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Eldan M, Masue-Slowey Y. Environmental fate of monosodium methanearsonate (MSMA)-Part 1: Conceptual model. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2024; 20:1859-1875. [PMID: 38924690 DOI: 10.1002/ieam.4961] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 04/30/2024] [Accepted: 05/02/2024] [Indexed: 06/28/2024]
Abstract
Monosodium methanearsonate (MSMA), the sodium salt of monomethylarsonic acid (MMA), is used as a selective, broad-spectrum contact herbicide to control weeds in cotton and a variety of turf. In water, MSMA dissociates into ions of sodium (Na+) and of MMA-, which is the herbicide's active component. Certain soil microorganisms can methylate MMA to dimethylarsinic acid (DMA) other microorganisms can demethylate MMA to inorganic arsenic (iAs). To predict the groundwater concentration of iAs that may result from MSMA application, the processes affecting the environmental behavior of MSMA must be quantified and modeled. There is an extensive body of literature regarding the environmental behavior of MSMA. There is a consensus among scientists that the fate of MMA in soil is controlled by microbial activity and sorption to solid surfaces and that iAs sorption is even more extensive than that of MMA. The sorption and transformation of MMA and its metabolites are affected by several factors including aeration condition, temperature, pH, and the availability of nutrients. The precise nature and extent of each of these processes vary depending on site-specific conditions; however, such variability is constrained in typical MSMA use areas that are highly managed. Monomethylarsonic acid is strongly sorbed on mineral surfaces and becomes sequestered into the soil matrix. Over time, a greater portion of MMA and iAs becomes immobile and unavailable to soil microorganisms and to leaching. This review synthesizes the results of studies that are relevant for the behavior of MSMA used as a herbicide to reliably predict the fate of MSMA in its use conditions. Integr Environ Assess Manag 2024;20:1859-1875. © 2024 The Author(s). Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).
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Affiliation(s)
- Michal Eldan
- Luxembourg Industries Ltd., The Organic Arsenical Products Task Force, Washington, District of Columbia, USA
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2
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Williams WM, Cheplick JM, Cohen SZ, Eldan M, Hoogeweg CG, Masue-Slowey Y, Vamshi R. Environmental fate of monosodium methanearsonate (MSMA)-Part 2: Modeling sequestration and transformation. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2024; 20:2076-2087. [PMID: 38923787 DOI: 10.1002/ieam.4962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 04/30/2024] [Accepted: 05/03/2024] [Indexed: 06/28/2024]
Abstract
Monosodium methanearsonate (MSMA), a sodium salt of monomethylarsonic acid (MMA), is a selective contact herbicide used for the control of a broad spectrum of weeds. In water, MSMA dissociates to ions of sodium (Na+) and monomethylarsonate (MMA-) that is stable and does not transform abiotically. In soils characteristic of MSMA use, several simultaneous processes can occur: (1) microbial methylation of MMA to dimethylarsinic acid (DMA), (2) microbial demethylation of MMA to inorganic arsenic (iAs), (3) methylation of iAs to MMA, and (4) sorption and sequestration of MMA and its metabolites to soil minerals. Sequestered residues are residues that cannot be desorbed from soil in environmental conditions. Sequestration is rapid in the initial several days after MSMA application and continues at a progressively slower rate over time. Once sequestered, MMA and its metabolites are inaccessible to soil microorganisms and cannot be transformed. The rate and extent of the sorption and sequestration as well as the mobility of MMA and its metabolites depend on the local edaphic conditions. In typical MSMA use areas, the variability of the edaphic conditions is constrained. The goal of this research was to estimate the amount of iAs potentially added to drinking water as a result of the use of MSMA, with models and scenarios developed by the US Environmental Protection Agency for pesticide risk assessment. In this project, the estimated drinking water concentrations (EDWCs) for iAs were assessed as the average concentration in the reservoir over a 30-year simulation with annual applications of MSMA at maximum label rates. When the total area of suitable land was assumed to be treated, EDWCs ranged from <0.001 to 0.12 µg/L. When high estimates of actually treated acreage are considered, the EDWCs are below 0.06 µg/L across all scenarios. Integr Environ Assess Manag 2024;20:2076-2087. © 2024 The Author(s). Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).
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Affiliation(s)
| | | | - Stuart Z Cohen
- Environmental & Turf Services, Inc., Wheaton, Maryland, USA
| | - Michal Eldan
- Luxembourg Industries Ltd., The Organic Arsenical Products Task Force, Washington, District of Columbia, USA
| | | | | | - Raghu Vamshi
- Waterborne Environmental, Inc., Leesburg, Virginia, USA
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Miner P, Cohen S. Fate of 14 C-MSMA in a soil column study simulating herbicide use environments. JOURNAL OF ENVIRONMENTAL QUALITY 2023; 52:730-740. [PMID: 36807892 DOI: 10.1002/jeq2.20465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 02/04/2023] [Indexed: 05/06/2023]
Abstract
Monosodium methanearsonate (MSMA), a selective contact herbicide, is a sodium salt of monomethyl arsenic acid (MMA or MAA). This paper focuses on the environmental fate of MMA. Decades of research have shown that a significant portion of applied MSMA drips to soil and is sorbed quickly. The fraction available for leaching or biological uptake decreases at a biphasic rate, first rapidly and then at a slower rate. A soil column study was designed to obtain quantitative information about MMA sorption and transformation and the effects of different environmental variables on these processes, in conditions simulating the environment of MSMA use on cotton and turf. Using 14 C-MSMA, this study quantified MSMA-derived arsenic species and differentiated between added arsenic and soil background levels. Similar behavior of MSMA was observed across all test systems with respect to sorption, transformation, and mobility, despite differences in soil type and rainfall treatment. All soil columns exhibited a rapid sorption of added MMA followed by continual sorption of residues into the soil matrix. Within the first 2 days, only 20%-25% of radioactivity was extracted by water. On day 90, less than 3.1% of added MMA was in a water extractable phase. MMA sorption was most rapid in the soil with the higher clay content. Dominant extractable arsenic species were MMA, dimethylarsinic acid, and arsenate, indicating that methylation and demethylation occurred. In all MSMA-treated columns, arsenite concentrations were negligible and indiscernible from those in untreated columns.
