【摘要】 2001年5月采集并测定了天津地区188个土壤表层样品的-HCH, -HCH, -HCH和-HCH等有机氯农药的残留量.与1981年的残留量相比较,各区县土壤中親CH有较大幅度减少,但4种HCH异构体的残留仍然较高.其中-HCH是最主要的残留污染物,最高浓度超过1000ng/g.1970~ 1980年HCH施用量较高的地区如今土壤中的残留量仍然较高,城区样品中HCH的残留浓度高于非城区,而污灌区与非污灌区土壤中的残留水平差异不显著.土壤TOC含量与親CH有较为显著的相关关系.更多还原

【Abstract】 The residue amounts of organic chlorpesticides (-HCH, ?HCH, ?HCH, -HCH) of 188 surface soil samples of Tianjin area were determined in May, 2001. Compared with the residue amount of the year 1981, the 親CH in soils of each district and county decreased with higher range; but the residues of 4 HCH isomers were still higher, of which -HCH is the most, with highest concentration over 1000 ng/g. Of the area with greater usage of HCH in the years 1970~1980, the residue amount in soil was still rather high at present. The residue concentration of HCH in the urban area is higher than that in the rural area; while there was no significant difference of the residue level between the soils with and without wastewater irrigation. The content of TOC in soil was correlated with 親CH rather markedly.更多还原