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Contamination characteristics of perfluorinated compounds in soil from Pearl River Delta, South China |
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Abstract Perfluorinated compounds (PFCs) have received much attention on their distributions in various matrixes including water bodies, biota, and serum of populations in recent years, however, data regarding concentrations of PFCs in soils were sparse in the scientific literature in China. In this study, forty five soil samples were collected from Guangzhou City, Dongguan City, Shenzheng City, and Zhuhai City, South China. Two target PFCs including perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in soils samples were determined by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) system. The findings suggested that concentrations of PFOS and PFOA were average value of 0.49ng/g dry weight with range of 0.05~2.41ng/g dry weight, and 0.15ng/g dry weight with range of 0.02~1.24ng/g dry weight in soils from four cities, respectively. The concentrations in soils from Dongguan City and Shenzhen City were higher than those of Zhuhai City and Guangzhou City. The compositional pattern indicated that PFOS was the dominant PFCs contaminants in soils samples, with an average relative abundance accounted for 75% of the total PFCs concentration. Significant correlations were observed between PFOS and PFOA (P<0.05), which suggesting probably similar origins of PFOS and PFOA. The findings indicated that the main pathways of PFCs into the environment were effluents of wastewater and atmospheric transmit. Compared with regions around the world, the concentration of PFOS and PFOA in soils from Guangzhou City, Dongguan City, Shenzhen City, and Zhuhai City was relatively low.
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Received: 30 June 2013
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