살충제 DDT 검출 가금농장의 주변지역과 토양 깊이별 DDT 분포 양상

Abstract

This study investigated DDT residues in chicken farm and its surrounding farmland, where DDTs were previously detected in eggs and chickens in Gyeongsan-si, Gyeongsangbuk-do in 2017. The study focused on the absorption and translocation of DDTs into crops, as well as their vertical mobility in soil and groundwater. Extraction and purification of DDTs from plant and soil samples were carried out using of slight modified QuEChERS method. DDTs were detected in soil at the following concentration: 0.48-1.99 mg/kg at the depth of 0-10 cm, 0.08-4.89 mg/kg at 10-50 cm, 0.01-1.35 mg/kg at 50-100 cm, and 0.02 mg/kg or less in 100-140 cm within the chicken farm area. No residues were detected below a depth of 140 cm. Notably the highest concentration (4.89 mg/kg) was found at a depth of 30-40 cm. The concentration of DDTs generally decreased with increasing soil depth, and no residues were detected below 140 cm. In addition, trace amounts of DDTs (0.01-0.1 mg/kg) were intermittently detected in nearby farmland soil up to 3 km away, but no residues were detected in any crop samples. These findings confirm that pesticide DDT, which used over 40 years ago, still persists in soil but not in surrounding plants. The results suggest that further research is needed to assess exposure levels through continued monitoring of persistent organic pollutants (POPs) in agricultural environments.