It is important to evaluate leaching behavior in agricultural soils to prevent the pollution of groundwater by pesticides. We identified the distribution coefficients (Kd) of ten pesticides with different physicochemical properties and compared their leaching characteristics using wick lysimeters from three distinct soil types on Jeju Island. The Kd values varied by pesticide and soil, but were within the range of 1.2 to 4231 L kg−1. Based on the European standard (Kd < 10 L kg−1), six pesticides (alachlor, ethoprophos, carbofuran, napropamide, tebuconazole, and etridiazole) were mobile in at least one tested soil, and their soil organic carbon affinity was ≤ 5.811. This value differed greatly from the other pesticides (16.533 and higher). The solubility of the six mobile pesticides was ≥ 32 mg L−1, which substantially differed from the other pesticides (≤ 0.71 mg L−1). Thus, we conclude that our mobility assessment, which is based on Kd values, can be used to predict the leaching of pesticides in the volcanic ash soils of Jeju Island. The use of pesticides should be strictly controlled to reduce the possibility of groundwater contamination.

中文翻译：

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韩国济州岛火山灰土壤中农药的吸附和浸出特性

重要的是评估农业土壤中的浸出行为，以防止农药污染地下水。我们确定了十种具有不同理化特性的农药的分布系数（Kd），并使用了济州岛上三种不同土壤类型的威克测渗仪对它们的浸出特性进行了比较。Kd值因农药和土壤而异，但在1.2至4231 L kg-1之间。根据欧洲标准（Kd <10 L kg-1），六种农药（甲草胺，乙草胺，碳呋喃，萘丙酰胺，戊唑醇和乙二唑）可在至少一种被测土壤中移动，其土壤有机碳亲和力≤5.811。该值与其他农药（16.533和更高）有很大差异。六种流动农药的溶解度≥32 mg L-1，与其他农药（≤0.71 mg L-1）有很大不同。因此，我们得出结论，我们基于Kd值的迁移率评估可用于预测济州岛火山灰土壤中农药的浸出。应严格控制农药的使用，以减少地下水污染的可能性。