Source and Migration of Short-Chain Chlorinated Paraffins in the Coastal East China Sea Using Multiproxies of Marine Organic Geochemistry

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• 作者：Zongshan Zhao ; Huijuan Li ; Yawei Wang ; Guoliang Li ; Yali Cao ; Lixi Zeng ; Jing Lan ; Thanh Wang ; Guibin Jiang
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：May 21, 2013
• 年：2013
• 卷：47
• 期：10
• 页码：5013-5022
• 全文大小：570K
• 年卷期：v.47,no.10(May 21, 2013)
• ISSN：1520-5851

文摘

Multiple proxies of terrestrial organic matters (TOM) were introduced to study the migration behaviors of short-chain chlorinated paraffins (SCCPs) in the coastal East China Sea (ECS). The contents of SCCPs in the surface sediment collected from Changjiang (Yangtze) River Delta (CRD) and along the Zhejiang鈥揊ujian coastline ranged from 9.0 to 37.2 ng/g (dry weight, d.w.), displaying a 鈥渂and-style鈥?distribution trend. Spatial distribution patterns of SCCP congeners presented an increasing trend seaward and southward along the coastline for shorter carbon length (C₁₀ + C₁₁) and lower chlorinated (Cl₅ + Cl₆ + Cl₇) congeners, suggesting a spreading tendency seaward and southward from the CRD and the north of the inner shelf. The significant relationship between 危SCCPs and total organic carbons (TOC) (r² = 0.402, p < 0.05) indicated that the migration of SCCPs in sediments was markedly affected by TOC. The spatial patterns of the TOM proxies of TOC 未¹³C, the contents of 危C₂₇ + C₂₉ + C₃₁n-alkanes, terrestrial marine biomarker ratio (TMBR), and terrestrial TOC (T-TOC) were all similar to that of 危SCCPs. Linear relationships between SCCP contents and both the contents of 危C₂₇ + C₂₉ + C₃₁n-alkanes (r² = 0.537, p < 0.05) and T-TOC (r² = 0.495, p < 0.05) were also observed. The consistence demonstrated that a major portion of sedimentary SCCPs in the coastal ECS should be from the river input of Changjiang River and deposited in the CRD and along the inner shelf of the ECS, but only a minor fraction was transported to the offshore areas.