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Affiliation(s)
| | - Stuart Cohen
- Environmental & Turf Services, Inc., Wheaton, MD, USA
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Jeong S, Kang J, Cho M, An J, Yoon HO. New insights into surface behavior of dimethylated arsenicals on montmorillonite using X-ray absorption spectroscopy. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 852:158531. [PMID: 36063923 DOI: 10.1016/j.scitotenv.2022.158531] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 08/21/2022] [Accepted: 08/31/2022] [Indexed: 06/15/2023]
Abstract
Although recent studies have revealed the occurrence of dimethylated arsenicals, little is known about their behavior in environment. This study investigates the adsorption behavior of dimethylarsinic acid (DMAV), dimethyldithioarsinic acid (DMDTAV), and dimethylmonothioarsinic acid (DMMTAV) on montmorillonite. Complicated transformations among arsenicals under normal environmental conditions were also considered. Our results clearly demonstrate that DMDTAV was oxidized to DMMTAV, which was relatively stable but partially transformed to DMAV when exposed to air during adsorption. The transformed DMAV exhibited high adsorption affinities for montmorillonite, while DMMTAV and DMDTAV were not appreciably retained by montmorillonite for 48 h. This is the first study to provide insights into DMDTAV oxidation under environmental conditions. X-ray absorption near edge structure and extended X-ray absorption fine structure studies confirmed that most of the adsorbed arsenicals on montmorillonite were DMAV. The significantly different bonding characteristics of each adsorbed DMAV provide direct evidence for the transformation of DMAV from DMDTAV and DMMTAV. Our study suggests the importance of incorporating the DMMTAV in the realistic risk management for soil environments because it is highly toxic, easily transformed from DMDTAV, and stable in the environment.
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Affiliation(s)
- Seulki Jeong
- Seoul Center, Korea Basic Science Institute, 6-7, Inchon-ro 22-gil, Seongbuk-gu, Seoul 02855, Republic of Korea
| | - Jinback Kang
- Seoul Center, Korea Basic Science Institute, 6-7, Inchon-ro 22-gil, Seongbuk-gu, Seoul 02855, Republic of Korea
| | - Minkyu Cho
- Seoul Center, Korea Basic Science Institute, 6-7, Inchon-ro 22-gil, Seongbuk-gu, Seoul 02855, Republic of Korea
| | - Jinsung An
- Department of Civil & Environmental Engineering, Hanyang University, Ansan 15588, Republic of Korea
| | - Hye-On Yoon
- Seoul Center, Korea Basic Science Institute, 6-7, Inchon-ro 22-gil, Seongbuk-gu, Seoul 02855, Republic of Korea.
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Linam F, McCoach K, Limmer MA, Seyfferth AL. Contrasting effects of rice husk pyrolysis temperature on silicon dissolution and retention of cadmium (Cd) and dimethylarsinic acid (DMA). THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 765:144428. [PMID: 33412375 DOI: 10.1016/j.scitotenv.2020.144428] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 12/07/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
Arsenic (As) and cadmium (Cd) are two toxins that affect rice, and their ability to do so may be lessened by soil incorporation of rice husk residues. Rice husks are typically removed from fields and used as a fuel source at rice mills but contain silicon (Si) and other nutrients. It has previously been shown that soil incorporation of rice husk or charred husk can release Si to soil solution to decrease As uptake and promote As methylation, and studies suggest char can additionally decrease Cd availability through several potential mechanisms including adsorption, precipitation, liming, and growth dilution. Charring conditions will impact husk Si dissolution rate and potential to immobilize Cd and possibly methylated As. Here, we compared uncharred husk to husk biochars pyrolyzed at 450, 600, 750, and 900 °C for differences in Si dissolution rate and adsorption of Cd and dimethylarsinic acid (DMA)-the dominant methylated As species present in paddy soils and grain. We hypothesized that Si dissolution rate and Cd adsorption would decrease, and DMA adsorption would increase with pyrolysis temperature. Si release decreased with pyrolysis temperature in the general order: uncharred husk > 450 °C > 600 °C = 750 °C = 950 °C but those differences were not due to SiO2 crystallization with increasing temperature. Additionally, short (< 5 d) lab-based extractions underestimate Si release from uncharred husk while overestimating release from biochars. Controlling for pH changes/liming effect, adsorption isotherms showed very weak DMA adsorption, while Cd adsorption was favored on higher temperature (950 °C) biochar and was not predicted well by cation exchange capacity (CEC). When applied in a soil incubation study using non-contaminated soil, the biochar had no impact on Cd porewater concentrations while low temperature (450 °C) rice husk biochar led to the highest Si:As ratio. Biochar did not strongly influence Cd and DMA solubility at 1% w/w amendment.
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Affiliation(s)
- Franklin Linam
- Department of Plant & Soil Sciences, University of Delaware, 531 S. College Avenue, Townsend Hall Rm. 152, Newark, DE, 19716, USA.
| | - Kendall McCoach
- Department of Plant & Soil Sciences, University of Delaware, 531 S. College Avenue, Townsend Hall Rm. 152, Newark, DE, 19716, USA.
| | - Matt A Limmer
- Department of Plant & Soil Sciences, University of Delaware, 531 S. College Avenue, Townsend Hall Rm. 152, Newark, DE, 19716, USA.
| | - Angelia L Seyfferth
- Department of Plant & Soil Sciences, University of Delaware, 531 S. College Avenue, Townsend Hall Rm. 152, Newark, DE, 19716, USA.
