中文摘要：

Bioavailability 是为在土壤估计器官的污染物质的环境风险的一个关键因素。在这研究，有 3 不同溶剂的抽取包括 2 个水的答案，钙氯化物( CaCl ₂)和一个磷酸盐缓冲区答案( PBS )，和水的答案和器官的溶剂的混合物，PBS甲醇( 8:2 ，卷/卷)混合( PBS-M )，被执行与小麦幼苗的一组毒性测试相比在土壤估计chlorimuron乙醇的 bioavailability 。在暴露的 7 d 是在土壤的 chlorimuron 乙醇的敏感 biomarkers 之一以后，结果显示在小麦的 peroxidase (邮政部门) 活动离开。由所有 3 溶剂的 chlorimuron 乙醇的 extractability 与暴露时间减少了，并且在暴露的 1 和 7 d 之间的 PBS-M 抽取的减少的率比水的答案抽取的那些实质地高。逐渐地从一种水溶性的形式变成土壤有机物(SOM ) 的 Chlorimuron 乙醇在土壤绑了形式。PBS 抽取在暴露的 7 d 以后在叶子与 POD 活动最好相关。

英文摘要：

Bioavailability is a critical factor for assessing the environmental risk of organic pollutants in soil. In this study, extractions with 3 different solvents, including 2 aqueous solutions, calcium chloride（CaCl2） and a phosphate buffer solution（PBS）, and a mixture of aqueous solution and organic solvent, a PBS-methanol（8：2,volume/volume） mixture（PBS-M）, were performed to assess the bioavailability of chlorimuron-ethyl in soil in comparison to a battery of toxicity tests in wheat seedlings. The results indicated that the peroxidase（POD） activity in wheat leaves after 7 d of exposure was one of the sensitive biomarkers of chlorimuron-ethyl in soil.The extractability of chlorimuron-ethyl by all the 3 solvents decreased with exposure time, and the rate of decrease of the PBS-M extraction between 1 and 7 d of exposure was substantially higher than those of the aqueous solution extractions. Chlorimuron-ethyl gradually changed from a water-soluble form into a soil organic matter（SOM）-bound form in the soil. The PBS extraction correlated best with the POD activity in the leaves after 7 d of exposure.