Spatial Distributions and Deposition Chronology of Short Chain Chlorinated Paraffins in Marine Sediments across the Chinese Bohai and Yellow Seas

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• 作者：Lixi Zeng ; Ru Chen ; Zongshan Zhao ; Thanh Wang ; Yan Gao ; An Li ; Yawei Wang ; Guibin Jiang ; Liguang Sun
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：October 15, 2013
• 年：2013
• 卷：47
• 期：20
• 页码：11449-11456
• 全文大小：495K
• 年卷期：v.47,no.20(October 15, 2013)
• ISSN：1520-5851

文摘

As the most complex halogenated contaminants, short chain chlorinated paraffins (SCCPs) are scarcely reported in marine environments. In this work, a total of 117 surficial sediment (0鈥? cm) samples and two sediment cores were collected from the Chinese Bohai and Yellow Seas to systematically study the spatial and temporal trends of SCCPs at a large scale in the Chinese marine environment. Total SCCP concentrations in the surficial sediments were in the range of 14.5鈥?5.2 ng g^鈥? (dry weight, d.w.) with an average level of 38.4 ng g^鈥? d.w. Spatial distribution showed a decreasing trend with the distance from the coast to the open waters. Compositional pattern analysis suggested that C₁₀ was the most predominant homologue group, followed by C₁₁, C₁₂, and C₁₃ homologue groups. The concentrations of total SCCPs in sediment cores ranged from 11.6 to 94.7 ng g^鈥? d.w. for YS1 and from 14.7 to 195.6 ng g^鈥? d.w. for YS2, with sharp rise from the early 1950s to present based on ²¹⁰Pb dating technique. The historical records in cores correspond well to the production and usage changes of CPs in China. Multivariate regression statistics indicate TOC, latitude and longitude are the major factors influencing surficial SCCP levels in the Chinese East Seas by combining analysis with the data from the East China Sea (R² = 0.332, p < 0.01). These findings indicated that the sources of SCCPs were mainly from river outflows via ocean current and partly from atmospheric depositions by East Asian monsoon in the sampling areas.