illustrated for humic matter nanoparticles with different charge and size, and compared to that of NICAD. FINDINGS Unlike NICAD, PB-based treatment successfully reproduces particle charge dependence on pH for practical salt concentrations from the thin to thick electric double layer limit. Donnan representation in NICAD leads to moderate to dramatic misestimations of proton affinity and binding heterogeneity depending on particle size to Debye layer thickness ratio. Interpretation of NPs protolytic properties with PB theory further avoids adjustment of the 'particle Donnan volume' empirically introduced in NICAD.
Collapse
Affiliation(s)
- José Paulo Pinheiro
- Université de Lorraine, CNRS, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), UMR 7360, Vandoeuvre-lès-Nancy F-54000, France
| | - Elise Rotureau
- Université de Lorraine, CNRS, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), UMR 7360, Vandoeuvre-lès-Nancy F-54000, France
| | - Jérôme F L Duval
- Université de Lorraine, CNRS, Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), UMR 7360, Vandoeuvre-lès-Nancy F-54000, France.
| |
Collapse
|
7
|
Full wave analysis of stripping chronopotentiometry at scanned deposition potential (SSCP): Obtaining binding curves in labile heterogeneous macromolecular systems for any metal-to-ligand ratio. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114436] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
8
|
Town RM, van Leeuwen HP, Duval JFL. Rigorous Physicochemical Framework for Metal Ion Binding by Aqueous Nanoparticulate Humic Substances: Implications for Speciation Modeling by the NICA-Donnan and WHAM Codes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:8516-8532. [PMID: 31291104 DOI: 10.1021/acs.est.9b00624] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Latest knowledge on the reactivity of charged nanoparticulate complexants toward aqueous metal ions is discussed in mechanistic detail. We present a rigorous generic description of electrostatic and chemical contributions to metal ion binding by nanoparticulate complexants, and their dependence on particle size, particle type (i.e., reactive sites distributed within the particle body or confined to the surface), ionic strength of the aqueous medium, and the nature of the metal ion. For the example case of soft environmental particles such as fulvic and humic acids, practical strategies are delineated for determining intraparticulate metal ion speciation, and for evaluating intrinsic chemical binding affinities and heterogeneity. The results are compared with those obtained by popular codes for equilibrium speciation modeling (namely NICA-Donnan and WHAM). Physicochemical analysis of the discrepancies generated by these codes reveals the a priori hypotheses adopted therein and the inappropriateness of some of their key parameters. The significance of the characteristic time scales governing the formation and dissociation rates of metal-nanoparticle complexes in defining the relaxation properties and the complete equilibration of the metal-nanoparticulate complex dispersion is described. The dynamic features of nanoparticulate complexes are also discussed in the context of predictions of the labilities and bioavailabilities of the metal species.
Collapse
Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology , University of Antwerp , Groenenborgerlaan 171 , 2020 Antwerp , Belgium
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
| | - Jérôme F L Duval
- CNRS - Université de Lorraine , Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), UMR 7360 CNRS , 15 avenue du Charmois , 54500 Vandoeuvre-les-Nancy , France
| |
Collapse
|
9
|
Town RM, van Leeuwen HP, Blust R. Biochemodynamic Features of Metal Ions Bound by Micro- and Nano-Plastics in Aquatic Media. Front Chem 2018; 6:627. [PMID: 30631763 PMCID: PMC6315154 DOI: 10.3389/fchem.2018.00627] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 12/03/2018] [Indexed: 12/15/2022] Open
Abstract
A simple model, based on spherical geometry, is applied to the description of release kinetics of metal species from nano- and micro-plastic particles. Compiled literature data show that the effective diffusion coefficients, D eff, for metal species within plastic polymer bodies are many orders of magnitude lower than those applicable for metal ions in bulk aqueous media. Consequently, diffusion of metal ions in the aqueous medium is much faster than that within the body of the plastic particle. So long as the rate of dissociation of any inner-sphere metal complexes is greater than the rate of diffusion within the particle body, the latter process is the limiting step in the overall release kinetics of metal species that are sorbed within the body of the plastic particle. Metal ions that are sorbed at the very particle/medium interface and/or associated with surface-sorbed ligands do not need to traverse the particle body and thus in the diffusion-limiting case, their rate of release will correspond to the rate of diffusion in the aqueous medium. Irrespective of the intraparticulate metal speciation, for a given diffusion coefficient, the proportion of metal species released from plastic particles within a given time frame increases dramatically as the size of the particle decreases. The ensuing consequences for the chemodynamics and bioavailability of metal species associated with plastic micro- and nano-particles in aquatic systems are discussed and illustrated with practical examples.
Collapse
Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology, University of Antwerp, Antwerp, Belgium.,Physical Chemistry and Soft Matter, Wageningen University & Research, Wageningen, Netherlands
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter, Wageningen University & Research, Wageningen, Netherlands
| | - Ronny Blust
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology, University of Antwerp, Antwerp, Belgium
| |
Collapse
|
10
|
Yang G, Wilkinson KJ. Biouptake of a rare earth metal (Nd) by Chlamydomonas reinhardtii - Bioavailability of small organic complexes and role of hardness ions. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 243:263-269. [PMID: 30189390 DOI: 10.1016/j.envpol.2018.08.066] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/20/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
A green alga, Chlamydomonas reinhardtii, was used to verify whether a simple Biotic Ligand Model (BLM) could be used to predict carefully controlled short-term biouptake for the lanthanide, Nd. In the absence of ligands or competitors, Nd biouptake was well described by a Michaelis-Menten equation with an affinity constant, KNd, of 106.8 M-1 and a maximum internalization flux of Jmax = 1.70 × 10-14 mol cm-2 s-1. For bi-metal mixtures containing Nd and Ca, Mg, Sm or Eu, Nd uptake could also be well modelled by assigning experimentally determined affinity constants of KCa = 102.6 M-1, KMg = 103.4 M-1, KSm = 106.5 M-1 and KEu = 106.5 M-1. The similar values of Km and Jmax for the three rare earth elements (REEs): Sm, Eu and Nd is consistent with them sharing a common metal uptake site. On the other hand, in the presence of the small organic ligands (citric or malic acid), neither, free or total Nd concentrations could be used to quantitatively predict Nd internalization fluxes. In other words, in order to predict biouptake by simple BLM determinations, it was necessary to consider that the Nd complexes were bioavailable. The data strongly suggest that risk evaluations of the REE will require a new paradigm and new tools for evaluating bioavailability.
