The Adsorption of N-methylcarbamate Insecticides on Soils

N-methlycarbamate 계(系) 살충제의 토양중(土壤中) 흡착(吸着)

Adsorption experiments of N-methylcarbamate insecticides on soils were carried out as a function of soil pH ana soil organic matter content with wet-and dry-land soils that were either oxidized or non-oxidized. The results obtained may be summarized as follows: The adsorption of N-methylcarbamate insecticides on soils was nearly leached to equilibrium after shaking for 12 hours. The adsorption of N-methylcarbamate insecticides was higher on sandy clay than sandy loam. The presence of organic matter in soil increased the adsorption of N-methrlcarbamate insecticides on soils. The mode of isothermal adsorption of N-methylcarbamate insecticides on soils was coincident with the Freundlich equation. Little effect of soil pH on the adsorption might be interpreted as that the adsorption was due to physical adsorption between N-methylcarbamate molecules and soil surface.

두가지 성질(性質)이 다른 토양(土壤)과 이들에 과산화수소(過酸化水素)를 처리(處理)하여 유기물(有機物)을 분해(分解)시킨 후 N-methylcarbamte 계(系) 농약(農藥)과의 흡착실험(吸着實驗)을 습식진탕법으로 행(行)한 결과(結果) 다음과 같다. N-methylacrbamate계(系) 농약(農藥)은 12시간(時間)의 진탕으로 평충농도(平衝濃度)에 도달(到達)하였다. 또한 토성별(土性別)로는 sandy clay가 sandy loam보다 N-methylcarbamate계농약(系農藥)을 더 많이 흡착(吸着)하는 것으로 나타났다. 유기물(有機物) 함량(含量)을 달리했을 때 N-methylcarbamate계농약(系農藥)의 흡착(吸着)은 유기물함량(有機物含量)에 상당한 영향(影響)이 있음이 나타났다. N-methylcarbamate계(系) 농약(農藥)의 흡착현상(吸着現象)은 Freundlich 정온흡착방정식(定溫吸着方程式)에 잘 부합(符合)되었다. 토양(土壤) pH를 변화(變化)시켰을 때 N-methlycarbamate계(系) 농약(農藥)의 흡착량(吸着量)에는 변화(變化)가 없었으며 이는 토양표면(土壤表面)에 hydrophobic한 부분(部分)에 물리적(物理的)으로 Vander waals 힘에 의(依)해서 흡착(吸着)되는 것으로 사료(思料)된다.