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Lee KHK, Peralta JE, Abboud KA, Christou G. Iron(III)-Oxo Cluster Chemistry with Dimethylarsinate Ligands: Structures, Magnetic Properties, and Computational Studies. Inorg Chem 2020; 59:18090-18101. [PMID: 33291879 DOI: 10.1021/acs.inorgchem.0c02554] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A program has been initiated to develop FeIII/oxo cluster chemistry with the "pseudocarboxylate" ligand dimethylarsinate (Me2AsO2-) for comparison with the well investigated FeIII/oxo/carboxylate cluster area. The synthesis and characterization of three polynuclear FeIII complexes are reported, [Fe12O4(O2CtBu)8(O2AsMe2)17(H2O)3]Cl3 (1), Na2[Fe12Na2O4(O2AsMe2)20(NO3)6(Me2AsO2H)2(H2O)4](NO3)6 (2), and [Fe3(O2AsMe2)6(Me2AsO2H)2(hqn)2](NO3) (3), where hqnH is 8-hydroxyquinoline. The Fe12 core of 1 is a type never previously encountered in FeIII carboxylate chemistry, consisting of two Fe6 units each of which comprises two {Fe3(μ3-O2-)} units bridged by three Me2AsO2- groups and linked into an Fe12 loop structure by two anti-anti η1:η1:μ Me2AsO2- groups, a bridging mode extremely rare with carboxylates. 2 also consists of two Fe6 units, differing in their ligation from those in 1, and this time linked together into a linear structure by a central {Na2(NO3)2} bridging unit. 3 is a linear Fe3 complex with no monatomic bridges between FeIII ions, a very rare situation in FeIII chemistry with any ligands and unprecedented in Fe carboxylate chemistry. The distinct differences observed in arsinate vs carboxylate ligation modes are rationalized largely based on the greater basicity of the former vs the latter. Variable-temperature dc and ac magnetic susceptibility data reveal all Fe2 pairwise interactions to be antiferromagnetic. For 1 and 2, the different Jij couplings were estimated by use of a magnetostructural correlation for high nuclearity FeIII-oxo clusters and by density functional theory calculations using broken symmetry methods, allowing identification of their relative spin vector alignments and thus rationalization of their S = 0 ground states. The Jij values were then used as input values to give excellent fits of the experimental χMT vs T data. For 3, the fits of the experimental χMT vs T data to the Van Vleck equation or with PHI gave a very weak J12 = -0.8(1) cm-1 (H = -2JŜi·Ŝj convention) between adjacent FeIII ions and an S = 5/2 ground state. These initial FeIII arsinate complexes also provide structural parameters that help validate literature assignments of arsinate binding modes to iron oxide/hydroxide minerals as part of environmental concerns of using arsenic-containing herbicides in agriculture.
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Affiliation(s)
- Kenneth Hong Kit Lee
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Juan E Peralta
- Department of Physics and Science of Advanced Materials, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Khalil A Abboud
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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Soldoozy S, Trinh A, Kubicki JD, Al-Abadleh HA. In Situ and Real-Time ATR-FTIR Temperature-Dependent Adsorption Kinetics Coupled with DFT Calculations of Dimethylarsinate and Arsenate on Hematite Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4299-4307. [PMID: 32243161 DOI: 10.1021/acs.langmuir.0c00252] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Temperature-dependent kinetic studies of the adsorption of critical pollutants onto reactive components in soils and removal technologies provide invaluable rate information and mechanistic insight. Using attenuated total internal reflection Fourier transform infrared spectroscopy, we collected in situ spectra as a function of time, concentration, and temperature in the range of 5-50 °C (278-323 K) for the adsorption of arsenate (iAs) and dimethylarsinate (DMA) on hematite nanoparticles at pH 7. These experimental data were modeled with density functional theory (DFT) calculations on the energy barriers between surface complexes. The Langmuir adsorption kinetic model was used to extract values of the fast (<5 min) and slow (6-10 min) observed adsorption rate, initial rate constants of adsorption and desorption, Arrhenius parameters, effective activation energies (ΔEa), and pre-exponential factors (A). The trend in the kinetic parameters correlated with the type of surface complexes that iAs and DMA form, which are mostly bidentate binuclear compared to a mix of outer sphere and monodentate, respectively. The observed initial adsorption rates were found to be more sensitive to changes in the aqueous concentration of the arsenicals than slow rates. On average, iAs adsorbs 2.5× faster and desorbs 4× slower than dimethylarsinate (DMA). The ΔEa and A values for the adsorption of iAs bidentate complexes are statistically higher than those extracted for outer-sphere DMA by a factor of 3. The DFT results on adsorption energies and ΔEa barriers are consistent with the experimental data and provide a mechanistic explanation for the low ΔEa values observed. The presence of defect sites with under-coordinated Fe atoms or exchangeable surface water (i.e., Fe-OH2 groups) lowers activation barriers of adsorption. These results suggest that increasing organic substitutions on arsenate at the expense of As-O bonds decreases the effective energy barrier for complex formation and lowers the number of collisional orientations that result in binding to the hematite surface.
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Affiliation(s)
- Sara Soldoozy
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada
| | - Anthony Trinh
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada
| | - James D Kubicki
- Department of Geological Sciences, The University of Texas at El Paso, El Paso, Texas 79968, United States
| | - Hind A Al-Abadleh
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada
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Kerl CF, Ballaran TB, Planer-Friedrich B. Iron Plaque at Rice Roots: No Barrier for Methylated Thioarsenates. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:13666-13674. [PMID: 31675232 DOI: 10.1021/acs.est.9b04158] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Iron (hydr)oxide coating at rice roots, so-called iron plaque (IP), is often an important barrier for uptake of inorganic oxyarsenic species and their accumulation in rice grains. Sorption of methylated thioarsenates, which can co-exist with inorganic and methylated oxyarsenates in paddy soils, was not studied yet, even though these toxic species were detected in xylem and grains of rice plants before. Hydroponic experiments at pH 6.5 with 20 day-old rice plants showed lower net arsenic enrichment in IP for plants exposed to monomethylthioarsenate (MMMTA) compared to monomethylarsenate (MMA) and no enrichment for dimethylmonothioarsenate (DMMTA). Goethite was the dominant mineral phase in our IP. Sorption experiments with synthesized goethite and ferrihydrite revealed a 30-times-higher sorption capacity for MMMTA to amorphous ferrihydrite than to crystalline goethite, comparable to methylated oxyarsenates. No evidence for direct MMMTA binding was found. Instead, we postulate that MMMTA transformation to MMA is a prerequisite for removal. DMMTA showed very little sorption, even to amorphous ferrihydrite, which is in line with a lack of direct binding and reported slow transformation to dimethylarsenate. Our study implies that IP is no effective barrier for methylated thioarsenates and that especially DMMTA is very mobile with a high risk of uptake in rice plants.
