| Literature DB >> 14664854 |
Z M Gong1, S Tao, F L Xu, R Dawson, W X Liu, Y H Cui, J Cao, X J Wang, W R Shen, W J Zhang, B P Qing, R Sun.
Abstract
One hundred and eighty eight surface soil samples were collected from the Tianjin area to study the contamination of DDT and its metabolites. Measurements were taken for p,p'-DDE, p,p'-DDD, p,p'-DDT, o,p'-DDE, o,p'-DDD and o,p'-DDT for all samples. The results indicated that p,p'-DDT and p,p'-DDE were the predominant contaminant compounds in the surface soil samples, with mean concentrations of 27.5 and 18.8 ng g(-1) respectively. No significant differences in DDT concentrations were found between the soils from wastewater treated irrigated areas and other areas, suggesting that wastewater irrigation is not an important source of DDT in the area. However, the spatial distribution of soil DDTs levels in the area did correlate well with early direct application rates of pesticides. In addition, both pH level and organic carbon content are also known factors affecting the level of DDT and its metabolites. Although it was assumed that the use of these chemicals was banned in the early 1980s, the current concentration levels appear to be too high to be mere residuals after 20 years degradation.Entities:
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Year: 2004 PMID： 14664854 DOI： 10.1016/j.chemosphere.2003.10.021
Source DB: PubMed Journal: Chemosphere ISSN： 0045-6535 Impact factor: 7.086