Collapse
Affiliation(s)
- Guang Yang
- College of Energy and Environmental Engineering, Hebei University of Engineering, Handan City, Hebei province, 056038, China; Department of Chemistry, Biophysical Environmental Chemistry Group, University of Montreal, C.P. 6128, Succursale Centre-ville, Montreal QC, H3C 3J7, Canada
| | - Kevin J Wilkinson
- Department of Chemistry, Biophysical Environmental Chemistry Group, University of Montreal, C.P. 6128, Succursale Centre-ville, Montreal QC, H3C 3J7, Canada.
| |
Collapse
|
11
|
Town RM, Duval JFL, van Leeuwen HP. The Intrinsic Stability of Metal Ion Complexes with Nanoparticulate Fulvic Acids. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:11682-11690. [PMID: 30226375 DOI: 10.1021/acs.est.8b02896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The electrostatic contributions to metal ion binding by fulvic acids (FAs) are characterized in light of recent theoretical developments on description of the net charge density of soft nanoparticles. Under practical electrolyte concentrations, the radius of the small, highly charged soft nanoparticulate FAs is comparable to the electrostatic screening length and their electric potential profile has a bell shape that extends into the surrounding aqueous medium. Consequently, accumulation of counterions in the extraparticulate zone can be significant. By comparison of experimentally derived Boltzmann partitioning coefficients with those computed on the basis of (i) the structural FA particle charge and (ii) the potential profile for a nanoparticulate FA entity equilibrated with indifferent electrolyte, we identify the thickness of the extraparticulate counter charge accumulation shell in 1-1 and 2-1 electrolytes. The results point to the involvement of counterion condensation phenomena and call into question the approaches for modeling electrostatic contributions to ion binding that are invoked by popular equilibrium speciation codes. Overall, the electrostatic contributions to Cdaq2+ and Cuaq2+ association with FA are weaker than those previously found for much larger humic acids (HA). The intrinsic chemical binding strength of CdFA is comparable to that of CdHA, whereas CuFA complexes are weaker than CuHA ones.
Collapse
Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology , University of Antwerp , Groenenborgerlaan 171 , 2020 Antwerp , Belgium
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
| | - Jérôme F L Duval
- CNRS , Laboratoire Interdisciplinaire des Environnements Continenteaux (LIEC) , UMR 7360, Vandoeuvre-lès-Nancy , F-54501 Nancy , France
- Université de Lorraine , LIEC, UMR 7360, Vandoeuvre-lès-Nancy , F-54501 Nancy , France
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter , Wageningen University & Research , Stippeneng 4 , 6708 WE Wageningen , The Netherlands
| |
Collapse
|
12
|
Combined Effects of Trace Metals and Light on Photosynthetic Microorganisms in Aquatic Environment. ENVIRONMENTS 2018. [DOI: 10.3390/environments5070081] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In the present review, we critically examine the state-of-the-art of the research on combined effects of trace metals and light on photosynthetic microorganisms in aquatic environment. Light of different intensity and spectral composition affects the interactions between trace metals and photosynthetic microorganisms directly, by affecting vital cellular functions and metal toxicokinetics and toxicodynamics, and indirectly, by changing ambient medium characteristics. Light radiation and in particular, the ultraviolet radiation component (UVR) alters the structure and reactivity of dissolved organic matter in natural water, which in most of the cases decreases its metal binding capacity and enhances metal bioavailability. The increase of cellular metal concentrations is generally associated with increasing light intensity, however further studies are necessary to better understand the underlying mechanisms. Studies on the combined exposures of photosynthetic microorganisms to metals and UVR reveal antagonistic, additive or synergistic interactions depending on light intensity, spectral composition or light pre-exposure history. Among the light spectrum components, most of the research was performed with UVR, while the knowledge on the role of high-intensity visible light and environmentally relevant solar light radiation is still limited. The extent of combined effects also depends on the exposure sequence and duration, as well as the species-specific sensitivity of the tested microorganisms and the activation of stress defense responses.
Collapse
|
13
|
Cuss CW, Grant-Weaver I, Shotyk W. AF4-ICPMS with the 300 Da Membrane To Resolve Metal-Bearing “Colloids” < 1 kDa: Optimization, Fractogram Deconvolution, and Advanced Quality Control. Anal Chem 2017; 89:8027-8035. [DOI: 10.1021/acs.analchem.7b01427] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chad W. Cuss
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G
2H1, Canada
| | - Iain Grant-Weaver
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G
2H1, Canada
| | - William Shotyk
- Department of Renewable Resources, University of Alberta, Edmonton, AB T6G
2H1, Canada
| |
Collapse
|
14
|
Town RM, Pinheiro JP, van Leeuwen HP. Chemodynamics of Soft Nanoparticulate Metal Complexes: From the Local Particle/Medium Interface to a Macroscopic Sensor Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:527-536. [PMID: 27989214 DOI: 10.1021/acs.langmuir.6b03381] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The lability of a complex species between a metal ion M and a binding site S, MS, is conventionally defined with respect to an ongoing process at a reactive interface, for example, the conversion or accumulation of the free metal ion M by a sensor. In the case of soft charged multisite nanoparticulate complexes, the chemodynamic features that are operative within the micro environment of the particle body generally differ substantially from those for dissolved similar single-site complexes in the same medium. Here we develop a conceptual framework for the chemodynamics and the ensuing lability of soft (3D) nanoparticulate metal complexes. The approach considers the dynamic features of MS at the intraparticulate level and their impact on the overall reactivity of free metal ions at the surface of a macroscopic sensing interface. Chemodynamics at the intraparticulate level is shown to involve a local reaction layer at the particle/medium interface, while at the macroscopic sensor level an operational reaction layer is invoked. Under a certain window of conditions, volume exclusion of the nanoparticle body near the medium/sensor interface is substantial and affects the properties of the reaction layer and the overall lability of the nanoparticulate MS complex toward the reactive surface.
Collapse
Affiliation(s)
- Raewyn M Town
- Systemic Physiological and Ecotoxicological Research (SPHERE), Department of Biology, University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium
- Physical Chemistry and Soft Matter, Wageningen University & Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - José Paulo Pinheiro
- Université de Lorraine , Laboratoire Interdisciplinaire des Environnements Continentaux, UMR 7360 CNRS, 15 avenue du Charmois, 54500 Vandoeuvre-les-Nancy, France
- Physical Chemistry and Soft Matter, Wageningen University & Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Herman P van Leeuwen
- Physical Chemistry and Soft Matter, Wageningen University & Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands
| |
Collapse
|
15
|
Duval JFL. Chemodynamics of metal ion complexation by charged nanoparticles: a dimensionless rationale for soft, core–shell and hard particle types. Phys Chem Chem Phys 2017; 19:11802-11815. [DOI: 10.1039/c7cp01750b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This study clarifies the contributions of nanoparticle properties and aqueous metal ion dehydration kinetics to chemodynamics of nanoparticulate metal complexes.
