| In this study, the organochlorine pesticides (OCPs) residue in soil samples collected in Xigu District of Lanzhou were analyzed by using GC/μECD method. The contamination levels, spatial distribution, isomeric composition, probable sources and potential ecological risks of OCPs in soil samples were systematically investigated. The results showed that 8 kinds of OCPs were detected in all soil samples, and the total concentrations of OCPs (∑OCPs) ranged from 18.34 μg/kg to 125.34 μg/kg while the average was 54.84 μg/kg. The concentration of BCHs and DDTs were in the range of 0.742 μg/kg to 29.3 μg/kg and 10.9 μg/kg to 98.6 μg/kg, respectively. β-BCH and p,p′-DDT were the dominating compounds. Among the different sampling areas, the concentration of OCPs arranged from high to low was from roadside, greenbelt, tree root and vegetable field. The BCHs residue was derived from previous use, and DDTs was from recent pollution, according to component analysis of DDTs and BCHs isomer residue. |
