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López-Solís L, Companys E, Puy J, Blindauer CA, Galceran J. Direct determination of free Zn concentration in samples of biological interest. Anal Chim Acta 2022; 1229:340195. [DOI: 10.1016/j.aca.2022.340195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 06/25/2022] [Accepted: 07/19/2022] [Indexed: 11/01/2022]
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Rosales-Segovia K, Sans-Duñó J, Companys E, Puy J, Alcalde B, Anticó E, Fontàs C, Galceran J. Effective concentration signature of Zn in a natural water derived from various speciation techniques. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:151201. [PMID: 34699815 DOI: 10.1016/j.scitotenv.2021.151201] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 10/09/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
The uptake of nutrients or toxicants by different organisms in aquatic systems is known to correlate with different fractions of the nutrient's or toxicant's total concentration. These fractions can be provided by different analytical techniques, from which the better correlation is expected to be found for those with a characteristic length comparable to that in the considered organism uptake. An effective concentration signature can be built up with the concentration values associated to the availability (i.e. fluxes in dynamic techniques) of the nutrient or toxicant measured by various analytical techniques with different characteristic lengths. Here, this new representation was obtained for the pool of Zn complexes in the Mediterranean stream Riera d'Osor (Girona, Catalonia, Spain) with a suite of four analytical techniques. Absence of Gradients and Nernstian Equilibrium Stripping (AGNES) and Polymer Inclusion Membrane (PIM) devices provided the free Zn concentration. Linear Anodic Stripping Voltammetry provided a labile fraction (defined here as cLASV, higher than the free concentration), related to the diffusion layer scale. Diffusion Gradients in Thin-films provided higher labile fractions (known as DGT concentrations, cDGT) connected to the different characteristic lengths of different configurations (e.g. one or two resin discs) longer, in any case, than that corresponding to LASV. The combination of the information retrieved by the techniques allowed to quantify lability degrees of the pool of Zn complexes and to build up the effective concentration signature for this water.
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Affiliation(s)
- Kevin Rosales-Segovia
- Departament de Química. Universitat de Lleida, and AGROTECNIO-CERCA, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
| | - Jordi Sans-Duñó
- Departament de Química. Universitat de Lleida, and AGROTECNIO-CERCA, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
| | - Encarna Companys
- Departament de Química. Universitat de Lleida, and AGROTECNIO-CERCA, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
| | - Jaume Puy
- Departament de Química. Universitat de Lleida, and AGROTECNIO-CERCA, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
| | - Berta Alcalde
- Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Enriqueta Anticó
- Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Clàudia Fontàs
- Departament de Química, Universitat de Girona, Maria Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain
| | - Josep Galceran
- Departament de Química. Universitat de Lleida, and AGROTECNIO-CERCA, Rovira Roure 191, 25198 Lleida, Catalonia, Spain.
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Uygun HDE, Antep M, Demir MN, Merdivan M. Dispersive micro-solid-phase extraction using chitosan/polymethacrylate/clay bionanocomposite followed by UV–Vis spectrophotometry for determination of zinc. CHEMICAL PAPERS 2020. [DOI: 10.1007/s11696-020-01169-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Boehmler DJ, O'Dell ZJ, Chung C, Riley KR. Bovine Serum Albumin Enhances Silver Nanoparticle Dissolution Kinetics in a Size- and Concentration-Dependent Manner. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1053-1061. [PMID: 31902212 DOI: 10.1021/acs.langmuir.9b03251] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The dissolution of silver nanoparticles (AgNPs) to release Ag(I)(aq) is an important mechanism in potentiating AgNP cytotoxicity and imparting their antibacterial properties. However, AgNPs can undergo other simultaneous biophysicochemical transformations, such as protein adsorption, which can mediate AgNP dissolution behaviors. We report the comprehensive analysis of AgNP dissolution and protein adsorption behaviors with monolayer surface coverage of AgNPs by bovine serum albumin (BSA). AgNP dissolution rate constants, kdissolution, were quantified over several particle sizes (10, 20, and 40 nm) and BSA concentrations (0-2 nM) using linear sweep stripping voltammetry. Across all particle sizes, the dissolution rate constant increased with increasing BSA concentrations. However, protein-enhanced dissolution behaviors were most pronounced for 10 nm AgNPs, which exhibited 3.6-fold and 7.7-fold relative enhancement when compared to 20 and 40 nm AgNPs, respectively. Changes to AgNP surface properties upon interaction with BSA were monitored using dynamic light scattering and zeta potential measurements, while BSA-AgNP complex formation was evaluated using UV-vis spectroscopy and circular dichroism spectroscopy. A subtle increase in the BSA-AgNP association constant was observed with an increase in the AgNP size. Together, these results suggest that the AgNP size dependence of BSA-enhanced dissolution of AgNPs is possibly mediated through both displacement of Ag(I)(aq)-loaded BSA by excess protein in the bulk solution and minimized accessibility of the AgNP surface because of BSA adsorption.
