The effect of a pesticide plant demolition on the concentration of DDTs in its surrounding soils
LI Kai-huan1,2, NIE Zhi-qiang2, DIE Qing-qi2, FANG Yan-yan2, ZHU Xue-mei2, WANG Jian-yuan2, YANG Yan-mei1, HUANG Qi-fei2
1. School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2. Institute of Soil and Solid Waste, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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.
李开环, 聂志强, 迭庆杞, 方艳艳, 朱雪梅, 王健媛, 杨延梅, 黄启飞. 废弃农药厂拆除过程对周边土壤DDTs污染影响[J]. 中国环境科学, 2018, 38(2): 658-664.
LI Kai-huan, NIE Zhi-qiang, DIE Qing-qi, FANG Yan-yan, ZHU Xue-mei, WANG Jian-yuan, YANG Yan-mei, HUANG Qi-fei. The effect of a pesticide plant demolition on the concentration of DDTs in its surrounding soils. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 658-664.
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