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试验采用同位素示踪技术,研究了~(14)C-氰戊菊酯(速灭菊酯,速灭杀丁)在土壤表层和玉米叶片中的消失、迁移和降解.结果表明,与其它的一些拟除虫菊酯类农药相似,氰戊菊酯在旱地土壤中不发生明显的迁移,处理后25天迁移至土表2cm以下的放射性只占原始处理量的8％,氰戊菊酯在土壤中的残留性较强,在玉米植株中则消失较快,在玉米植株中,氰戊菊酯基本上停留在处理部位,而从其它部分检测到的残留极少,植株对土壤中的残留物摄取量甚微,在试验土壤中,检出了除亲体氰戊菊酯以外的几种降解产物,籍此提出了氰戊菊酯在旱地土壤中可能存在的降解途径。
The isotope tracing technique was used to study the disappearance, migration and degradation of ~ (14) C-fenvalerate (trichosanthin and imazethapyr) in soil surface and maize leaves.The results showed that, In some pyrethroid pesticides, fenvalerate did not migrate significantly in upland soils, and the radioactivity that migrated to sub-2 cm 25 days after treatment accounted for only 8% of the original treatment, and fenvalerate in soil Remained strong in maize plants but disappeared rapidly in maize plants. In corn plants, fenvalerate remained basically on the treated area, while few residues were detected from other parts and the plant uptake of residues in the soil In the test soils, several degradation products other than the parent fenvalerate were detected. Therefore, possible degradation pathways of fenvalerate in dry soil were proposed.