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| Labile Fractions and Potential Pollution Risk of Cu and Zn in Sediments in Coastal Waters of East China Sea |
| Received:October 24, 2014 |
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| KeyWord:copper;zinc;fraction;environment factors;sediments;East China Sea |
| Author Name | Affiliation | | XU Ya-yan | East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Shanghai 200090, China | | BAI Yu-cai | Shanghai Ship & Shipping Research Institute, Department of Environmental Engineering, Shanghai 200135, China | | YIN Yan-e | East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Shanghai 200090, China | | PING Xian-yin | East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Shanghai 200090, China | | WANG Yun-long | East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation and Utilization, Ministry of Agriculture, Shanghai 200090, China |
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| Abstract: |
| Sequential extractions were used to study the geochemical characteristics, influencing factors and potential pollution risks of Cu and Zn in sediments collected from the coastal waters of East China Sea in August 2011. Copper and Zn were mainly associated with fine particles of sediments in the southern area, and were significantly negatively correlated with particle sizes but positively with clay and silt contents, indicating that the natural source was a main factor controlling the contents and distributions of Cu and Zn. Higher labile fractions of Cu and Zn were observed at the Changjiang River estuary and Hangzhou Bay. The labile Cu was dominated by Cu fraction bound to carbonates, while the labile Zn was the fractions bound to carbonates and Fe/Mn-oxides. The natural sedimentary conditions had significant impacts on the labile and total contents of Cu and Zn, whereas hydrochemical conditions showed little influence on the labile fractions of Cu and Zn. The enrichment factor(EF) was Zn>Cu, with higher EF appeared in the southern area. The EF of Cu was less than 1, suggesting its terrestrial sources with little exterior inputs, while that of Zn was close to 1, indicating slight Zn pollution in the studied area. Based on their fractions, Zn and Cu were generally at slight pollution levels. However, the pollution degree was different among locations. Copper and Zn were more polluted in the Changjiang River estuary and Hangzhou Bay than in other sites, with heavy Zn pollution at C5(P=369.14%). In summary, Cu and Zn had higher total contents but lower labile fractions in the southern area, suggesting their high background values, whereas in the Changjiang River estuary and Hangzhou Bay Cu and Zn were greatly impacted by anthropogenic activities, thus having high potential pollution risks. |
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