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Li Z, Liu X, Jin W, Hu Q, Zhao Y. Adsorption behavior of arsenicals on MIL-101(Fe): The role of arsenic chemical structures. J Colloid Interface Sci 2019; 554:692-704. [DOI: 10.1016/j.jcis.2019.07.046] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 07/06/2019] [Accepted: 07/16/2019] [Indexed: 10/26/2022]
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Zhu M, Hu X, Tu C, Zhang H, Song F, Luo Y, Christie P. Sorption mechanisms of diphenylarsinic acid on ferrihydrite, goethite and hematite using sequential extraction, FTIR measurement and XAFS spectroscopy. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 669:991-1000. [PMID: 30970466 DOI: 10.1016/j.scitotenv.2019.03.166] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 03/11/2019] [Accepted: 03/12/2019] [Indexed: 06/09/2023]
Abstract
Diphenylarsinic acid (DPAA) is an organoarsenic compound derived from abandoned chemical weapons. DPAA sorption by iron (hydr)oxides is of considerable importance but remains largely unexplored. The current study aimed at investigating the sorption mechanisms of DPAA on ferrihydrite, goethite and hematite using both macroscopic sorption kinetics and sequential extraction procedure (SEP) as well as microscopic Fourier transformed infrared (FTIR) and extended X-ray absorption fine structure (EXAFS) spectroscopic techniques. Sorption kinetics studies show that >93% of added DPAA (4-100 mg L-1) was sorbed on ferrihydrite and hematite within 5 min, while only 84% of added DPAA (100 mg L-1) was sorbed on goethite after 24 h. The sequential extraction results and FTIR measurements reveal that DPAA formed simultaneously inner- and outer-sphere complexes on goethite and hematite, but predominantly inner-sphere complexes on ferrihydrite with limited formation of outer-sphere complexes (<15%). A combination of SEP, FTIR and EXAFS techniques further enables identification of the interfacial reactions between DPAA and solid surfaces of iron (hydr)oxides and the mechanisms involved. Results indicate that DPAA interacted with these iron (hydr)oxides via (1) electrostatic attraction or hydrogen bonding, (2) surface complexation and (3) complexation embedded inside the mineral particles. EXAFS studies further demonstrate that DPAA formed mainly bidentate binuclear corner-sharing (2C) complexes regardless of the iron substrate, with As-Fe distances at 3.19-3.32 Å. Comparison of these results with available data in the literature on inorganic, methyl and phenyl arsenics (As) suggests that it is the phenyl group substitution that finally determines the predominance of 2C complexes. Results from the present study will improve our knowledge of DPAA interaction with solid surfaces and may help in the prediction of the environmental fate and environmental risk management of DPAA in the soil-water system.
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Affiliation(s)
- Meng Zhu
- College of Environmental Science and Engineering, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, China
| | - Xuefeng Hu
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Chen Tu
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Haibo Zhang
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China
| | - Fang Song
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Yongming Luo
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
| | - Peter Christie
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
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Nisticò R, Celi LR, Bianco Prevot A, Carlos L, Magnacca G, Zanzo E, Martin M. Sustainable magnet-responsive nanomaterials for the removal of arsenic from contaminated water. JOURNAL OF HAZARDOUS MATERIALS 2018; 342:260-269. [PMID: 28843795 DOI: 10.1016/j.jhazmat.2017.08.034] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 08/11/2017] [Accepted: 08/13/2017] [Indexed: 06/07/2023]
Abstract
In this study, chitosan and bio-based substances (BBS) obtained from composted biowaste were used as stabilizers for the synthesis of magnet-sensitive nanoparticles (NPs) via coprecipitation method. A pyrolysis treatment was carried out on both biopolymers at 550°C, and their consequent conversion into a carbon matrix was followed by means of different physicochemical characterization techniques (mainly FTIR spectroscopy and XRD), whereas magnetic properties were evaluated by magnetization curves. The prepared materials were tested in water remediation processes from arsenic (As) species (both inorganic and organic forms). These tests, explained by means of the most common adsorption models, evidenced that the best performances were reached by both materials obtained after pyrolysis treatments, pointing out the promising application of such magnet-sensitive materials as easy-recoverable tools for water purification treatments.
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Affiliation(s)
- Roberto Nisticò
- University of Torino, Department of Chemistry, Via P. Giuria 7, 10125 Torino, Italy; Polytechnic of Torino, Department of Applied Science and Technology DISAT, C.so Duca Degli Abruzzi 24, 10129 Torino, Italy.
