Sorption-desorption of imidacloprid and its metabolites in soil and vadose zone materials.
Sorption-desorption of imidacloprid and its metabolites in soil and vadose zone materials.
复制标题
吡虫啉及其代谢物在土壤和包气带材料中的吸附-解吸。
DOI：
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发表时间：
2006
影响因子：
6.1
通讯作者：
K. A. Norberg
中科院分区：
文献类型：
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作者：
S. Papiernik;W. C. Koskinen;L. Cox;P. J. Rice;S. Clay;N. R. Werdin;K. A. Norberg
吸附-解吸是影响农药通过土壤沥滤的最重要过程之一，因为它控制了可供运输的农药量。次表层土壤的特性可对农药的迁移和地下水污染的可能性产生重大影响。本研究对吡虫啉的吸附-解吸进行了表征（1-[（6-氯-3-吡啶基）-甲基]-N-硝基-2-咪唑烷亚胺）及其三种代谢产物1-[（6-氯-3-吡啶基）甲基]-2-咪唑啉酮（吡虫啉-尿素），1-[（6-氯-3-吡啶基）甲基]-4，5-二氢-1H-咪唑-2-胺（吡虫啉-胍）和1-[（6-氯-3-吡啶基）甲基]-1H-咪唑-2-胺（吡虫啉-胍-烯烃），作为从地表延伸到1.8或8 m深度的两个剖面中随深度变化的土壤性质的函数。在所有情况下，每种化合物的吸附是高度可变的和滞后的。归一化的吸附系数（K（f））的有机碳或粘土含量的土壤没有减少任何化合物的吸附系数的变异。这些结果说明了用于预测潜在流动性的吸附数据的评价的重要性。了解土壤性质和过程的变化作为深度的函数是必要的准确预测农药的消散。
Sorption-desorption is one of the most important processes affecting the leaching of pesticides through soil because it controls the amount of pesticide available for transport. Subsurface soil properties can significantly affect pesticide transport and the potential for groundwater contamination. This research characterized the sorption-desorption of imidacloprid (1-[(6-chloro-3-pyridinyl)-methyl]-N-nitro-2-imidazolidinimine) and three of its metabolites, 1-[(6-chloro-3-pyridinyl)methyl]-2-imidazolidinone (imidacloprid-urea), 1-[(6-chloro-3-pyridinyl)methyl]-4,5-dihydro-1H-imidazol-2-amine (imidacloprid-guanidine), and 1-[(6-chloro-3-pyridinyl)methyl]-1H-imidazol-2-amine (imidacloprid-guanidine-olefin), as a function of changing soil properties with depth in two profiles extending from the surface to a depth of 1.8 or 8 m. Sorption of each compound was highly variable and hysteretic in all cases. Normalizing the sorption coefficients (K(f)) to the organic carbon or the clay content of the soil did not reduce the variability in sorption coefficients for any compound. These results illustrate the importance of evaluation of the sorption data used to predict potential mobility. Understanding the variability of soil properties and processes as a function of depth is necessary for accurate prediction of pesticide dissipation.