The sorption, desorption, and mobility of microencapsulated chlorpyrifos (CPF-MC) in two typical soils, namely, silt loam and sandy, were investigated in this study. Sorption/desorption experiments were carried out by using the batch equilibration method. Results showed that the sorption isotherms of CPF-MC and emulsifiable concentrate of chlorpyrifos (CPF-EC) in silt loamy soil were similar. However, a considerable difference was observed in the sorption isotherms of two chlorpyrifos (CPF) formulations in sandy soil. The amounts of CPF desorbed from two soils in four desorption steps decreased sequentially in CPF-EC treatments, while the desorbed amounts remained stable in CPF-MC treatments. Hence, the sorption/desorption processes of CPF-EC were mainly controlled by soil affinity to CPF. However, these processes of CPF-MC were affected by the release rate of CPF from capsules. The mobility of two CPF formulations in soil was estimated in vertical columns packed with soils. Results showed that there was leaching of CPF-EC in silt loam column, whereas CPF-MC was not vertically mobile in silt loam column under the same leaching conditions. However, in column with sandy soil, the percentage of CPF-MC leaching from the column was 86.54%, which was higher than the 73.75% that leached from the column in the treatment with CPF-EC.

本研究研究了微囊毒死蜱（CPF-MC）在粉砂壤土和沙质两种典型土壤中的吸附、解吸和迁移。吸附/解吸实验采用分批平衡法进行。结果表明，CPF-MC和毒死蜱乳油(CPF-EC)在粉质壤土中的吸附等温线相似。然而，在沙质土壤中，两种毒死蜱 (CPF) 制剂的吸附等温线存在相当大的差异。在 CPF-EC 处理中，通过四个解吸步骤从两种土壤中解吸的 CPF 量依次减少，而在 CPF-MC 处理中解吸量保持稳定。因此，CPF-EC 的吸附/解吸过程主要受土壤对 CPF 的亲和力控制。然而，CPF-MC的这些过程受胶囊中CPF释放速率的影响。两种 CPF 制剂在土壤中的流动性是在装满土壤的垂直柱中估算的。结果表明，在相同的浸出条件下，CPF-EC在粉砂壤土柱中发生浸出，而CPF-MC在粉砂壤土柱中没有垂直移动。而在沙土柱中，CPF-MC从柱中浸出的百分比为86.54%，高于CPF-EC处理从柱中浸出的73.75%。