南京某地农业土壤中有机污染分布状况研究

对某大型矿业企业周边农业土壤中两类POPs物质——15种多环芳烃和有机氯农药（DDTs和HCHs）的残留量进行了调查。结果表明，PAHs检出率为100%，总残留量范围为312.2~27 580.9 μg·kg-1，且以四环以上多环芳烃组分为主。不同样区土壤PAHs残留量受常年风向影响明显。农业土壤中有机氯农药六六六和滴滴涕均有检出，但残留水平不高，分别为3.60 μg·kg-1(0.81~9.43 μg·kg-1)和11.13 μg·kg-1(3.31~43.81 μg·kg-1)。土壤有机氯农药的残留以p,p′ DDE和p,p′ DDT为主。土壤中HCHs的各异构体组分含量特征为α>β>γ>δ。部分采样点土壤仍可能有新的有机氯污染物来源。

DISTRIBUTION OF ORGANIC POLLUTANTS IN AGRICULTURAL SOIL IN NANJING CITY

Polycyclic aromatic hydrocarbons(PAHs) and organic chlorine pesticides in soils around a steel mill were investigated. Results show that PAHs residue in this area ranged between 312.2 and 27 580.9 μg·kg-1. The PAHs with more than 4 rings were the main pollutants, especially pyrene, chrysene, fluoranthene, benzo (a) pyrene, anthracene, phenanthrene, benzo (a) anthracene, benzo (k) fluoranthene, indeno (1,2,3-cd) pyrene, benzo (g,h,i) perylene, of which the contents were closely related with the direction of the prevailing winds of the year. The HCHs and DDTs in the agricultural soil are inspected,but not being very high, 3.60 μg·kg-1 (0.81-9.43 μg·kg-1)and 11.13 μg·kg-1(3.31-43.81 μg·kg-1) respectively. The main residues are p,p'-DDE and p,p'-DDT. The characteristic of four isomers of HCHs is α>β>γ>δ. Some sample soils remain the sources of new organic chlorine pollutants.