| | - Luisella R Celi
- University of Torino, Department of Agricultural, Forest and Food Sciences, Soil Biogeochemistry, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
| | | | - Luciano Carlos
- Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, PROBIEN (CONICET-UNCo), Buenos Aires 1400, Neuquén, Argentina
| | - Giuliana Magnacca
- University of Torino, Department of Chemistry, Via P. Giuria 7, 10125 Torino, Italy; NIS (Nanostructured Interphases and Surfaces) Centre, Via P. Giuria 7, 10125 Torino, Italy
| | - Elena Zanzo
- University of Torino, Department of Agricultural, Forest and Food Sciences, Soil Biogeochemistry, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
| | - Maria Martin
- University of Torino, Department of Agricultural, Forest and Food Sciences, Soil Biogeochemistry, Largo Paolo Braccini 2, 10095 Grugliasco, Italy
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12
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Effects of Iron Amendments on the Speciation of Arsenic in the Rice Rhizosphere after Drainage. SOILS 2017. [DOI: 10.3390/soils1010006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Ou L, Gannon TW, Polizzotto ML. Impact of soil organic carbon on monosodium methyl arsenate (MSMA) sorption and species transformation. CHEMOSPHERE 2017; 186:243-250. [PMID: 28783547 DOI: 10.1016/j.chemosphere.2017.07.147] [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: 05/18/2017] [Revised: 07/12/2017] [Accepted: 07/28/2017] [Indexed: 06/07/2023]
Abstract
Monosodium methyl arsenate (MSMA), a common arsenical herbicide, is a major contributor of anthropogenic arsenic (As) to the environment. Uncertainty about controls on MSMA fate and the rates and products of MSMA species transformation limits effective MSMA regulation and management. The main objectives of this research were to quantify the kinetics and mechanistic drivers of MSMA species transformation and removal from solution by soil. Laboratory MSMA incubation studies with two soils and varying soil organic carbon (SOC) levels were conducted. Arsenic removal from solution was more extensive and faster in sandy clay loam incubations than sand incubations, but for both systems, As removal was biphasic, with initially fast removal governed by sorption, followed by slower As removal limited by species transformation. Dimethylarsinic acid was the dominant product of species transformation at first, but inorganic As(V) was the ultimate transformation product by experiment ends. SOC decreased As removal and enhanced As species transformation, and SOC content had linear relationships with As removal rates (R2 = 0.59-0.95) for each soil and reaction phase. These results reveal the importance of edaphic conditions on inorganic As production and overall mobility of As following MSMA use, and such information should be considered in MSMA management and regulatory decisions.
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Affiliation(s)
- Ling Ou
- Department of Botany and Plant Pathology, Purdue University, 915 W State St, West Lafayette, IN, 47907, United States.
| | - Travis W Gannon
- Department of Crop and Soil Sciences, North Carolina State University, 101 Derieux Pl, Raleigh, NC 27695, United States.
| | - Matthew L Polizzotto
- Department of Crop and Soil Sciences, North Carolina State University, 101 Derieux Pl, Raleigh, NC 27695, United States.
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14
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Fu D, He Z, Su S, Xu B, Liu Y, Zhao Y. Fabrication of α-FeOOH decorated graphene oxide-carbon nanotubes aerogel and its application in adsorption of arsenic species. J Colloid Interface Sci 2017; 505:105-114. [DOI: 10.1016/j.jcis.2017.05.091] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Revised: 05/24/2017] [Accepted: 05/25/2017] [Indexed: 11/27/2022]
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15
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Adamescu A, Hamilton IP, Al-Abadleh HA. Density functional theory calculations on the adsorption of monomethylarsonic acid onto hydrated iron (oxyhydr)oxide clusters. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.03.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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16
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Adamescu A, Hamilton IP, Al-Abadleh HA. Dispersion Effects on the Thermodynamics and Transition States of Dimethylarsinic Acid Adsorption on Hydrated Iron (Oxyhydr)oxide Clusters from Density Functional Theory Calculations. J Phys Chem A 2016; 120:9270-9280. [DOI: 10.1021/acs.jpca.6b08367] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Adrian Adamescu
- Chemistry
Department, University of Waterloo Waterloo, Ontario N2L 3G1, Canada
| | - I. P. Hamilton
- Department
of Chemistry and Biochemistry, Wilfrid Laurier University Waterloo, Ontario N2L 3C5, Canada
| | - Hind A. Al-Abadleh
- Department
of Chemistry and Biochemistry, Wilfrid Laurier University Waterloo, Ontario N2L 3C5, Canada
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17
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Fu QL, He JZ, Blaney L, Zhou DM. Sorption of roxarsone onto soils with different physicochemical properties. CHEMOSPHERE 2016; 159:103-112. [PMID: 27281543 DOI: 10.1016/j.chemosphere.2016.05.081] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 05/21/2016] [Accepted: 05/28/2016] [Indexed: 06/06/2023]
Abstract
Elevated roxarsone (ROX) concentrations in soils, caused by land application of ROX-bearing poultry litter, mandate investigation of ROX sorption onto soils. Equilibrium and kinetic studies of ROX sorption onto five soils were carried out to explore the relationship between sorption parameters and soil properties, and to reveal the effects of coexisting humic acid (HA), P(V), As(V), and As(III) on ROX transport. Experimental results indicated that ROX sorption reached equilibrium within 24 h, with pseudo-second order rate constants of 5.74-5.26 × 10(2) g/(mg h); film and intra-particle diffusion were the rate-limiting processes. ROX sorption to soils involved partitioning and adsorption phenomena; however, their relative contributions varied for different soils. The maximum ROX sorption varied with soil type, ranging from 0.59 to 4.12 mg/g. Results from correlation analysis and multiple linear regressions revealed that the maximum sorption capacities, partition coefficients, and desorption percentages were correlated with soil properties, especially iron content, total organic carbon, and dissolved organic carbon. ROX sorption to soils was affected more by soil pH than the initial pH of ROX-containing solutions. Carboxylic and amide functional groups were determined to be responsible for ROX sorption to soils. ROX sorption capacities decreased in the presence of HA, P(V), As(V), and As(III), indicating that ROX mobility in soils was facilitated by dissolved organic matter (DOM) and competing anions.