Collapse
Affiliation(s)
- Jérôme F. L. Duval
- CNRS
- Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC)
- UMR 7360
- Vandoeuvre-lès-Nancy F-54501
- France
| |
Collapse
|
16
|
Rotureau E, Waldvogel Y, Pinheiro JP, Farinha JPS, Bihannic I, Présent RM, Duval JFL. Structural effects of soft nanoparticulate ligands on trace metal complexation thermodynamics. Phys Chem Chem Phys 2016; 18:31711-31724. [PMID: 27841406 DOI: 10.1039/c6cp06880d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Metal binding to natural soft colloids is difficult to address due to the inherent heterogeneity of their reactive polyelectrolytic volume and the modifications of their shell structure following changes in e.g. solution pH, salinity or temperature. In this work, we investigate the impacts of temperature- and salinity-mediated modifications of the shell structure of polymeric ligand nanoparticles on the thermodynamics of divalent metal ions Cd(ii)-complexation. The adopted particles consist of a glassy core decorated by a fine-tunable poly(N-isopropylacrylamide) anionic corona. According to synthesis, the charges originating from the metal binding carboxylic moieties supported by the corona chains are located preferentially either in the vicinity of the core or at the outer shell periphery (p(MA-N) and p(N-AA) particles, respectively). Stability constants (KML) of cadmium-nanoparticle complexes are measured under different temperature and salinity conditions using electroanalytical techniques. The obtained KML is clearly impacted by the location of the carboxylic functional groups within the shell as p(MA-N) leads to stronger nanoparticulate Cd complexes than p(N-AA). The dependence of KML on solution salinity for p(N-AA) is shown to be consistent with a binding of Cd to peripheral carboxylic groups driven by Coulombic interactions (Eigen-Fuoss mechanism for ions-pairing) or with particle electrostatic features operating at the edge of the shell Donnan volume. For p(MA-N) particulate ligands, a scenario where metal binding occurs within the intraparticulate Donnan phase correctly reproduces the experimental findings. Careful analysis of electroanalytical data further evidences that complexation of metal ions by core-shell particles significantly differ according to the location and distribution of the metal-binding sites throughout the reactive shell. This complexation heterogeneity is basically enhanced with increasing temperature i.e. upon significant increase of particle shell shrinking, which suggests that the contraction of the reactive phase volume of the particulate ligands promotes cooperative metal binding effects.
Collapse
Affiliation(s)
- Elise Rotureau
- CNRS, LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux), UMR 7360, Vandoeuvre-lès-Nancy F-54501, France and Université de Lorraine, LIEC, UMR 7360, Vandoeuvre-lès-Nancy F-54501, France.
| | - Yves Waldvogel
- CNRS, LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux), UMR 7360, Vandoeuvre-lès-Nancy F-54501, France and Université de Lorraine, LIEC, UMR 7360, Vandoeuvre-lès-Nancy F-54501, France.
| | - José P Pinheiro
- CNRS, LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux), UMR 7360, Vandoeuvre-lès-Nancy F-54501, France and Université de Lorraine, LIEC, UMR 7360, Vandoeuvre-lès-Nancy F-54501, France.
| | - José Paulo S Farinha
- Centro de Quimica Fisica Molecular and IN-Institute of Nanoscience and Nanotechnology, Instituto Superior Tecnico, University of Lisbon, 1049-001 Lisboa, Portugal
| | - Isabelle Bihannic
- CNRS, LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux), UMR 7360, Vandoeuvre-lès-Nancy F-54501, France and Université de Lorraine, LIEC, UMR 7360, Vandoeuvre-lès-Nancy F-54501, France.
| | - Romain M Présent
- CNRS, LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux), UMR 7360, Vandoeuvre-lès-Nancy F-54501, France and Université de Lorraine, LIEC, UMR 7360, Vandoeuvre-lès-Nancy F-54501, France.
| | - Jérôme F L Duval
- CNRS, LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux), UMR 7360, Vandoeuvre-lès-Nancy F-54501, France and Université de Lorraine, LIEC, UMR 7360, Vandoeuvre-lès-Nancy F-54501, France.
| |
Collapse
|
17
|
Town RM, van Leeuwen HP. Intraparticulate Metal Speciation Analysis of Soft Complexing Nanoparticles. The Intrinsic Chemical Heterogeneity of Metal–Humic Acid Complexes. J Phys Chem A 2016; 120:8637-8644. [DOI: 10.1021/acs.jpca.6b08543] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Raewyn M. Town
- Department
of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark
- Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Systemic Physiological and Ecotoxicological
Research (SPHERE), Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Herman P. van Leeuwen
- Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| |
Collapse
|
18
|
Shi Z, Wang P, Peng L, Lin Z, Dang Z. Kinetics of Heavy Metal Dissociation from Natural Organic Matter: Roles of the Carboxylic and Phenolic Sites. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:10476-10484. [PMID: 27580051 DOI: 10.1021/acs.est.6b01809] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We developed a unifying model for the kinetics of heavy metal dissociation from natural organic matter (NOM) in this study. The kinetics model, integrated with the equilibrium model WHAM 7, specifically considered metal ion reactions with various NOM sites formed by the carboxylic and phenolic sites. The association and dissociation rate coefficients for metal reactions with various NOM sites were constrained by WHAM predicted equilibrium distribution coefficients at specific reaction conditions. We developed the relationship for the dissociation rate coefficients among different binding sites for each metal, which was internally constrained by the metal binding constants. The model had only one fitting parameter, the dissociation rate coefficient for the metal complexes formed with two weak carboxylic sites, and all other parameters were derived from WHAM 7. The kinetic data for metal dissociation from NOM were collected from the literature, and the model was able to reproduce most of relevant data analyzed. The bidentate complexes appeared to be the predominated species controlling metal dissociation under most environmental conditions. The model can help to predict the reactivity and bioavailability of heavy metals under the impact of multiple competing ligands including NOM.
Collapse
Affiliation(s)
- Zhenqing Shi
- School of Environment and Energy, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
| | - Pei Wang
- School of Environment and Energy, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
| | - Lanfang Peng
- School of Environment and Energy, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
| | - Zhang Lin
- School of Environment and Energy, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology , Guangzhou, Guangdong 510006, People's Republic of China
| |
Collapse
|
19
|
Lability of nanoparticulate metal complexes in electrochemical speciation analysis. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3372-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
20
|
Duval JFL, Présent RM, Rotureau E. Kinetic and thermodynamic determinants of trace metal partitioning at biointerphases: the role of intracellular speciation dynamics. Phys Chem Chem Phys 2016; 18:30415-30435. [DOI: 10.1039/c6cp05717a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A theory is elaborated for rationalizing the impacts of intracellular metal speciation dynamics on metal uptake in suspension of charged microorganisms beyond the classical thermodynamic representation.
Collapse
Affiliation(s)
- Jérôme F. L. Duval
- CNRS
- Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC)
- UMR 7360
- Vandoeuvre-lès-Nancy F-54501
- France
| | - Romain M. Présent
- CNRS
- Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC)
- UMR 7360
- Vandoeuvre-lès-Nancy F-54501
- France
| | - Elise Rotureau
- CNRS
- Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC)
- UMR 7360
- Vandoeuvre-lès-Nancy F-54501
- France
| |
Collapse
|
21
|
Town RM, van Leeuwen HP. Metal ion–humic acid nanoparticle interactions: role of both complexation and condensation mechanisms. Phys Chem Chem Phys 2016; 18:18024-32. [DOI: 10.1039/c6cp02634f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A counterion condensation – Donnan electrostatic model provides a physicochemically consistent description of intraparticulate metal species distributions in humic acid nanoparticles.
