• Sorption and Desorption Characteristics of Atrazine in Soils
  • Lee, Youn-Goog;Lee, Ju-Ry;Chung, Seon-Yong;Park, Jeong-Hun;
  • Gwangju Metropolitan Institute of Health and Environment;Dept. of Environmental Engineering, Chonnam National University;Dept. of Environmental Engineering, Chonnam National University;Dept. of Environmental Engineering, Chonnam National University;
  • 토양에 따른 atrazine의 흡.탈착 특성
  • 이윤국;이주리;정선용;박정훈;
  • 광주광역시보건환경연구원;전남대학교 환경공학과;전남대학교 환경공학과;전남대학교 환경공학과;
Abstract
Sorption and desorption processes play an important role in the transport and fate of organic contaminants in subsurface system. In this study, sorption and desorption characteristics of atrazine in 7 soils selected at the Gwangju area were investigated. Soil organic carbon contents ranged from 0.42 to 2.82%. Sorption and desorption experiments were performed in batch slurries. Sorption distribution coefficient ($K_d$) of atrazine were ranged from 0.48 to 3.26 l/kg and $K_d$ value increased with increasing organic carbon contents except of Kyongbang and Youngdong soils. Single desorption data were analyzed by the three-site desorption model including equilibrium, non-equilibrium and non-desorbable site. Non-desorbable site fractions of atrazine in all soils were enumerated and non-desorbable atrazine was observed in seriesdilution desorption experiment. Sorption/desorption hysteresis was also observed in the series-dilution desorption experiment.

오염물질이 토양에 흡착 또는 탈착하는 성질은 지하계에서 오염물질의 이동과 거동에 큰영향을 미친다. 아트라진을 대상으로 광주지역 7가지 토양을 이용하여 흡착 및 탈착특성을 조사하였다. 토양의 유기탄소함량 (organic carbon content)은 $0.42{\sim}2.82%$의 범위였으며, 아트라진의 토양분배계수 ($K_d$)는 $0.48{\sim}3.26\;l/kg$의 범위였다. 경방 토양과 용동토양을 제외한 나머지 토양들은 유기탄소함량이 증가함에 따라 $K_d$ 값은 증가하였다. Three site desortpion model을 이용하여 평형 탈착분율, 비평형 탈착분율, 비탈착 분율 그리고 탈착속도계수를 구하였다. 실험한 모든 토양에서 아트라진의 비탈착 분율이 산출되었고, 다단탈착 실험에서도 탈착되지 않는 아트라진이 토양에 존재하였다. 다단 탈착 실험에서 흡착 등온선과 탈착 등온선이 일치하지 않는 이력현상이 나타났다.

Keywords: Atrazine;Sorption;Desorption;Organic carbon content;

Keywords: 아트라진;흡착;탈착;유기탄소함량;

This Article

  • 2008; 13(2): 21-29

    Published on Apr 30, 2008

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