The Transport and Fate of 14C-cypermethrin in A Microcosm under the Laboratory Conditions
14C-氯氰菊酯农药在“微宇”环境中的迁移、归宿

The aim of the experiments is to study mass balance of 14C~cypermethrin in a close ecosystem by observing metabolism, degradation and distribution of the pesticide. The microcosm was set up in a 30 cm-desiccator with 15 one-week-old maize plants and 15 earthworms (Eiscnia foetida) in the sandy loam soil containing 5.5ppm pure 14C-cypermethrin.The results indicated that cypermethrin residues was absorbed in the maize roots, but very little was to be migrated to the leaves. After two weeks, the mafor product in the maize plants was the bound compounds which contained 81.81%; the armount of metabolic products in the earthworms was 72.40%; parent of cyper-methrin in soil 68.74%. In soil main product 3-phenoxy-benzaldehyde was degraded by splitting of chain easter and 4'-methoxy-compound was formed by hydroxylation and methoxylation at 4'-carbon atom.