Collapse
Affiliation(s)
- Raewyn M. Town
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- 5230 Odense
- Denmark
| | - Herman P. van Leeuwen
- Physical Chemistry and Soft Matter
- Wageningen University & Research
- 6708 WE Wageningen
- The Netherlands
| |
Collapse
|
22
|
Duval JFL. Coupled metal partitioning dynamics and toxicodynamics at biointerfaces: a theory beyond the biotic ligand model framework. Phys Chem Chem Phys 2016; 18:9453-69. [DOI: 10.1039/c5cp07780j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A theory is developed for coupled toxicodynamics and interfacial metal partitioning dynamics, with integration of intertwined metal adsorption–internalisation–excretion-transport at the biointerface, cell growth and metal depletion from solution.
Collapse
Affiliation(s)
- Jérôme F. L. Duval
- CNRS
- LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux)
- UMR7360
- Vandoeuvre-lès-Nancy F-54501
- France
| |
Collapse
|
23
|
Town RM, van Leeuwen HP. Intraparticulate speciation analysis of soft nanoparticulate metal complexes. The impact of electric condensation on the binding of Cd2+/Pb2+/Cu2+by humic acids. Phys Chem Chem Phys 2016; 18:10049-58. [DOI: 10.1039/c6cp01229a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The drastic role of electrostatics in the binding of metal ions by soft charged nanoparticulate humic acid complexants is demonstrated.
Collapse
Affiliation(s)
- Raewyn M. Town
- Department of Physics
- Chemistry and Pharmacy
- University of Southern Denmark
- 5230 Odense
- Denmark
| | - Herman P. van Leeuwen
- Laboratory of Physical Chemistry and Colloid Science
- Wageningen University
- 6703 HB Wageningen
- The Netherlands
| |
Collapse
|
24
|
|
25
|
Yasadi K, Pinheiro JP, Zielińska K, Town RM, van Leeuwen HP. Partitioning of humic acids between aqueous solution and hydrogel. 3. Microelectrodic dynamic speciation analysis of free and bound humic metal complexes in the gel phase. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1737-1745. [PMID: 25580682 DOI: 10.1021/la504885v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The hydrogel/water partitioning of the various species in the cadmium(II)/soil humic acid (HA) system is studied for two types of gel, using in situ microelectrodic voltammetry. Under the conditions of this work, with HA particles of ca. 25 and 125 nm radius, the CdHA complex is shown to be close to nonlabile toward a 12.5 μm radius microelectrode. This implies that its kinetic contribution to Cd(2+) reduction at the medium/microelectrode interface is practically negligible. The polyacrylamide (PAAm) gels equilibrate with the aqueous medium under significant sorption of HA at the gel backbone/gel medium interface, which in turn leads to induced sorption of Cd(II) in the form of immobilized gel-bound CdHA. The rather high total Cd content of the PAAm gel suggests that the binding of Cd(2+) by the hydrophobically gel-bound HA is stronger than that for dispersed HA particles. Still, the intraparticulate speciation of Cd(II) over Cd(2+) and CdHA corresponds to an intrinsic stability constant similar to that for simple monocarboxylate ligands such as acetate. Alginate gels are negatively charged, and their free [Cd(aq)(2+)] is higher than that in the medium by the corresponding Donnan coefficient. On top of that, Cd(2+) is specifically sorbed by the gel backbone/gel medium interface to reach accumulation factors as high as a few tens. HA and CdHA accumulate in the outer 20 μm film of gel at the gel/water interface of both gels, but they do not penetrate into the bulk of the alginate gel. Overall, the gel/water interface dictates drastic changes in the speciation of Cd/HA as compared to the aqueous medium, with distinct features for each individual type of gel. The results have broad significance, for example, for predictions of reactivity and bioavailability of metal species which inherently involve partitioning and diffusion into diverse gel layers such as biointerfacial cell walls, biofilm matrices, and mucous membranes.
Collapse
Affiliation(s)
- Kamuran Yasadi
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University , Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | | | | | | | | |
Collapse
|
26
|
Pera H, Nolte TM, Leermakers FAM, Kleijn JM. Coverage and disruption of phospholipid membranes by oxide nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:14581-14590. [PMID: 25390582 DOI: 10.1021/la503413w] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We studied the interactions of silica and titanium dioxide nanoparticles with phospholipid membranes and show how electrostatics plays an important role. For this, we systematically varied the charge density of both the membranes by changing their lipid composition and the oxide particles by changing the pH. For the silica nanoparticles, results from our recently presented fluorescence vesicle leakage assay are combined with data on particle adsorption onto supported lipid bilayers obtained by optical reflectometry. Because of the strong tendency of the TiO2 nanoparticles to aggregate, the interaction of these particles with the bilayer was studied only in the leakage assay. Self-consistent field (SCF) modeling was applied to interpret the results on a molecular level. At low charge densities of either the silica nanoparticles or the lipid bilayers, no electrostatic barrier to adsorption exists. However, the adsorption rate and adsorbed amounts drop with increasing (negative) charge densities on particles and membranes because of electric double-layer repulsion, which is confirmed by the effect of the ionic strength. SCF calculations show that charged particles change the structure of lipid bilayers by a reorientation of a fraction of the zwitterionic phosphatidylcholine (PC) headgroups. This explains the affinity of the silica particles for pure PC lipid layers, even at relatively high particle charge densities. Particle adsorption does not always lead to the disruption of the membrane integrity, as is clear from a comparison of the leakage and adsorption data for the silica particles. The attraction should be strong enough, and in line with this, we found that for positively charged TiO2 particles vesicle disruption increases with increasing negative charge density on the membranes. Our results may be extrapolated to a broader range of oxide nanoparticles and ultimately may be used for establishing more accurate nanoparticle toxicity assessments and drug-delivery systems.
Collapse
Affiliation(s)
- Harke Pera
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University , Dreijenplein 6, 6307 HB Wageningen, The Netherlands
| | | | | | | |
Collapse
|
27
|
Duffner A, Weng L, Hoffland E, van der Zee SEATM. Multi-surface modeling to predict free zinc ion concentrations in low-zinc soils. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:5700-8. [PMID: 24742258 DOI: 10.1021/es500257e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Multi-surface models are widely used to assess the potential ecotoxicological risk in metal-contaminated soils. Their accuracy in predicting metal speciation in soils with low metal levels was not yet tested. Now highly sensitive analytical techniques are available to experimentally validate such models at low concentration levels. The objective of this study was to test the accuracy of a multi-surface model to predict the Zn(2+) concentration and to improve our understanding of Zn bioavailability in low-Zn soils. High-Zn soils were included as controls. Model parameters were determined independently on the basis of earlier peer-reviewed publications. Model output was validated against free Zn(2+) concentrations determined with the soil column Donnan membrane technique in a range of soils varying in potentially available Zn, organic matter, clay silicate, and iron (hydr)oxide contents and pH. Deviations between predicted Zn(2+) concentrations and experimentally determined values over the whole Zn concentration range were less or equal to the experimental standard error, except for one low-Zn soil. The Zn(2+) concentration was mainly controlled by adsorption, where organic matter was predicted to be the dominant soil sorbent. The predicted Zn(2+) concentration depends more sensitively upon changes of the reactive Zn pool (application of 0.6, 1.2, 2.4, and 3.6 mg of Zn kg(-1) of soil) and organic matter content (± 0.2 and 0.4%) than pH changes (± 0.5 and 1 pH unit).
