살균제 Procymidone의 토양 중 동태
Behaviors of the Fungicide Procymidone in Soils
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초록
살균제 procymidone의 토양 중 행적에 관한 흡탈착, 용탈실험과 광분해 및 가수분해 실험을 통한 농업환경 중 동태를 구명코자 하였으며, 그 결과는 다음과 같다. 흡착은 직선식과 Freundlich식에 부합하였고, 분배계수는 2.75～12.18, Kf값은 1.99～9.98로 토양유기물 함량에 비례하였다. 토양별 탈착율은 백산>지곡>남계통의 순서로 높게 나타났다. 자연광 하에서의 광분해는 느려 자연광에 의한 직접적인 분해는 적을 것으로 사료되었으며, 용탈 이동성은 낮아 Macall총설 및 SSLRC 이동성 분류에 따라 low class에 속했고 특히 유기물 함량이 높은 남계통은 2주 경과후에도 농약이 용탈되지 않았다. 가수분해 실험결과 procymidone은 산성 및 중성보다 알칼리 조건에서 가수분해가 빨랐으며, 높은 온도에서 분해가 빨랐다. 이상의 결과 procymidone은 토양환경에서 흡착량이 높고 이동성이 낮아 타 환경계로의 전이 정도는 매우 낮다고 평가되었다.
Abstract
This study was focused on adsorption, leaching, photolysis, and hydrolysis of the fungicide procymidone in soils. Adsorption type of procymidone on three different soil were well fitted to Linear and Freundlich isotherm. Distribution coefficients (Kd) were ranged from 2.75 to 12.18 and Freundlich isotherm Kf value 1.99～9.98, 1/n value 0.74～0.89. Desorption rates were 20.1～34.0% (Namgye), 26.3～44.6% (Jigog) and 31.6～50.9% (Baegsan series) and desorption hysteresis were 0.65～0.79, 0.55～0.73 and 0.49～0.68. Procymidone seemed to be stable to photolysis in acidic and neutral solutions but hydrolyzed rapidly in alkaline solution. Considering leaching properties procymidone mobility low in soils.
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