Residual of organochlorine pesticides and distribution features of soils in the southwest area of Shandong Province, China. Geological Bulletin of China

In the southwest area of Shandong Province within the range of 10800 km2, in total 299 top soil samples were collected with the density of 36km2, and 10 indices were determined such as HCH and DDT. By studying the variation of these content, the authors found the soil remains relatively high in HCH and DDT which have been banned to use for over 20 years. The β-HCH has the most high content in the four isomers of HCH which mainly exist in form of P,P-DDE and P,P-DDD; Furthermore, indicated by the changing rule of α-HCH／γ-HCH, β-HCH／γ-HCH and（P,P′-DDE＋P,P′-DDD）/P,P′-DDT, the authors induced that locally there may exist new pollutant sources input only for HCH within surveyed area, For most area, HCH and DDT were stopped from using for a long time, their compositions had undergone huge change through physical and chemical action, so the pollutant was formed in the past. The result of soil environment quality evaluation indicates that the soil quality can guarantee agricultural production and people′s health.