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首页> 外文期刊>Environmental Science & Technology >Ability of the MACRO Model to Predict Long-Term Leaching of Metribuzin and Diketometribuzin
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Ability of the MACRO Model to Predict Long-Term Leaching of Metribuzin and Diketometribuzin

机译：MACRO模型预测Metribuzin和Diketometribuzin长期浸出的能力

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摘要

In a regulatory context, numerical models are increasingly employed to quantify leaching of pesticides and their metabolites. Although the ability of these models to accurately simulate leaching of pesticides has been evaluated, little is known about their ability to accurately simulate long-term leaching of metabolites. A Danish study on the dissipation and sorption of metribuzin, involving both monitoring and batch experiments, concluded that desorption and degradation of metribuzin and leaching of its primary metabolite diketometribuzin continued for 5-6 years after application, posing a risk of groundwater contamination. That study provided a unique opportunity for evaluating the ability of the numerical model MACRO to accurately simulate long-term leaching of metribuzin and diketometribuzin. When calibrated and validated with respect to water and bromide balances and applied assuming equilibrium sorption and first-order degradation kinetics as recommended in the European Union pesticide authorization procedure, MACRO was unable to accurately simulate the long-term fate of metribuzin and diketometribuzin; the concentrations in the soil were underestimated by many orders of magnitude. By introducing alternative kinetics (a two-site approach), we captured the observed leaching scenario, thus underlining the necessity of accounting for the long-term sorption and dissipation characteristics when using models to predict the risk of groundwater contamination.
机译：在监管背景下，越来越多地使用数值模型来量化农药及其代谢产物的浸出。尽管已评估了这些模型精确模拟农药浸出的能力，但对它们精确模拟代谢物长期浸出的能力知之甚少。丹麦对metribuzin耗散和吸附的研究（包括监测和分批实验）得出结论，在施用后，metribuzin的解吸和降解以及其主要代谢产物diketometribuzin的浸出持续了5-6年，存在地下水污染的风险。该研究为评估数值模型MACRO准确模拟美特津和双酮美津的长期浸出提供了独特的机会。当按照欧盟农药批准程序的建议对水和溴化物的平衡进行校准和验证并假设平衡吸附和一级降解动力学进行应用时，MACRO无法准确地模拟美法津和双酮美津的长期命运。土壤中的浓度被低估了多个数量级。通过引入替代动力学（两点方法），我们捕获了观察到的浸出情况，从而强调了在使用模型预测地下水污染风险时需要考虑长期吸附和耗散特征的必要性。

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  • 来源
    《Environmental Science & Technology》 |2009年第9期|3221-3226|共6页
  • 作者

    ANNETTE E. ROSENBOM; JEANNE KJER; TRINE HENRIKSEN; MARLENE ULLUM; PREBEN OLSEN;

  • 作者单位

    Geological Survey of Denmark and Greenland, Oster Voldgade 10, DK-1350 Copenhagen, Denmark;

    Geological Survey of Denmark and Greenland, Oster Voldgade 10, DK-1350 Copenhagen, Denmark;

    Faculty of Agricultural Sciences, Department of Agroecology and Environment, Aarhus University, P.O. Box 50, DK-8830 Tjele, Denmark;

    COWI A/S, Parallelvej 2, DK-2800 Kongens Lyngby, Denmark;

    Department of Clinical Pharmacology, Rigshospitalet, Blegdamsvej 9, DK-2100 Copenhagen O, Denmark;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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