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Affiliation(s)
- Daniel J Boehmler
- Department of Chemistry and Biochemistry , Swarthmore College , Swarthmore , Pennsylvania 19081 , United States
| | - Zachary J O'Dell
- Department of Chemistry and Biochemistry , Swarthmore College , Swarthmore , Pennsylvania 19081 , United States
| | - Christopher Chung
- Department of Chemistry and Biochemistry , Swarthmore College , Swarthmore , Pennsylvania 19081 , United States
| | - Kathryn R Riley
- Department of Chemistry and Biochemistry , Swarthmore College , Swarthmore , Pennsylvania 19081 , United States
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Tehrani MH, Companys E, Dago A, Puy J, Galceran J. New methodology to measure low free indium (III) concentrations based on the determination of the lability degree of indium complexes. Assessment of In(OH)3 solubility product. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.05.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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David CA, Galceran J, Quattrini F, Puy J, Rey-Castro C. Dissolution and Phosphate-Induced Transformation of ZnO Nanoparticles in Synthetic Saliva Probed by AGNES without Previous Solid-Liquid Separation. Comparison with UF-ICP-MS. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:3823-3831. [PMID: 30807690 DOI: 10.1021/acs.est.8b06531] [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
The variation over time of free Zn2+ ion concentration in stirred dispersions of ZnO nanoparticles (ZnO NPs) prepared in synthetic saliva at pH 6.80 and 37 °C was followed in situ (without solid-liquid separation step) with the electroanalytical technique AGNES (Absence of Gradients and Nernstian Equilibrium Stripping). Under these conditions, ZnO NPs are chemically unstable due to their reaction with phosphates. The initial stage of transformation (around 5-10 h) involves the formation of a metastable solid (presumably ZnHPO4), which later evolves into the more stable hopeite phase. The overall decay rate of ZnO NPs is significantly reduced in comparison with phosphate-free background solutions of the same ionic strength and pH. The effective equilibrium solubilities of ZnO (0.29-0.47 mg·L-1), as well as conditional excess-ligand stability constants and fractional distributions of soluble Zn species, were determined in the absence and presence of organic components. The results were compared with the conventional ultrafiltration and inductively coupled plasma-mass spectrometry (UF-ICP-MS) methodology. AGNES proves to be advantageous in terms of speed, reproducibility, and access to speciation information.
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Affiliation(s)
- Calin A David
- Departament de Química , Universitat de Lleida, and AGROTECNIO , Rovira Roure 191 , 25198 Lleida , Spain
| | - Josep Galceran
- Departament de Química , Universitat de Lleida, and AGROTECNIO , Rovira Roure 191 , 25198 Lleida , Spain
| | - Federico Quattrini
- Departament de Química , Universitat de Lleida, and AGROTECNIO , Rovira Roure 191 , 25198 Lleida , Spain
| | - Jaume Puy
- Departament de Química , Universitat de Lleida, and AGROTECNIO , Rovira Roure 191 , 25198 Lleida , Spain
| | - Carlos Rey-Castro
- Departament de Química , Universitat de Lleida, and AGROTECNIO , Rovira Roure 191 , 25198 Lleida , Spain
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Pearson HBC, Comber SDW, Braungardt CB, Worsfold P, Stockdale A, Lofts S. Determination and Prediction of Zinc Speciation in Estuaries. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:14245-14255. [PMID: 30422646 DOI: 10.1021/acs.est.8b04372] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Lowering of the estuarine Environmental Quality Standard for zinc in the UK to 121 nM reflects rising concern regarding zinc in ecosystems and is driving the need to better understand its fate and behavior and to develop and parametrize speciation models to predict the metal species present. For the first time, an extensive data set has been gathered for the speciation of zinc within an estuarine system with supporting physicochemical characterization, in particular dissolved organic carbon. WHAM/Model VII and Visual MINTEQ speciation models were used to simulate zinc speciation, using a combination of measured complexation variables and available defaults. Data for the five estuarine transects from freshwater to seawater endmembers showed very variable patterns of zinc speciation depending on river flows, seasons, and potential variations in metal and ligand inputs from in situ and ex situ sources. There were no clear relationships between free zinc ion concentration [Zn2+] and measured variables such as DOC concentration, humic and biological indices. Simulations of [Zn2+] carried out with both models at high salinities or by inputting site specific complexation capacities were successful, but overestimated [Zn2+] in low salinity waters, probably owing to an underestimation of the complexation strength of the ligands present. Uncertainties in predicted [Zn2+] are consistently smaller than standard deviations of the measured values, suggesting that the accuracy of the measurements is more critical than model uncertainty in evaluating the predictions.
