甲烷胂酸钠（MSMA）的环境归宿--第 2 部分：螯合和转化模型。

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Integrated Environmental Assessment and Management Pub Date : 2024-06-25 DOI:10.1002/ieam.4962

W. Martin Williams, J. Mark Cheplick, Stuart Z. Cohen, Michal Eldan, Cornelis G. Hoogeweg, Yoko Masue-Slowey, Raghu Vamshi

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引用次数: 0

摘要

甲胂酸钠（MSMA）是单甲基胂酸（MMA）的钠盐，是一种选择性接触除草剂，用于控制多种杂草。在水中，MSMA 会解离成钠（Na+）离子和单甲基胂酸（MMA-）离子，这种离子很稳定，不会发生非生物转化。在具有使用 MSMA 特性的土壤中，会同时发生几个过程：(1) 微生物将 MMA 甲基化为二甲基砷酸 (DMA)，(2) 微生物将 MMA 去甲基化为无机砷 (iAs)，(3) 将 iAs 甲基化为 MMA，(4) MMA 及其代谢物吸附并固着在土壤矿物中。螯合残留物是指在环境条件下无法从土壤中解吸的残留物。在施用 MSMA 后的最初几天，固着速度很快，随着时间的推移，固着速度逐渐减慢。一旦被螯合，MMA 及其代谢物就无法被土壤微生物所利用，也无法被转化。MMA 及其代谢物的吸附和固着速度和程度以及流动性取决于当地的土壤条件。在典型的 MSMA 使用区，土壤环境条件的可变性受到限制。本研究的目标是利用美国环境保护局为农药风险评估开发的模型和方案，估算因使用 MSMA 而可能添加到饮用水中的 iAs 数量。在该项目中，iAs 的估计饮用水浓度（EDWCs）被评估为 30 年模拟期间水库中的平均浓度，每年以最大标签率施用 MSMA。当假定适宜土地的总面积得到处理时，EDWCs 的范围为

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Environmental fate of monosodium methanearsonate (MSMA)—Part 2: Modeling sequestration and transformation

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Environmental fate of monosodium methanearsonate (MSMA)—Part 2: Modeling sequestration and transformation

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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来源期刊

Integrated Environmental Assessment and Management ENVIRONMENTAL SCIENCESTOXICOLOGY&nbs-TOXICOLOGY

CiteScore

5.90

自引率

6.50%

发文量

156

期刊介绍： Integrated Environmental Assessment and Management (IEAM) publishes the science underpinning environmental decision making and problem solving. Papers submitted to IEAM must link science and technical innovations to vexing regional or global environmental issues in one or more of the following core areas: Science-informed regulation, policy, and decision making Health and ecological risk and impact assessment Restoration and management of damaged ecosystems Sustaining ecosystems Managing large-scale environmental change Papers published in these broad fields of study are connected by an array of interdisciplinary engineering, management, and scientific themes, which collectively reflect the interconnectedness of the scientific, social, and environmental challenges facing our modern global society: Methods for environmental quality assessment; forecasting across a number of ecosystem uses and challenges (systems-based, cost-benefit, ecosystem services, etc.); measuring or predicting ecosystem change and adaptation Approaches that connect policy and management tools; harmonize national and international environmental regulation; merge human well-being with ecological management; develop and sustain the function of ecosystems; conceptualize, model and apply concepts of spatial and regional sustainability Assessment and management frameworks that incorporate conservation, life cycle, restoration, and sustainability; considerations for climate-induced adaptation, change and consequences, and vulnerability Environmental management applications using risk-based approaches; considerations for protecting and fostering biodiversity, as well as enhancement or protection of ecosystem services and resiliency.