废弃农药厂拆除过程对周边土壤DDTs污染影响

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Abstract

The concentrations, distributions and compositions of DDTs in surrounding soils collected four times from a closed pesticides manufacturing plant were studied, respectively, before and after the demolition of the plant. The results showed that the concentrations of DDTs (average 334ng/g) in soils collected one month after the plant demolished were higher than those obtained (average 97.0ng/g) two months before the demolition. After that, a significant decrease was seen for the concentration of DDTs in surrounding soils. Before demolistion, p,p'-DDE (average 35.6ng/g) and p,p'-DDD (average 31.0ng/g) were the main congeners in surrounding soils, whilist p,p'-DDT(average 289ng/g) was the predominant congener in the soils after demolition, which was about 28.9tims of that detected in surrounding soils before the plant demolition. The historical production of technical DDT and usage of dicofol in surrounding agricultural soils were the main reasons for the concentrations of DDTs in surrounding soils, while the volatilization of technical DDTs was the main contribution for the concentration of DDTs in surrounding soils during the plant demolishing. The spatial distribution of DDT concentrations in surrounding soil is usually dominated by the wind, and the east wind is the prevailing wind direction in this area, which resulted in higher concentrations of DDTs in the western area than those in the eastern area both before and after the plant demolished.

Key words： a closed pesticide plant demolition DDTs concentration distribution characteristics

Received: 06 July 2017

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	Articles by authors
	LI Kai-huan
	NIE Zhi-qiang
	DIE Qing-qi
	FANG Yan-yan
	ZHU Xue-mei
	WANG Jian-yuan
	YANG Yan-mei
	HUANG Qi-fei

Cite this article:

LI Kai-huan,NIE Zhi-qiang,DIE Qing-qi等. The effect of a pesticide plant demolition on the concentration of DDTs in its surrounding soils[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 658-664.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I2/658

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