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Affiliation(s)
- Holly B C Pearson
- School of Geography, Earth and Environmental Sciences , University of Plymouth , Plymouth Devon , PL4 8AA , U.K
| | - Sean D W Comber
- School of Geography, Earth and Environmental Sciences , University of Plymouth , Plymouth Devon , PL4 8AA , U.K
| | - Charlotte B Braungardt
- School of Geography, Earth and Environmental Sciences , University of Plymouth , Plymouth Devon , PL4 8AA , U.K
| | - Paul Worsfold
- School of Geography, Earth and Environmental Sciences , University of Plymouth , Plymouth Devon , PL4 8AA , U.K
| | - Anthony Stockdale
- School of Earth and Environment , University of Leeds , LS2 9JT , U.K
| | - Stephen Lofts
- Centre for Ecology & Hydrology , Lancaster Environment Centre , Library Avenue , Bailrigg , Lancaster LA1 4AP , U.K
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Comparison of different speciation techniques to measure Zn availability in hydroponic media. Anal Chim Acta 2018; 1035:32-43. [DOI: 10.1016/j.aca.2018.06.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 06/06/2018] [Accepted: 06/25/2018] [Indexed: 11/22/2022]
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Tehrani MH, Companys E, Dago A, Puy J, Galceran J. Free indium concentration determined with AGNES. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 612:269-275. [PMID: 28850847 DOI: 10.1016/j.scitotenv.2017.08.200] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 06/27/2017] [Accepted: 08/18/2017] [Indexed: 06/07/2023]
Abstract
Indium is increasingly used in electronic devices, from which it can be mobilized towards environmental compartments. Speciation of In in waters is important for its direct ecotoxicological effects, as well as for the fate of this element in the environment (e.g. fluxes from or towards sediments). Free indium concentrations in the environment can be extremely low due to hydrolysis, especially important in trivalent cations, to precipitation and to complexation with different ligands. In this work, the free indium concentration (which is a toxicologically and geochemically relevant fraction) in aqueous solutions at pH3 has been measured with an adapted version of the electroanalytical technique AGNES (Absence of Gradients and Nernstian Equilibrium Stripping). Speciation measurements in mixtures of indium with the ligands NTA (nitrilotriacetic acid) and oxalate indicate that the values of their stability constants in the NIST46.6 database are less adequate than those published in some more recent literature. The extraordinary lability and mobility of In-oxalate complexes allow the measuring of free indium concentrations below nmol/L in just 25s of deposition time.
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Affiliation(s)
- Marjan H Tehrani
- Departament de Química, Universitat de Lleida, and AGROTECNIO, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
| | - Encarna Companys
- Departament de Química, Universitat de Lleida, and AGROTECNIO, Rovira Roure 191, 25198 Lleida, Catalonia, Spain.
