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A comparative study of metal pollution and potential eco-risk in the sediment of Chaohu Lake (China) based on total concentration and chemical speciation

Environmental Science and Pollution Research volume 21, pages 7285–7295 (2014)Cite this article

Abstract

Total and extractable concentrations of Cu, Pb, and Zn were determined in surface sediments of west Chaohu Lake (China) by HCl-HNO3-HF-HClO4 digestion and an optimized BCR sequential extraction procedure, respectively. The metal pollution was evaluated by the enrichment factor approach, and the potential eco-risk was evaluated by the sediment quality guideline (SQG) and risk assessment code (RAC) assessments. The results indicated that both total and extractable metal concentrations were highly variable and were affected by sediment properties, even though the sediments were predominantly composed of <63-μm particles (>89 %). Enrichment factors of the metals based on the total and extractable concentrations all showed higher values in the northern lake area and decreasing values towards the south. This distribution indicated an input of anthropogenic metals via the Nanfei River. Anthropogenic Cu, Pb, and Zn in surface sediments showed comparable values for each metal based on the total and extractable concentrations, suggesting that anthropogenic Cu, Pb, and Zn resided predominantly in the extractable fractions. Sediment Cu had low eco-risk, and Pb and Zn had medium eco-risk by the SQG assessment, whereas the eco-risk rankings of Cu, Pb, and Zn were medium, low, and low–high, respectively, by the RAC assessment. Referencing to the labile (dilute acid soluble) metal concentrations, we deduced that the eco-risk of Cu may be largely overestimated by the RAC assessment, and the eco-risk of Pb may be largely overestimated by the SQG assessment. Overall, sediments Cu and Pb may pose low eco-risk, and Zn may pose low–high eco-risk.

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Abbreviations

EF:

Enrichment factor

SQG:

Sediment quality guideline

RAC:

Risk assessment code

BCR:

Community Bureau of Reference

LOI:

Loss on ignition

TELs:

Threshold effect levels

PELs:

Probable effect levels

SEM:

Simultaneously extracted metals

AVS:

Acid volatile sulfides

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Acknowledgments

The authors would like to thank Yuxin Zhu and Chenchang Du for their assistance during the laboratory chemical analysis and Gavin Birch for his helpful comments at various stages while writing the manuscript and clarity of the manuscript. This work was financially supported by the National Natural Science Foundation of China (41071320) and the “333” Talents Project of the Jiangsu Province (BRA2011228).

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  1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73, East Beijing Road, Nanjing, China

    Enfeng Liu & Ji Shen

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  1. Enfeng Liu
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  2. Ji Shen
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Correspondence to Enfeng Liu.

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Responsible editor: Stuart Simpson

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Liu, E., Shen, J. A comparative study of metal pollution and potential eco-risk in the sediment of Chaohu Lake (China) based on total concentration and chemical speciation. Environ Sci Pollut Res 21, 7285–7295 (2014). https://doi.org/10.1007/s11356-014-2639-8

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  • DOI: https://doi.org/10.1007/s11356-014-2639-8

Keywords

  • Metal
  • Total concentration
  • Chemical speciation
  • Pollution
  • Eco-risk
  • Sediment