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Affiliation(s)
- Qing-Long Fu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jian-Zhou He
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lee Blaney
- Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
| | - Dong-Mei Zhou
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
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18
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Yang H, He M. Adsorption of methylantimony and methylarsenic on soils, sediments, and mine tailings from antimony mine area. Microchem J 2015. [DOI: 10.1016/j.microc.2015.06.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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19
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Sabur MA, Al-Abadleh HA. Surface interactions of monomethylarsonic acid with hematite nanoparticles studied using ATR-FTIR: adsorption and desorption kinetics. CAN J CHEM 2015. [DOI: 10.1139/cjc-2015-0350] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Monomethylarsonic acid (MMA) is an organoarsenical compound which, along with dimethylarsinic acid (DMA), poses health and environmental concerns. Little is known about the surface chemistry of MMA at the molecular level with materials relevant to geochemical environments and industrial sectors. We report the structure of MMA surface complexes and the adsorption/desorption kinetics of MMA to and from hematite as a model for reactive iron-containing materials commonly found in geosorbents and arsenic-removal technologies. Attenuated total internal reflectance Fourier transform infrared (ATR-FTIR) spectroscopy was used to study the surface interactions at the molecular level. Spectra of adsorbed MMA (MMA(ads)) were collected as a function of time and aqueous-phase concentration. Values for the apparent rates of adsorption and desorption were extracted from experimental data at pH 7 as a function of spectral components during the initial times of surface interactions (0–5 min). Results showed that MMA adsorbs on hematite nanoparticles with rates 1.3 to 1.6 times slower than arsenate. The desorption of MMA(ads) by hydrogen phosphate from hematite surfaces is 2× faster than arsenate, and proceeds with an overall nonunity order, suggesting the existence of more than one type of surface complex at equilibrium. Also, hydrogen phosphate leads to the desorption of about 67% of MMA(ads) compared with 26% of surface arsenate. Adsorption kinetics for aqueous hydrogen phosphate were also investigated in the absence and presence of surface arsenic and followed this order: fresh hematite > MMA/hematite ≥ iAs(V)/hematite. From this study, it can be inferred that, on average, the presence of the methyl group in MMA results in weaker surface interactions with hematite relative to arsenate under neutral pH because of the simultaneous formation of mono- and bidentate MMA complexes compared with predominantly bidentate complexes for arsenate.
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Affiliation(s)
- Md Abdus Sabur
- Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Hind A. Al-Abadleh
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
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20
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Hu C, Chen Q, Liu H, Qu J. Coagulation of methylated arsenic from drinking water: Influence of methyl substitution. JOURNAL OF HAZARDOUS MATERIALS 2015; 293:97-104. [PMID: 25855566 DOI: 10.1016/j.jhazmat.2015.03.055] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 03/23/2015] [Accepted: 03/25/2015] [Indexed: 06/04/2023]
Abstract
Methylated arsenic can be found in virtually all earth surface environments. So far, however, little information has been collected regarding their removal by coagulation. In this study, the removal of monomethylarsenate (MMA) and dimethylarsenate (DMA) from drinking water by coagulation was investigated from the viewpoint of methyl substitution. Results indicated that FeCl3 was more efficient than AlCl3 and polyaluminum chloride (PACl) in methylated As removal. For the initial arsenic concentration of 200 μg/L, an FeCl3 dosage of 0.2 mmol Fe/L was sufficient to attain about 95% removal of MMA, while a dosage of 0.6 mmol Fe/L achieved about 57% removal of DMA. Arsenic removal efficiency was negatively correlated with the degree of methyl substitution. With the increase in methyl group number, the quantity of negatively charged arsenic species decreased and molecular size increased, leading to the decrease of methylated As removal by coagulation. Adsorption on preformed hydroxide flocs was the major mechanism during coagulation. Both FTIR and XPS results indicated that the As−O group of As might substitute the O−H group of Fe/Al hydroxide to form a Fe/Al−O−As complex. Furthermore, the use of traditional oxidants and coagulation aids exhibited limited help for improving coagulation removal of DMA.
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Affiliation(s)
- Chengzhi Hu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Qingxin Chen
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Huijuan Liu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jiuhui Qu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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21
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Zhang M, He G, Pan G. Binding mechanism of arsenate on rutile (110) and (001) planes studied using grazing-incidence EXAFS measurement and DFT calculation. CHEMOSPHERE 2015; 122:199-205. [PMID: 25496736 DOI: 10.1016/j.chemosphere.2014.11.053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 11/06/2014] [Accepted: 11/18/2014] [Indexed: 06/04/2023]
Abstract
Characterization of contaminant molecules on different exposed crystal planes is required to conclusively describe its behavior on mineral surfaces. Here, the structural properties and relative stability of arsenate adsorbed on rutile TiO2 (110) and (001) surfaces were investigated using grazing-incidence extended X-ray absorption fine structure (GI-EXAFS) spectra and periodic density functional theory (DFT) calculation. The combined results indicated that arsenate mainly formed inner-sphere bidentate binuclear (BB) and monodentate mononuclear (MM) complexes on both surfaces, but the orientational polar angles of arsenate on the (110) surface were commonly smaller than that on the (001) surface for the two adsorption modes. The DFT calculation showed that the (110) plane had a higher affinity toward arsenate than the (001) plane, suggesting that, for a given adsorption mode (i.e., MM or BB structure), a small polar angle was more favorable for arsenate stabilized on the rutile surfaces.
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Affiliation(s)
- Meiyi Zhang
- Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Guangzhi He
- Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Gang Pan
- Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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22
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Kersten M, Daus B. Silicic acid competes for dimethylarsinic acid (DMA) immobilization by the iron hydroxide plaque mineral goethite. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 508:199-205. [PMID: 25478657 DOI: 10.1016/j.scitotenv.2014.11.093] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 11/27/2014] [Accepted: 11/27/2014] [Indexed: 06/04/2023]
Abstract
A surface complexation modeling approach was used to extend the knowledge about processes that affect the availability of dimethylarsinic acid (DMA) in the soil rhizosphere in presence of a strong sorbent, e.g., Fe plaques on rice roots. Published spectroscopic and molecular modeling information suggest for the organoarsenical agent to form bidentate-binuclear inner-sphere surface complexes with Fe hydroxides similar to the inorganic As oxyanions. However, since also the ubiquitous silicic acid oxyanion form the same bidentate binuclear surface complexes, our hypothesis was that it may have an effect on the adsorption of DMA by Fe hydroxides in soil. Our experimental batch equilibrium data show that DMA is strongly adsorbed in the acidic pH range, with a steep adsorption edge in the circumneutral pH region between the DMA acidity constant (pKa=6.3) and the point of zero charge value of the goethite adsorbent (pHpzc=8.6). A 1-pK CD-MUSIC surface complexation model was chosen to fit the experimental adsorption vs. pH data. The same was done for silicic acid batch equilibrium data with our goethite adsorbent. Both model parameters for individual DMA and silicic acid adsorption were then merged into one CD-MUSIC model to predict the binary DMA+Si adsorption behavior. Silicic acid (500 μM) was thus predicted by the model to strongly compete for DMA with up to 60% mobilization of the latter at a pH6. This model result could be verified subsequently by experimental batch equilibrium data with zero adjustable parameters. The thus quantified antagonistic relation between DMA and silicic acid is discussed as one of factors to explain the increase of the DMA proportion in rice grains as observed upon silica fertilization of rice fields.
