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.
08×104km2的范围内以1点/36km2的采样密度采集表层土壤299件,测试六六六(HCH)、滴滴涕(DDT)等10项指标。