Collapse
Affiliation(s)
- Andreas Duffner
- Department of Soil Quality, and ‡Soil Physics and Land Management Group, Wageningen University , 6708 PB Wageningen, Netherlands
| | | | | | | |
Collapse
|
28
|
Simpson SL, Vardanega CR, Jarolimek C, Jolley DF, Angel BM, Mosley LM. Metal speciation and potential bioavailability changes during discharge and neutralisation of acidic drainage water. CHEMOSPHERE 2014; 103:172-180. [PMID: 24359925 DOI: 10.1016/j.chemosphere.2013.11.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 11/21/2013] [Accepted: 11/22/2013] [Indexed: 06/03/2023]
Abstract
The discharge of acid drainage from the farm irrigation areas to the Murray River in South Australia represents a potential risk to water quality. The drainage waters have low pH (2.9-5.7), high acidity (up to 1190 mg L(-1) CaCO3), high dissolved organic carbon (10-40 mg L(-1)), and high dissolved Al, Co, Ni and Zn (up to 55, 1.25, 1.30 and 1.10 mg L(-1), respectively) that represent the greatest concern relative to water quality guidelines (WQGs). To provide information on bioavailability, changes in metal speciation were assessed during mixing experiments using filtration (colloidal metals) and Chelex-lability (free metal ions and weak inorganic metal complexes) methods. Following mixing of drainage and river water, much of the dissolved aluminium and iron precipitated. The concentrations of other metals generally decreased conservatively in proportion to the dilution initially, but longer mixing periods caused increased precipitation or adsorption to particulate phases. Dissolved Co, Mn and Zn were typically 95-100% present in Chelex-labile forms, whereas 40-70% of the dissolved nickel was Chelex-labile and the remaining non-labile fraction of dissolved nickel was associated with fine colloids or complexed by organic ligands that increased with time. Despite the different kinetics of precipitation, adsorption and complexation reactions, the dissolved metal concentrations were generally highly correlated for the pooled data sets, indicating that the major factors controlling the concentrations were similar for each metal (pH, dilution, and time following mixing). For dilutions of the drainage waters of less than 1% with Murray River water, none of the metals should exceed the WQGs. However, the high concentrations of metals associated with fine precipitates within the receiving waters may represent a risk to some aquatic organisms.
Collapse
Affiliation(s)
- Stuart L Simpson
- Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia.
| | - Christopher R Vardanega
- Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia; School of Chemistry, University of Wollongong, New South Wales, Australia
| | - Chad Jarolimek
- Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia
| | - Dianne F Jolley
- School of Chemistry, University of Wollongong, New South Wales, Australia
| | - Brad M Angel
- Centre for Environmental Contaminants Research, CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia
| | - Luke M Mosley
- Environment Protection Authority South Australia, GPO Box 2607, Adelaide, SA 5001, Australia
| |
Collapse
|
29
|
Polyakov PD, Duval JFL. Speciation dynamics of metals in dispersion of nanoparticles with discrete distribution of charged binding sites. Phys Chem Chem Phys 2014; 16:1999-2010. [DOI: 10.1039/c3cp54659d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
30
|
Duval JFL, Rotureau E. Dynamics of metal uptake by charged soft biointerphases: impacts of depletion, internalisation, adsorption and excretion. Phys Chem Chem Phys 2014; 16:7401-16. [DOI: 10.1039/c4cp00210e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A formalism is elaborated for deriving the dynamic partitioning of metal ions across an active, charged soft biointerphase with full account of metal depletion, transport, internalisation, adsorption and excretion processes.
Collapse
Affiliation(s)
- Jérôme F. L. Duval
- CNRS
- LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux)
- UMR7360
- Vandoeuvre-lès-Nancy F-54501, France
- Université de Lorraine
| | - Elise Rotureau
- CNRS
- LIEC (Laboratoire Interdisciplinaire des Environnements Continentaux)
- UMR7360
- Vandoeuvre-lès-Nancy F-54501, France
- Université de Lorraine
| |
Collapse
|
31
|
Duval JFL, Farinha JPS, Pinheiro JP. Impact of electrostatics on the chemodynamics of highly charged metal-polymer nanoparticle complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13821-13835. [PMID: 24117349 DOI: 10.1021/la403106m] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this work, the impact of electrostatics on the stability constant, the rate of association/dissociation, and the lability of complexes formed between Cd(II), Pb(II), and carboxyl-modified polymer nanoparticles (also known as latex particles) of radius ∼ 50 nm is systematically investigated via electroanalytical measurements over a wide range of pHs and NaNO3 electrolyte concentrations. The corresponding interfacial structure and key electrostatic properties of the particles are independently derived from their electrokinetic response, successfully interpreted using soft particle electrohydrodynamic formalism, and complemented by Förster resonance energy transfer (FRET) analysis. The results underpin the presence of an ∼0.7-1 nm thick permeable and highly charged shell layer at the surface of the polymer nanoparticles. Their electrophoretic mobility further exhibits a minimum versus NaNO3 concentration due to strong polarization of the electric double layer. Integrating these structural and electrostatic particle features with recent theory on chemodynamics of particulate metal complexes yields a remarkable recovery of the measured increase in complex stability with increasing pH and/or decreasing solution salinity. In the case of the strongly binding Pb(II), the discrepancy at pH > 5.5 is unambiguously assigned to the formation of multidendate complexes with carboxylate groups located in the particle shell. With increasing pH and/or decreasing electrolyte concentration, the theory further predicts a kinetically controlled formation of metal complexes and a dramatic loss of their lability (especially for lead) on the time-scale of diffusion toward a macroscopic reactive electrode surface. These theoretical findings are again shown to be in agreement with experimental evidence.
Collapse
Affiliation(s)
- Jérôme F L Duval
- Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), Université de Lorraine , UMR 7360, 15 avenue du Charmois, Vandœuvre-lès-Nancy, F-54501, France
| | | | | |
Collapse
|
32
|
Hammes J, Gallego-Urrea JA, Hassellöv M. Geographically distributed classification of surface water chemical parameters influencing fate and behavior of nanoparticles and colloid facilitated contaminant transport. WATER RESEARCH 2013; 47:5350-5361. [PMID: 23863373 DOI: 10.1016/j.watres.2013.06.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 05/07/2013] [Accepted: 06/07/2013] [Indexed: 06/02/2023]
Abstract
The current production and use of nanomaterials in consumer products have increased the concern about the possibility that these enter the rivers during their entire life cycle. Further, many aquatic contaminants undergo partitioning to the ubiquitous aquatic colloids. Here is presented the development of a set of European water types for environmental risk assessment of chemicals transported as nanovectors as is the case of environmental fate of manufactured nanoparticles and colloid-bound contaminants. A compilation of river quality geochemical data with information about multi-element composition for near 800 rivers in Europe was used to perform a principal component analysis (PCA) and define 6 contrasting water classes. With the aid of geographical information system algorithms, it was possible to analyse how the different sampling locations were predominantly represented within each European water framework directive drainage basin. These water classes and their associated Debye-Hückel parameter are determining factors to evaluate the large scale fate and behaviour of nanomaterials and other colloid-transported pollutants in the European aquatic environment.