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Affiliation(s)
- Michael Kersten
- Geosciences Institute, Johannes Gutenberg-University, Mainz 55099, Germany
| | - Birgit Daus
- UFZ - Helmholtz Centre for Environmental Research, Department of Analytical Chemistry, Permoserstrasse 15, 04318 Leipzig, Germany
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23
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Adamescu A, Hamilton IP, Al-Abadleh HA. Density Functional Theory Calculations on the Complexation of p-Arsanilic Acid with Hydrated Iron Oxide Clusters: Structures, Reaction Energies, and Transition States. J Phys Chem A 2014; 118:5667-79. [DOI: 10.1021/jp504710b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Adrian Adamescu
- Department
of Chemistry, University of Waterloo, Waterloo, ON Canada N2L 3G1
| | - Ian P. Hamilton
- Department
of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON Canada N2L 3C5
| | - Hind A. Al-Abadleh
- Department
of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON Canada N2L 3C5
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24
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O'Neill A, Gupta BS, Phillips DH. Distribution of arsenic and risk assessment of activities on a golf course fertilised with arsenic-containing Ascophyllum nodosum seaweed. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 482-483:252-9. [PMID: 24657370 DOI: 10.1016/j.scitotenv.2014.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 02/25/2014] [Accepted: 03/02/2014] [Indexed: 06/03/2023]
Abstract
The use of seaweed fertilisers in sports green maintenance has become a common practice across the globe due to its image as an "eco-friendly" alternative to chemical fertilisers. The aim of this study was to characterise the risk of human exposure to arsenic (As), via dermal absorption, from golfing activities on a private golf course in the UK, where As contaminated seaweed fertiliser (~100mg/kg d.wt.) is applied. This was fulfilled by, 1) determining As concentrations in shallow soils with GIS geo-statistical analysis, 2) measuring As concentrations from an on-site borehole groundwater well, and (3) developing a risk assessment calculation for golfing activities based on field and questionnaire data. Total As concentrations in shallow soils were less than the UK threshold for domestic soils, however, frequent and sustained dermal contact between site-users and surface soil attributed to a maximum carcinogenic risk value of 2.75×10(-4), which is in the upper limit of the acceptable risk range. Arsenic concentrations in underlying groundwater exceeded the WHO's permissible drinking water standard, demonstrating the risk of groundwater contamination following the application of seaweed fertiliser to golf course soils. This is the first risk study on dermal As absorption via the application of a seaweed fertiliser.
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Affiliation(s)
- Antonia O'Neill
- Environmental Engineering Research Centre, School of Planning, Architecture and Civil Engineering, Queen's University of Belfast, Belfast BT9 5AG, Northern Ireland, UK
| | - Bhaskar Sen Gupta
- Environmental Engineering Research Centre, School of Planning, Architecture and Civil Engineering, Queen's University of Belfast, Belfast BT9 5AG, Northern Ireland, UK.
| | - Debra H Phillips
- Environmental Engineering Research Centre, School of Planning, Architecture and Civil Engineering, Queen's University of Belfast, Belfast BT9 5AG, Northern Ireland, UK
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25
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An EXAFS study on the adsorption structure of phenyl-substituted organoarsenic compounds on ferrihydrite. J Colloid Interface Sci 2014; 415:13-7. [DOI: 10.1016/j.jcis.2013.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Revised: 10/08/2013] [Accepted: 10/10/2013] [Indexed: 11/21/2022]
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26
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Arts D, Abdus Sabur M, Al-Abadleh HA. Surface Interactions of Aromatic Organoarsenical Compounds with Hematite Nanoparticles Using ATR-FTIR: Kinetic Studies. J Phys Chem A 2013; 117:2195-204. [DOI: 10.1021/jp311569m] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Derek Arts
- Chemistry Department, Wilfrid Laurier University, Waterloo, ON N2L 3C5 Canada
| | - Md Abdus Sabur
- Chemistry Department, Wilfrid Laurier University, Waterloo, ON N2L 3C5 Canada
| | - Hind A. Al-Abadleh
- Chemistry Department, Wilfrid Laurier University, Waterloo, ON N2L 3C5 Canada
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27
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D'Angelo E, Zeigler G, Beck EG, Grove J, Sikora F. Arsenic species in broiler (Gallus gallus domesticus) litter, soils, maize (Zea mays L.), and groundwater from litter-amended fields. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 438:286-292. [PMID: 23010102 DOI: 10.1016/j.scitotenv.2012.08.078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 08/21/2012] [Accepted: 08/21/2012] [Indexed: 06/01/2023]
Abstract
Manure and bedding material (litter) generated by the broiler industry (Gallus gallus domesticus) often contain high levels of arsenic (As) when organoarsenical roxarsone and p-arsanilic acid are included in feed to combat disease and improve weight gain of the birds. This study was conducted to determine As levels and species in litter from three major broiler producing companies, and As levels in soils, corn tissue (Zea mays L.), and groundwater in fields where litter was applied. Total As in litter from the three different integrators ranged between <1 and 44 mg kg(-1). Between 15 and 20% of total As in litter consisted of mostly of arsenate, with smaller amounts of roxarsone and several transformation products that were extractable with phosphate buffer. Soils amended with litter had higher levels of bioavailable As (extractable with Mehlich 3 solution and taken up by corn leaves). Arsenic concentrations in plant tissue and groundwater, however, were below the World Health Organization thresholds, which was attributed to strong sorption/precipitation of arsenate in Fe- and Al-rich soils. Ecological impacts of amending soils with As-laden litter depend on the As species in the litter, and chemical and physical properties of soil that strongly affect As mobility and bioavailability in the environment.
