Evolution of Carbofuran in Soils Treated with Its Aminothio Derivatives, Carbosulfan, Furathiocarb and Benfuracarb

Carbosulfan, Furathiocarb 및 Benfuracarb 처리토양중 Carbofuran 방출특성

Three aminothio derivatives of carbofuran including carbosulfan, furathiocarb and benfuracarb were subjected to the degradation study in soils to investigate how fast and efficiently carbofuran would be evolved from them. Carbofuran was rapidly released from the derivatives in soils as the carbamoyl nitrogen-sulfur bond cleaved. Their degradation rates in soils, with half-lives of $23{\sim}68$ hours, were largely affected by structures of aminothio moieties and soil moisture conditions. Conversion rates into carbofuran ranged from 64 to 84% in soils on the basis of parent compounds 5 days after treatment. Application of aminothio derivatives led to less drastic increase in the carbofuran level in soils than when carbofuran was applied as such, and hence this might result in lower side effects in situ.

Carbofuran의 aminothio 유도체로서 국내에서 사용되고 있는 살충제들인 carbosulfan, furathiocarb 및 benfuracarb를 논 및 밭상태 수분조건별로 토양에 처리하고 토양중 분해양상 및 carbofuran 방출 특성을 조사하였다. 토양에 처리한 유도체들은 토양중에서 carbamoyl N-S간 결합의 붕괴에 따라 carbofuran을 빠른 속도로 방출하였다. 토앙중 분해반감기는 $23{\sim}68$시간 범위로서 유도체 측쇄구조 및 토양수분조건에 영향을 받는 것으로 나타났다. 토양 처리 5일후 유도체농약들의 carbofuran으로의 유효전환율은 $64{\sim}84%$ 범위였으며 유도체형태로의 처리는 carbofuran 직접처리에 비하여 토양중 carbofuran 전류수준의 급격한 상승을 완화, 직접살포에 따른 부작용을 경감시킬 수 있을 것으로 판단되었다.