Beijing is the political, economical and cultural center of China with a huge
population. As the rapid development of society and economy, a great many of environmental
problems come about. The organochlorine pesticide is a kind of persistent organic
pollutants, and nowadays more attention is paid to its pollution to the environment. Because
the quality of soil is closely related to the human health, it is very important and
meaningful to do research on the residues of organochlorine pesticide in agricultural soil
in the suburb of Beijing. In this paper, the distributional characteristics of the DDTs and
HCHs residues were analyzed in both surface and deep soil samples. The risks of DDTs and
HCHs residues were also discussed, and it could provide a reference for evaluation of
environmental geochemistry. The DDTs and HCHs were detected in 9 surface soil and 8 deep
soil samples at different levels. The DDTs residues were at a low level with the ∑DDTs
ranging from 0 to 29240 μg/kg, while the contents of ∑HCHs varied from 069 μg/kg to
2662 μg/kg. Few DDT isomers were detected in the deep soil samples. The contents of DDTs
were decreased with the increase in the depth of soil profile. In one sample the four
isomers of DDT were found in the first layer, and in the others only p,p′DDE was
detected. The HCHs were found in all the layers at different levels. The contents of HCHs
were not increased obviously as the depth of soil profile increased. The concentrations of
DDTs in most samples reached the first level of the national standard quality of soil
environment (GB 1561895). And the contents of HCHs were also lower than the standard.
According to the concentration and distribution of different isomers, we concluded that
there was no new input of pollution in this area.