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Affiliation(s)
- Elisa D'Angelo
- University of Kentucky, N-122 Agricultural Science Building North, Lexington, KY 40546, United States.
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28
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Tofan-Lazar J, Al-Abadleh HA. Kinetic ATR-FTIR Studies on Phosphate Adsorption on Iron (Oxyhydr)oxides in the Absence and Presence of Surface Arsenic: Molecular-Level Insights into the Ligand Exchange Mechanism. J Phys Chem A 2012; 116:10143-9. [DOI: 10.1021/jp308913j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Julia Tofan-Lazar
- Chemistry Department, Wilfrid Laurier University, Waterloo,
ON N2L 3C5, Canada
| | - Hind A. Al-Abadleh
- Chemistry Department, Wilfrid Laurier University, Waterloo,
ON N2L 3C5, Canada
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29
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Tofan-Lazar J, Al-Abadleh HA. ATR-FTIR studies on the adsorption/desorption kinetics of dimethylarsinic acid on iron-(oxyhydr)oxides. J Phys Chem A 2012; 116:1596-604. [PMID: 22257280 DOI: 10.1021/jp210093n] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dimethylarsinic acid (DMA) is an organoarsenical compound that, along with monomethylarsonic acid, poses a health and an environmental risk, and a challenge to the energy industry. Little is known about the surface chemistry of DMA at the molecular level with materials relevant to geochemical environments and industrial sectors. We report herein the first in situ and surface-sensitive rapid kinetic studies on the adsorption and desorption of DMA to/from hematite and goethite at pH 7 and I = 0.01 M KCl using ATR-FTIR. Values for the apparent rates of adsorption and desorption were extracted from experimental data as a function of spectral components, flow rate of the aqueous phase, film thickness of hematite, and using chloride and hydrogen phosphate as desorbing agents. The adsorption kinetic data show fast and slow rates, consistent with the formation of more than one type of adsorbed DMA. Apparent adsorption and desorption rate constants were extracted from the dependency of the initial adsorption rates on [DMA(aq)]. Desorption rate constants were also extracted from desorption experiments using hydrogen phosphate and chloride solutions, and were found to be higher by 1-2 orders of magnitude than those using chloride. In light of the complex ligand exchange reaction mechanism of DMA desorption by phosphate species at pH 7, apparent desorption rate constants were found to depend on [hydrogen phosphate] with an order of 0.3. The impact of our studies on the environmental fate of DMA in geochemical environments, and the design of technologies to reduce arsenic content in fuels is discussed.
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Affiliation(s)
- Julia Tofan-Lazar
- Chemistry Department, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
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Adamescu A, Hamilton IP, Al-Abadleh HA. Thermodynamics of dimethylarsinic acid and arsenate interactions with hydrated iron-(oxyhydr)oxide clusters: DFT calculations. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:10438-10444. [PMID: 22029696 DOI: 10.1021/es202749h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Dimethylarsinic Acid (DMA) belongs to an important class of organoarsenical compounds commonly detected in arsenic speciation studies of environmental samples and pyrolysis products of fossil fuels. Transformation of DMA under certain conditions leads to the formation of other forms of arsenic, which could be more toxic than DMA to biota, and more efficient in deactivating catalysts used in petrochemical refining. Published surface sensitive X-ray and infrared spectroscopic work suggested that DMA simultaneously forms inner- and outer-sphere complexes with iron-(oxyhydr)oxides. Computational work on the complexation of arsenicals with various surfaces of environmental and industrial interest provides useful information that aids in the interpretation of experimental spectroscopic data as well as predictions of thermodynamic favorability of surface interactions. We report herein Gibbs free energies of adsorption, ΔG(ads), for various ligand exchange reactions between hydrated complexes of DMA and Fe-(oxyhydr)oxide clusters calculated using density functional theory (DFT) at the B3LYP/6-311+G(d,p) level. Calculations using arsenate were also performed for comparison. Calculated As-(O,Fe) distances and stretching frequencies of As-O bonds are also reported for comparison with experimental spectroscopic data. Gibbs free energies of desorption, ΔG(des), due to reactions with phosphorus species at pH 7 are reported as well. Our results indicate that the formation of both inner- and outer-sphere DMA complexes is thermodynamically favorable, with the former having a more negative ΔG(ads). Values of ΔG(des) indicate that desorption favorability of DMA complexes increases in this order: bidentate < mondentate < outersphere. The significance of our results for the overall surface complexation mechanism of DMA is discussed.
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Affiliation(s)
- Adrian Adamescu
- Chemistry Department, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5 Canada
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Shimizu M, Arai Y, Sparks DL. Multiscale assessment of methylarsenic reactivity in soil. 2. Distribution and speciation in soil. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:4300-6. [PMID: 21488669 PMCID: PMC3113541 DOI: 10.1021/es103577e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Methylated forms of arsenic (As), monomethylarsenate (MMA) and dimethylarsenate (DMA), have historically been used as herbicides and pesticides. Because of their large application to agriculture fields and the toxicity of MMA and DMA, the distribution, speciation, and sorption of methylated As to soils requires investigation. Monomethylarsenate and DMA were reacted with a soil up to one year under aerobic and anaerobic conditions. Microsynchrotron based X-ray fluorescence (μ-SXRF) mapping studies showed that MMA and DMA were heterogeneously distributed in the soil and were mainly associated with iron oxyhydroxides, e.g., goethite, in the soil. Micro-X-ray absorption near edge structure (XANES) spectra collected from As hotspots showed MMA and DMA were demethylated to arsenate over one year incubation under aerobic conditions. Monomethylarsenate was methylated to DMA, and DMA was maintained as DMA over a 3 month incubation under anaerobic conditions. Arsenic-iron precipitation, such as the formation of scorodite (FeAsO(4)·2H(2)O), was not observed, indicating that MMA and DMA were mainly associated with Fe-oxyhydroxides as sorption complexes.
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Affiliation(s)
- Masayuki Shimizu
- Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19713, USA.
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