Abstract:

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 29240 μg/kg, while the contents of ∑HCHs varied from 069 μg/kg to

2662 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.

Key words:

Key words: agricultural soil；organochlorine pesticides；distribution characteristics