Comparison of single and sequential extraction procedures of heavy metals and their pollution indications in sediments of the Jiaozhou Bay

Liang Xianmeng; Song Jinming; Duan Liqin; Yuan Huamao; Li Ning; Li Xuegang

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Liang Xianmeng, Song Jinming, Duan Liqin, Yuan Huamao, Li Ning, Li Xuegang. Comparison of single and sequential extraction procedures of heavy metals and their pollution indications in sediments of the Jiaozhou Bay[J]. Haiyang Xuebao, 2016, 38(10): 12-21.

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Comparison of single and sequential extraction procedures of heavy metals and their pollution indications in sediments of the Jiaozhou Bay

1.
The Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100039, China
2.
The Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100039, China;Marine Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

Received Date: 2016-01-26

Abstract

Abstract

The speciation of heavy metals in marine sediments plays an important role in indicating the pollution status. To explore a concise and effective method to extract the labile fractions of heavy metals (Cr, Cu, Ni, Pb, Zn) and Al, Fe, Mn, we compared the extraction efficacy of 0.1 mol/L HCl, 1 mol/L HCl and BCR procedure for the metals in surface sediments of the Jiaozhou Bay. The results showed that the contents of extracted metals by these three methods had significant positive correlations with each other. The two HCl methods both had high extraction efficiencies for acid-soluble and reducible forms, but lower extraction efficiencies for oxidizable forms. The metals extracted by the BCR procedure had the highest anthropogenic signal index(ASI), indicating that the BCR procedure had the highest extraction efficiency for labile fractions of metals among the three methods. The ASI of metals extracted by 1 mol/L HCl was the lowest, which may be due to that the non-labile fractions of heavy metals in the inner layer of large particles were leached out by the higher acidity, enhancing the pollution signal of heavy metals in sediments. The ASI of Cu, Pb and Zn extracted by 0.1 mol/L HCl was similar to that extracted by the BCR procedure. Furthermore, after the Al normalized, the spatial distribution of labile fraction of heavy metals extracted by 0.1 mol/L HCl were consistent with the actual contamination pattern, demonstrating that 0.1 mol/L HCl extraction method could replace the complex BCR procedure to a certain extent. This method simplify the extraction procedure for labile fractions of heavy metals and is suitable for the large scale evaluation of heavy metal pollution.
- heavy metals,
- labile fraction,
- extraction method,
- sediment,
- Jiaozhou Bay

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