Agricultural soils around springwaters heavily affected by pesticide run-off and around wells considering the regional characteristics were collected at 24 stations in Jeju Island, and the physicochemical properties and adsorption and leaching characteristics of four nonionic pesticides (diazinon, fenitrothion, alachlor, and metalaxyl) were investigated. The values of the major soil factors affecting the adsorption and leaching of pesticides, namely, soil pH(H2O), organic matter content, and cation exchange capacity (CEC), were in the range of 4.64 ∼ 8.30, 0.9 ∼ 13.1% and 12.7 ∼ 31.7 meq/100 g, respectively. The Freundlich constant, KF value, which gives a measure of the adsorption capacity, decreased in the order of fenitrothion > diazinon > alachlor > metalaxyl, which was identical to their lower water solubility. Among the collected soils, the KF value was very highly correlated with organic matter content (r2 = 0.800 ∼ 0.876) and CEC (r2 = 0.715 ∼ 0.825) and showed a high correlation with clay content (r2 = 0.473 ∼ 0.575) and soil pH(H2O) (r2 = 0.401 ∼ 0.452). The leaching of pesticides in the soil column showed a reverse relationhip with their adsorption in soils, i.e., the pesticides leached more quickly for the soils with lower values of organic matter content and CEC among the soils and for the pesticides with higher water solubility.

Abstract
1. 서 론
 2. 재료 및 방법
  2.1. 토양시료 및 농약
  2.2. 실험 방법
 3. 결과 및 고찰
  3.1. 토양 시료의 물리화학적 특성
  3.2. 토양 중 비이온계 농약의 흡착 특성
  3.3. 토양 중 비이온계 농약의 용탈특성
 4. 결 론
 REFERENCES

• 전시범(제주대학교 생명과학기술혁신센터) | Si-Bum Chun (Jeju National University Biotechnology Regional Innovation Center)
• 현익현(제주특별자치도 보건환경연구원) | Ik-Hyun Hyun (Research Institute of Health & Environment, Jeju Special-Governing Province)
• 이민규(부경대학교 화학공학과) | Min-Gyu Lee (Department of Chemical Engineering, Pukyong National University)
• 감상규(제주대학교 환경공학과) | Sang-Kyu Kam (Department of Environmental Engineering, Jeju National University) Corresponding author