Collapse
Affiliation(s)
- Julia Hammes
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 4, 412 96 Gothenburg, Sweden
| | | | | |
Collapse
|
33
|
Town RM, Buffle J, Duval JFL, van Leeuwen HP. Chemodynamics of Soft Charged Nanoparticles in Aquatic Media: Fundamental Concepts. J Phys Chem A 2013; 117:7643-54. [DOI: 10.1021/jp4044368] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raewyn M. Town
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej
55, 5230 Odense, Denmark
| | - Jacques Buffle
- CABE, Section de Chimie et Biochimie, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, CH-1211
Geneva 4, Switzerland
| | - Jérôme F. L. Duval
- Université de Lorraine and CNRS, LIEC (Laboratoire
Interdisciplinaire des Environnements Continentaux), UMR 7360, 15
avenue du Charmois, Vandoeuvre-lès-Nancy, F-54501 France
| | - Herman P. van Leeuwen
- Laboratory of Physical Chemistry
and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| |
Collapse
|
34
|
Vega FA, Weng L. Speciation of heavy metals in River Rhine. WATER RESEARCH 2013; 47:363-372. [PMID: 23127623 DOI: 10.1016/j.watres.2012.10.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2012] [Revised: 09/10/2012] [Accepted: 10/07/2012] [Indexed: 06/01/2023]
Abstract
Chemical speciation of Zn, Cu, Ni, Cd and Pb in River Rhine was studied by measuring free ion concentration and distribution in nanoparticles, and by comparing the measurement with speciation modeling. Concentrations of free metal ions were determined in situ using Donnan Membrane Technique (DMT). The percentage of free over total (filtered) metal concentration is 52%, 33%, 2.6%, 0.48% and 0.12% for respectively Zn, Cd, Ni, Pb and Cu, i.e. the degree of metal complexation in the river is the lowest for Zn and the highest for Cu. Metals in 1-300 nm particles were analyzed using Asymmetric Flow Field Flow Fractionation (AsF-FFF), but the overall recovery is quite low. The nano-sized Cu detected is mainly associated with DOM of 1-5 nm, whereas Pb and Zn are dominantly associated with particles of iron hydroxides and clay of larger size (30-100 nm). Free ion concentrations calculated with the speciation modeling are in good agreement with the measurements, except for Pb. Based on the model, DOM-bound is the most important complexed form for Cu and Cd, whereas formation of (bi)carbonate and EDTA complexes are more important for Ni and Zn. Adsorption of Pb to DOM is probably overestimated by the model, whereas Pb adsorption to iron hydroxides is underestimated.
Collapse
Affiliation(s)
- Flora A Vega
- Department of Soil Quality, Wageningen University, Wageningen, The Netherlands
| | | |
Collapse
|
35
|
Zielińska K, van Leeuwen HP, Thibault S, Town RM. Speciation analysis of aqueous nanoparticulate diclofenac complexes by solid-phase microextraction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:14672-14680. [PMID: 22989313 DOI: 10.1021/la303143w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The dynamic sorption of an organic compound by nanoparticles (NPs) is analyzed by solid-phase microextraction (SPME) for the example case of the pharmaceutical diclofenac in dispersions of impermeable (silica, SiO(2)) and permeable (bovine serum albumin, BSA) NPs. It is shown that only the protonated neutral form of diclofenac is accumulated in the solid phase, and hence this species governs the eventual partition equilibrium. On the other hand, the rate of the solid/water partition equilibration is enhanced in the presence of the sorbing nanoparticles of SiO(2) and BSA. This feature demonstrates that the NPs themselves do not enter the solid phase to any appreciable extent. The enhanced rate of attainment of equilibrium is due to a shuttle-type of contribution from the NP-species to the diffusive supply of diclofenac to the water/solid interface. For both types of nanoparticulate complexes, the rate constant for desorption (k(des)) of bound diclofenac was derived from the measured thermodynamic affinity constant and a diffusion-limited rate of adsorption. The computed k(des) values were found to be sufficiently high to render the NP-bound species labile on the effective time scale of SPME. In agreement with theoretical prediction, the experimental results are quantitatively described by fully labile behavior of the diclofenac/nanoparticle system and an ensuing accumulation rate controlled by the coupled diffusion of neutral, deprotonated, and NP-bound diclofenac species.
Collapse
Affiliation(s)
- Katarzyna Zielińska
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | | | | | | |
Collapse
|
36
|
Town RM, van Leeuwen HP, Buffle J. Chemodynamics of soft nanoparticulate complexes: Cu(II) and Ni(II) complexes with fulvic acids and aquatic humic acids. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:10487-10498. [PMID: 22934531 DOI: 10.1021/es3018013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The dynamics of metal complexation by small humic substances (fulvic acid and aquatic humic acid, collectively denoted as “fulvic-like substance”, FS) are explored within the framework of concepts recently developed for soft nanoparticulate complexants. From a comprehensive collection of published equilibrium and dissociation rate constants for CuFS and NiFS complexes, the association rate constant, ka, is determined as a function of the degree of complexing site occupation, θ. From this large data set, it is shown for the first time that ka is independent of θ. This result has important consequences for finding the nature of the rate limiting step in the association process. The influence of electric effects on the rate of the association process is described, namely (i) the accelerating effect of the negatively charged electrostatic field of FS on the diffusion of metal ions toward it, and (ii) the extent to which metal ions electrostatically accumulate in the counterionic atmosphere of FS. These processes are discussed qualitatively in relation to the derived values of ka. For slowly dehydrating metal ions such as Ni(H2O)6 2+ (dehydration rate constant, kw), ka is expected to derive straight from kw. In contrast, for rapidly dehydrating metal ions such as Cu(H2O)6 2+, transport limitations and electric effects involved in the formation of the precursor outer-sphere associate appear to be important overall rate-limiting factors. This is of great significance for understanding the chemodynamics of humic complexes in the sense that inner-sphere complex formation would not always be the (sole) rate limiting step.
