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Toxic effects of heavy metals on the freshwater benthic organisms in sediments and research on quality guidelines in Poyang Lake, China

  • Sediments, Sec 4 • Sediment-Ecology Interactions • Research Article
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Abstract

Purpose

Sediment Quality Guidelines (SQGs) are the standard for protecting organisms from chemical hazards. Species Sensitivity Distribution (SSD), a typical derivation method of the SQGs, has been widely used for organic pollutants, whereas there are few studies applied on metals. This study investigated the toxic effects of Cu, Cd, Zn, and Pb to Limnodrilus hoffmeisteri and Chironomus larvas, obtained the SQGs by the SSD method, and evaluated the ecological risks of Poyang Lake, China.

Materials and methods

The test endpoints of L. hoffmeisteri (mortality and autotomy rates) and C. larvas (mortality and growth inhibition rates) after 21- and 14-day exposure of Cu, Cd, Zn, and Pb in the sediments of Poyang Lake were conducted, respectively. The SSD method was used for the curve optimal fitting and the SQG calculation based on the biotoxicity data of the local species in Poyang Lake. The ecological risk of Poyang Lake was assessed by calculating the potential ecological risk index (RI). The toxicity quotient Q was used for the SQGs verification of Cu, Cd, Zn, and Pb.

Results and discussion

According to the results of toxicity tests, C. larvas are more sensitive to the stress effects of heavy metals compared to L. hoffmeisteri. The Criteria Continuous Concentration (CCC) of Cu, Cd, Zn, and Pb were 34.9, 0.5, 58.2, and 35.0 mg kg−1, respectively. The Criteria Maximum Concentration (CMC) of Cu, Cd, Zn, and Pb were 56.35, 2.0, 151.3, and 175.0 mg kg−1, respectively. We selected C. larvas as experimental organisms to verify the SQGs and the results conformed to the meaning of guidelines. The RI values for heavy metals in all sampled sediments (P1 to P10) showed low potential ecological risks (RI < 120), except P2, P6, and P10. High potential ecological risks (RI > 120) of P2, P6, and P10 are mainly attributed to Cd.

Conclusions

In general, the CCC and CMC of Cu, Cd, Zn, and Pb conformed to the meaning of guidelines. The ecological risk index method showed that Poyang Lake was slightly polluted by Cu, Zn, and Pb, while heavily polluted by Cd. The results of the SQGs of heavy metals and ecological risk assessment can provide theoretical support for monitoring heavy metal pollution and biodiversity protection in Poyang Lake.

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Acknowledgments

We would like to thank professor Lingyan Zhu of Nankai University for providing experimental biology, Peng Li of University of Queensland and Liang He of Nanchang University for their guidance on article revision.

Funding

This research received funding from The Major Science and Technology Program for Water Pollution Control and Treatment, China (No.2017ZX07301002-05), the National Nature Science Foundation of China (No. 21767018), the Natural Science Foundation for Distinguished Young Scholars of Jiangxi Province (No. 20171BCB23017), and the Open Project Program of State Key Laboratory of Food Science and Technology, Nanchang University (No. SKLF-KF-201807), and the Graduate Students Innovation Special Fund of Nanchang University (No.CX2019110).

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Correspondence to Gang Ge or Yun Huang.

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Responsible editor: Klara Hilscherova

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Zhang, P., Pan, X., Wang, Q. et al. Toxic effects of heavy metals on the freshwater benthic organisms in sediments and research on quality guidelines in Poyang Lake, China. J Soils Sediments 20, 3779–3792 (2020). https://doi.org/10.1007/s11368-020-02700-5

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  • DOI: https://doi.org/10.1007/s11368-020-02700-5

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