Organochlorine Pesticides in Agro-ecosystem in Shantou City, China

Organochlorine pesticides(OCPs)isa kind of synthetic pesticides with broad-spectrum, low toxicity and long residual phase. In this paper, we selected Shantou City as the study area and explored the status and characteristics of residual OCPs in soil. Meanwhile, we also made an assessment about the environmental quality and the preliminary ecological risk of the soil in this city. The results were shown as follows:(1) The detection rate of OCPs was as high as 99.13%, and the average concentration of OCPs was 113.37 ng·g -1. The main OCPs contam-inants in soil were DDTs and endosulfan. The levels of average concentrations of OCPs in different places in Shantou were: Nan’ao County(174.68 ng·g -1 ) >Dragon Lake area>Haojiang area（69.24 ng·g-1 ).（2) In addition, the average concentration of OCPs in soil in this study area was at the middle level compared with that in domestic and overseas. Compared with some related standards such as Maryland’s, the permissible concentration in soil in New York State and the domestic soil environmental quality, the level of the average concentration of OCPs in Shantou was within the limit of the standards.(3) The soil in Shantou City had a high ecological risk. The OCPs in the soil could be harmful to environment. Thereinto, DDTs showed the highest ecological risk and BHCs showed the lowest