Environmental fate of monosodium methanearsonate (MSMA)—Part 1: Conceptual model

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.4961

Michal Eldan, Yoko Masue-Slowey

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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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甲烷胂酸钠（MSMA）的环境归宿--第 1 部分：概念模型。

甲胂酸钠（MSMA）是单甲基胂酸（MMA）的钠盐，是一种选择性广谱接触型除草剂，用于控制棉花和各种草皮中的杂草。在水中，MSMA 会解离成钠离子（Na+）和 MMA- 离子，后者是除草剂的活性成分。某些土壤微生物可将 MMA 甲基化为二甲基砷酸 (DMA)，而其他微生物则可将 MMA 脱甲基化为无机砷 (iAs)。为了预测施用 MSMA 可能导致的地下水 iAs 浓度，必须对影响 MSMA 环境行为的过程进行量化和建模。关于 MSMA 的环境行为有大量文献。科学家们一致认为，甲基丙烯酸甲酯在土壤中的归宿受微生物活动和固体表面吸附作用的控制，而 iAs 的吸附作用甚至比甲基丙烯酸甲酯更为广泛。MMA 及其代谢物的吸附和转化受多种因素的影响，包括通气条件、温度、pH 值和养分的供应。这些过程的确切性质和程度因具体地点的条件而异；不过，在高度管理的典型 MSMA 使用区，这种可变性受到限制。单甲基胂酸会被强烈吸附在矿物表面，并固着在土壤基质中。随着时间的推移，更多的甲基丙烯酸甲酯（MMA）和碘胂酸（iAs）变得不可移动，无法被土壤微生物和沥滤利用。本综述综合了与用作除草剂的 MSMA 行为相关的研究结果，以可靠地预测 MSMA 在使用条件下的归宿。Integr Environ Assess Manag 2024;00:1-17。© 2024 The Author(s).综合环境评估与管理》由 Wiley Periodicals LLC 代表环境毒理学与化学学会 (SETAC) 出版。

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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.