Polychlorinated dibenzo- p-dioxins and dibenzofurans in soils and sediments from Daliao River Basin, China

• Published in: Chemosphere (Oxford) 2008-11, Vol.73 (10), p.1640-1648
• Main Authors: Zhang, Haijun, Ni, Yuwen, Chen, Jiping, Su, Fan, Lu, Xianbo, Zhao, Liang, Zhang, Qing, Zhang, Xueping
• Format: Article
• Language: English
• Subjects: Applied sciences; Benzofurans - analysis; Benzofurans - chemistry; China; Cluster Analysis; Daliao River; Dibenzofurans, Polychlorinated; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; Freshwater; Geologic Sediments - chemistry; Metal smelting; Organochlorine chemicals; PCDD/F; Pollution; Pollution sources. Measurement results; Pollution, environment geology; Polychlorinated Dibenzodioxins - analogs & derivatives; Polychlorinated Dibenzodioxins - analysis; Polychlorinated Dibenzodioxins - chemistry; Possible sources; Principal Component Analysis; Rivers - chemistry; Soil - analysis; Soil and sediments pollution; Soil Pollutants - analysis; Soil Pollutants - chemistry
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2008.07.067

Polychlorinated dibenzo- p-dioxins and polychlorinated dibenzofurans (PCDD/F) were analyzed in surface sediments and top soils collected from 30 sites in Daliao River Basin. The concentrations of PCDD/F ranged from 0.28 to 29.01 ng TEQ kg −1 dw (mean value, 7.45 ng TEQ kg −1 dw) in sediments, and from 0.31 to 53.05 ng TEQ kg −1 dw (mean value, 7.00 ng TEQ kg −1 dw) in soils. PCDD/F pollution in sediments from the mid- and downstream sections of Hun River was found to be relatively heavy, and the levels of PCDD/F contamination in paddy soils were generally higher than those of upland soils. Using multivariate statistical analysis, the PCDD/F homologue and congener profiles of all soil and sediment samples were compared with those of suspected PCDD/F sources. The results showed that, PCDD/F contamination in most sediments of Hun River should mainly originated from the production of organochlorine chemicals, while metal smelting was the important potential source of PCDD/F in the drainage area of Taizi River. PCDD/F contamination in paddy soils should be simultaneously attributed to the polluted water irrigation and the organochlorine pesticide application.