| | - Angela Dago
- Departament de Química, Universitat de Lleida, and AGROTECNIO, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
| | - Jaume Puy
- Departament de Química, Universitat de Lleida, and AGROTECNIO, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
| | - Josep Galceran
- Departament de Química, Universitat de Lleida, and AGROTECNIO, Rovira Roure 191, 25198 Lleida, Catalonia, Spain
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Rees AB, Gallagher A, Comber S, Wright LA. An analysis of variable dissolution rates of sacrificial zinc anodes: a case study of the Hamble estuary, UK. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:21422-21433. [PMID: 28744681 DOI: 10.1007/s11356-017-9762-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 07/11/2017] [Indexed: 05/27/2023]
Abstract
Sacrificial anodes are intrinsic to the protection of boats and marine structures by preventing the corrosion of metals higher up the galvanic scale through their preferential breakdown. The dissolution of anodes directly inputs component metals into local receiving waters, with variable rates of dissolution evident in coastal and estuarine environments. With recent changes to the Environmental Quality Standard (EQS), the load for zinc in estuaries such as the Hamble, UK, which has a large amount of recreational craft, now exceeds the zinc standard of 7.9 μg/l. A survey of boat owners determined corrosion rates and estimated zinc loading at between 6.95 and 7.11 t/year. The research confirms the variable anode corrosion within the Hamble and highlighted a lack of awareness of anode technology among boat owners. Monitoring and investigation discounted metal structures and subterranean power cables as being responsible for these variations but instead linked accelerated dissolution to marina power supplies and estuarine salinity variations.
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Affiliation(s)
- Aldous B Rees
- School of Maritime Science and Engineering, Southampton Solent University, East Park Terrace, Southampton, SO14 0YN, UK.
| | - Anthony Gallagher
- School of Maritime Science and Engineering, Southampton Solent University, East Park Terrace, Southampton, SO14 0YN, UK
| | - Sean Comber
- School of Geography, Earth and Environmental Sciences (Faculty of Science and Engineering), Plymouth University, Drake Circus, Plymouth, Devon, PL4 8AA, UK
| | - Laurence A Wright
- School of Maritime Science and Engineering, Southampton Solent University, East Park Terrace, Southampton, SO14 0YN, UK
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Constantino C, Comber SDW, Scrimshaw MD. The effect of wastewater effluent derived ligands on copper and zinc complexation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:8363-8374. [PMID: 28176154 PMCID: PMC5384957 DOI: 10.1007/s11356-016-8332-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 12/25/2016] [Indexed: 06/06/2023]
Abstract
The shift toward bioavailability-based standards for metals such as copper and zinc not only improves the ecological relevance of the standard but also introduces significant complexity into assessing compliance. This study examined differences in the copper and zinc complexation characteristics of effluents from a range of different sewage treatment works and in relation to so-called 'natural' samples. This information is essential to determine whether the inclusion of effluent-specific complexation characteristics within the regulatory framework could enhance the environmental relevance of compliance criteria. The data show that for copper, binding affinity was not greater than that measured for materials derived from the receiving water environment, with a mean log K of between 4.4 and 5.15 and mean complexation capacity ranging from 38 to 120 μg/mg dissolved organic carbon (DOC) for effluents compared with a log K of 5.6 and complexation capacity of 37 μg/mg DOC for the Suwannee River fulvic acid. For zinc, however, effluents exhibited a much higher complexation capacity, with effluent means ranging from 3 to 23 μg/mg DOC compared with the Suwannee River fulvic acid, for which the complexation capacity could not be determined. Synthetic ligands in sewage effluent, such as ethylenediaminetetraacetic acid (EDTA), are implicated as contributing to these observed differences. This suggests that the current biotic ligand models for zinc might overstate the risk of harm in effluent-impacted waters. The data also show that the copper and zinc complexation characteristics of effluent samples obtained from the same sewage treatment works were less different from one another than those of effluents from other treatment works and therefore that sewage source has an important influence on complexation characteristics. The findings from this study support the case that the contribution to complexation from effluent-derived ligands could enhance the environmental relevance of bioavailability-based compliance criteria, in particular for zinc, owing to the additional complexation capacity afforded by effluent-derived ligands.
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Affiliation(s)
- C Constantino
- Atkins Limited, Chilbrook, Oasis Business Park, Eynsham, Witney, OX29 4AH, UK.
| | - S D W Comber
- Biogeochemistry Research Centre, Plymouth University, Plymouth, PL4 8AA, UK
| | - M D Scrimshaw
- Institute of Environment, Health and Societies, Brunel University, Uxbridge, UB8 3PH, UK
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