Collapse
Affiliation(s)
- Raewyn M Town
- Institute of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense, Denmark.
| | | | | |
Collapse
|
37
|
French S, Puddephatt D, Habash M, Glasauer S. The dynamic nature of bacterial surfaces: Implications for metal–membrane interaction. Crit Rev Microbiol 2012; 39:196-217. [DOI: 10.3109/1040841x.2012.702098] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
38
|
Pham AN, Rose AL, Waite TD. Kinetics of Cu(II) Reduction by Natural Organic Matter. J Phys Chem A 2012; 116:6590-9. [DOI: 10.1021/jp300995h] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- A. Ninh Pham
- School of Civil and Environmental
Engineering, The University of New South Wales, Sydney, NSW, Australia 2052
| | - Andrew L. Rose
- Southern Cross GeoScience, Southern Cross University, Lismore, NSW 2480, Australia
| | - T. David Waite
- School of Civil and Environmental
Engineering, The University of New South Wales, Sydney, NSW, Australia 2052
| |
Collapse
|
39
|
Mota AM, Pinheiro JP, Simões Gonçalves ML. Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects. J Phys Chem A 2012; 116:6433-42. [DOI: 10.1021/jp2124636] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. M. Mota
- CQE, Instituto
Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001
Lisboa, Portugal
| | - J. P. Pinheiro
- IBB/CBME, Department
of Chemistry and Pharmacy, Faculty of Sciences and Technology, University of Algarve, 8005-139 Faro, Portugal
| | - M. L. Simões Gonçalves
- CQE, Instituto
Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001
Lisboa, Portugal
| |
Collapse
|
40
|
Town RM, Duval JFL, Buffle J, van Leeuwen HP. Chemodynamics of metal complexation by natural soft colloids: Cu(II) binding by humic acid. J Phys Chem A 2012; 116:6489-96. [PMID: 22324832 DOI: 10.1021/jp212226j] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The chemodynamics of Cu(II) complexation by humic acid is interpreted in terms of recently developed theory for permeable charged nanoparticles. Two opposing electric effects are operational with respect to the overall rate of association, namely, (i) the conductive enhancement of the diffusion of Cu(2+), expressed by a coefficient f(el), which accounts for the accelerating effect of the negative electrostatic field of the humic particle on the diffusive transport of metal ions toward it, and (ii) the ionic Boltzmann equilibration with the bulk solution, expressed by a factor f(B), which quantifies the extent to which Cu(2+) ions accumulate in the negatively charged particle body. These effects are combined in the probability of outer-sphere metal-site complex formation and the covalent binding of the metal ion by the complexing site (inner-sphere complex formation) as in the classical Eigen mechanism. Overall "experimental" rate constants for CuHA complex formation, k(a), are derived from measurements of the thermodynamic stability constant, K*, and the dissociation rate constant, k(d)*, as a function of the degree of metal ion complexation, θ. The resulting k(a) values are found to be practically independent of θ. They are also compared to theoretical values; at an ionic strength of 0.1 mol dm(-3), the rate of diffusive supply of metal ions toward the particles is comparable to the rate of inner-sphere complex formation, indicating that both processes are significant for the observed overall rate. As the ionic strength decreases, the rate of diffusive supply becomes the predominant rate-limiting process, in contrast with the general assumption made for complexes with small ligands that inner-sphere dehydration is the rate-limiting step. The results presented herein also resolve the discrepancy between experimentally observed and predicted dissociation rate constants based on the above assumption.
Collapse
Affiliation(s)
- Raewyn M Town
- Institute for Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense, Denmark
| | | | | | | |
Collapse
|
41
|
Ramus K, Kopinke FD, Georgi A. Sorption-induced effects of humic substances on mass transfer of organic pollutants through aqueous diffusion boundary layers: the example of water/air exchange. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:2196-2203. [PMID: 22268690 DOI: 10.1021/es2038382] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This study examines the effect of dissolved humic substances (DHS) on the rate of water-gas exchange of organic compounds under conditions where diffusion through the aqueous boundary layer is rate-determining. A synthetic surfactant was applied for comparison. Mass-transfer coefficients were determined from the rate of depletion of the model compounds by means of an apparatus containing a stirred aqueous solution with continuous purging of the headspace above the solution. In addition, experiments with continuous passive dosing of analytes into the water phase were conducted to simulate a system where thermodynamic activity of the chemical in the aqueous phase is identical in the presence and absence of DHS. The experimental results show that DHS and surfactants can affect water-gas exchange rates by the superposition of two mechanisms: (1) hydrodynamic effects due to surface film formation ("surface smoothing"), and (2) sorption-induced effects. Whether sorption accelerates or retards mass transfer depends on its effect on the thermodynamic activity of the pollutant in the aqueous phase. Mass transfer will be retarded if the activity (or freely dissolved concentration) of the pollutant is decreased due to sorption. If it remains unchanged (e.g., due to fast equilibration with a sediment acting as a large source phase), then DHS and surfactant micelles can act as an additional shuttle for the pollutants, enhancing the flux through the boundary layer.
Collapse
Affiliation(s)
- Ksenia Ramus
- Department of Environmental Engineering, Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, D-04318 Leipzig, Germany
| | | | | |
Collapse
|
42
|
van Leeuwen HP, Buffle J, Town RM. Electric relaxation processes in chemodynamics of aqueous metal complexes: from simple ligands to soft nanoparticulate complexants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:227-234. [PMID: 22126743 DOI: 10.1021/la203602y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The chemodynamics of metal complexes with nanoparticulate complexants can differ significantly from that for simple ligands. The spatial confinement of charged sites and binding sites to the nanoparticulate body impacts on the time scales of various steps in the overall complex formation process. The greater the charge carried by the nanoparticle, the longer it takes to set up the counterion distribution equilibrium with the medium. A z+ metal ion (z > 1) in a 1:1 background electrolyte will accumulate in the counterionic atmosphere around negatively charged simple ions, as well as within/around the body of a soft nanoparticle with negative structural charge. The rate of accumulation is often governed by diffusion and proceeds until Boltzmann partition equilibrium between the charged entity and the ions in the medium is attained. The electrostatic accumulation proceeds simultaneously with outer-sphere and inner-sphere complex formation. The rate of the eventual inner-sphere complex formation is generally controlled by the rate constant of dehydration of the metal ion, k(w). For common transition metal ions with moderate to fast dehydration rates, e.g., Cu(2+), Pb(2+), and Cd(2+), it is shown that the ionic equilibration with the medium may be the slower step and thus rate-limiting in their overall complexation with nanoparticles.
