Degradation of Dinobuton in Soil and Solution

Dinobuton의 토양(土壤) 및 용액중(溶液中)에서 분해(分解)

This study was carried out to investigate the stability of dinobuton (2-sec-butyl-4,6-dinitrophenyl isopropyl carbonate) in distilled water and buffer solutions and its persistence in soils. When dinobuton was incubated at $30^{\circ}C$ and $60^{\circ}C$ in distilled water, the half-lives of dinobuton was 28 and 6 days, respectively. The decomposition of dinobuton was, therefore, faster at high temperature than at low temperature. The half-life of dinobuton was about 27 days in the acidic solution $(pH\; 4{\sim}6)$, whereas 10 and 4 days in the alkaline solutions of pH 9, and 10, respectively. Thus dinobuton was stable in acidic solution, and unstable in alkaline solution. Dinoseb (2-sec-butyl-4,6-dinitrophenol), which is produced in the degradation process of dinobuton, was produced in small amounts in distilled water and buffer solutions. The half-life of dinobuton in sterilized soil was about 16 days longer than in non-sterilized soil. Dinoseb was also more persistent in sterilized soil than in non-sterilized one.

용액(溶液) 내(內)에서 dinobuton의 분해(分解)에 미치는 온도(溫度)와 pH의 영향(影響) 및 토양중(土壤中)에서의 분해양상(分解樣相)을 조사(調査)한 결과(結果)는 다음과 같다. 증류수(蒸溜水) 내(內)에서 dinobuton의 반감기(半減期)는 $30^{\circ}C$와 $60^{\circ}C$에서 각각(各各) 27일(日)과 6일(日)이었다. 산성(酸性)인 완충용액중(中)에서 dinobuton의 반감기(半減期)는 약(約) 27일(日)이었으나 pH가 9,10에서는 각각 10일(日), 4일(日)로 alkali성(性)이 강(强)할수록 dinobuton의 분해(分解)는 빨랐다. 증류수(蒸溜水)와 완충용액 내(內)에서는 dinobuton이 가수분해(加水分解) 되어서 소량(少量)의 dinoseb가 생성(生成)되었다. Dinobuton의 분해(分解)에 미치는 토양미생물(土壤微生物)의 영향(影響)을 조사(調査)한 결과(結果), 살균토양(殺菌土壤)에서는 무살균토양(無殺菌土壤)에서 보다 dinobuton의 반감기(半減期)가 약 16일(日) 지연(遲延)되었으며, dinobuton의 분해생성물(分解生成物)인 dinoseb도 살균토양(殺菌土壤)에서 분해(分解)가 지연(遲延)되었다.