Collapse
Affiliation(s)
- Herman P van Leeuwen
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | | | | |
Collapse
|
43
|
Merlin J, Duval JFL. Metal speciation in a complexing soft film layer: a theoretical dielectric relaxation study of coupled chemodynamic and electrodynamic interfacial processes. Phys Chem Chem Phys 2012; 14:4491-504. [DOI: 10.1039/c2cp23611g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
44
|
Duval JFL, van Leeuwen HP. Rates of Ionic Reactions With Charged Nanoparticles In Aqueous Media. J Phys Chem A 2011; 116:6443-51. [DOI: 10.1021/jp209488v] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jérôme F. L. Duval
- Laboratoire Environnement et Minéralurgie, Nancy-University, CNRS UMR 7569, 15 avenue du Charmois, B.P. 40, 54501 Vandoeuvre-lès-Nancy Cedex, France
| | - Herman P. van Leeuwen
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| |
Collapse
|
45
|
Schaller J, Brackhage C, Mkandawire M, Dudel EG. Metal/metalloid accumulation/remobilization during aquatic litter decomposition in freshwater: a review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2011; 409:4891-4898. [PMID: 21907393 DOI: 10.1016/j.scitotenv.2011.08.006] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 08/03/2011] [Accepted: 08/03/2011] [Indexed: 05/31/2023]
Abstract
The focus of this article is to combine two main areas of research activities in freshwater ecosystems: the effect of inorganic pollutants on freshwater ecosystems and litter decomposition as a fundamental ecological process in streams. The decomposition of plant litter in aquatic systems as a main energy source in running water ecosystems proceeds in three distinct temporal stages of leaching, conditioning and fragmentation. During these stages metals and metalloids may be fixed by litter, its decay products and the associated organisms. The global-scale problem of contaminated freshwater ecosystems by metals and metalloids has led to many investigations on the acute and chronic toxicity of these elements to plants and animals as well as the impact on animal activity under laboratory conditions. Where sorption properties and accumulation/remobilization potential of metals in sediments and attached microorganisms are quite well understood, the combination of both research areas concerning the impact of higher trophic levels on the modification of sediment sorption conditions and the influence of metal/metalloid pollution on decomposition of plant litter mediated by decomposer community, as well as the effect of high metal load during litter decay on organism health under field conditions, has still to be elucidated. So far it was found that microbes and invertebrate shredder (species of the genera Gammarus and Asellus) have a significant influence on metal fixation on litter. Not many studies focus on the impact of other functional groups affecting litter decay (e.g. grazer and collectors) or other main processes in freshwater ecosystems like bioturbation (e.g. Tubifex, Chironomus) on metal fixation/release.
Collapse
Affiliation(s)
- Jörg Schaller
- Dresden University of Technology, D-01062, Dresden, Germany.
| | | | | | | |
Collapse
|
46
|
Smith KEC, Thullner M, Wick LY, Harms H. Dissolved organic carbon enhances the mass transfer of hydrophobic organic compounds from nonaqueous phase liquids (NAPLs) into the aqueous phase. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:8741-8747. [PMID: 21879725 DOI: 10.1021/es202983k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The hypothesis that dissolved organic carbon (DOC) enhances the mass transfer of hydrophobic organic compounds from nonaqueous phase liquids (NAPLs) into the aqueous phase above that attributable to dissolved molecular diffusion alone was tested. In controlled experiments, mass transfer rates of five NAPL-phase PAHs (log K(OW) 4.15-5.39) into the aqueous phase containing different concentrations of DOC were measured. Mass transfer rates were increased by up to a factor of 4 in the presence of DOC, with the greatest enhancement being observed for more hydrophobic compounds and highest DOC concentrations. These increases could not be explained by dissolved molecular diffusion alone, and point to a parallel DOC-mediated diffusive pathway. The nature of the DOC-mediated diffusion pathway as a function of the DOC concentration and PAH sorption behavior to the DOC was investigated using diffusion-based models. The DOC-enhanced mass transfer of NAPL-phase hydrophobic compounds into the aqueous phase has important implications for their bioremediation as well as bioconcentration and toxicity.
Collapse
Affiliation(s)
- Kilian E C Smith
- UFZ Helmholtz Centre for Environmental Research, Department of Environmental Microbiology, Leipzig, Germany.
| | | | | | | |
Collapse
|
47
|
Goveia D, Pinheiro JP, Milkova V, Rosa AH, van Leeuwen HP. Dynamics and heterogeneity of Pb(II) binding by SiO2 nanoparticles in an aqueous dispersion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7877-7883. [PMID: 21612251 DOI: 10.1021/la2008182] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Pb(II) binding by SiO(2) nanoparticles in an aqueous dispersion was investigated under conditions where the concentrations of Pb(2+) ions and nanoparticles are of similar magnitude. Conditional stability constants (log K) obtained at different values of pH and ionic strength varied from 4.4 at pH 5.5 and I = 0.1 M to 6.4 at pH 6.5 and I = 0.0015 M. In the range of metal to nanoparticle ratios from 1.6 to 0.3, log K strongly increases, which is shown to be due to heterogeneity in Pb(II) binding. For an ionic strength of 0.1 M the Pb(2+)/SiO(2) nanoparticle system is labile, whereas for lower ionic strengths there is loss of lability with increasing pH and decreasing ionic strength. Theoretical calculations on the basis of Eigen-type complex formation kinetics seem to support the loss of lability. This is related to the nanoparticulate nature of the system, where complexation rate constants become increasingly diffusion controlled. The ion binding heterogeneity and chemodynamics of oxidic nanoparticles clearly need further detailed research.
Collapse
|
48
|
van Leeuwen HP, Town RM, Buffle J. Chemodynamics of soft nanoparticulate metal complexes in aqueous media: basic theory for spherical particles with homogeneous spatial distributions of sites and charges. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4514-4519. [PMID: 21410210 DOI: 10.1021/la200265p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A theoretical discussion is presented to describe the formation and dissociation rate constants for metal ion binding by soft nanoparticulate complexants. The well-known framework of the Eigen mechanism for metal ion complexation by simple ligands in aqueous systems is the starting point. Expressions are derived for the rate constants for the intraparticulate individual outer-sphere and inner-sphere association and dissociation steps for the limiting cases of low and high charge densities. The charge density, binding site density, and size of the nanoparticle play crucial roles. The effects of the electrostatic potential and particle radius on the overall complexation reaction are compared with those for simple ligands. The limitations of the proposed approach for nanoparticulate ligands are discussed, and key issues for future developments are identified.
Collapse
Affiliation(s)
- Herman P van Leeuwen
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | | | | |
Collapse
|
49
|
Aiken GR, Hsu-Kim H, Ryan JN. Influence of dissolved organic matter on the environmental fate of metals, nanoparticles, and colloids. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:3196-201. [PMID: 21405118 DOI: 10.1021/es103992s] [Citation(s) in RCA: 427] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- George R Aiken
- U.S. Geological Survey , 3215 Marine Street, Boulder, Colorado 80303, United States.
| | | | | |
Collapse
|
50
|
Veeken PLRVD, Leeuwen HPV. DGT/DET gel partition features of humic acid/metal species. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:5523-5527. [PMID: 20553040 DOI: 10.1021/es100861t] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Gel layer based sensors are increasingly employed for dynamic trace metal speciation analysis in aquatic and soil media, in which humic and fulvic acid species are generally known to be relevant. In DGT (diffusive gradient in thin film), polyacrylamide hydrogels are commonly used for the diffusive gel layer. Various effects of the presence of humic species on the amount of metal detected by DGT have been observed, but the role of the different metal/humic species is still unknown. Recently it was shown that in the absence of metal, humic acid accumulates significantly in the polyacrylamide hydrogel. Here we analyze the extent of this accumulation in the presence of cadmium under various conditions of ionic strength and total humic and fulvic acid concentrations. At millimolar ionic strength level, DET data show significant accumulation of cadmium(II) in the gel phase, on top of some Donnan enrichment. The results are essential for the interpretation of DGT/DET data on metals in the presence of humics, especially in freshwaters.
Collapse
Affiliation(s)
- Pascal L R van der Veeken
- Department of Physical Chemistry and Colloid Science, Wageningen University, Wageningen, The Netherlands.
| | | |
Collapse
|