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| Effects of soil physico-chemical properties on chronic toxicity of cadmium to earthworm Eisenia fetida |
| Received:September 08, 2015 |
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| KeyWord:cadmium;soils;Eisenia fetida;chronic toxicity |
| Author Name | Affiliation | E-mail | | LIU Hai-long | School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yjwang@issas.ac.cn | | XUAN Liang | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | SONG Yin-ling | School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China | |
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| Abstract: |
| The effects of soil physico-chemical properties on the chronic toxicity of cadmium(Cd) to earthworm were investigated in 18 soils spiked with Cd by employing the methods of Organization for Economic Co-operation and Development(OECD). Results showed that Cd toxicity to E. fetida differed in different soils. No observed effect concentrations(NOEC) of Cd varied from 10 to 100 mg·kg-1. The Cd concentration for 50% of maximal inhibition effect(EC50) of cocoon production ranged from 66.5 to 263.5 mg·kg-1. Significant positive correlations were observed between soil pH, organic matter content and cadmium EC50, while significant negative correlation was present between clay content and cadmium EC50. These three factors accounted for 89.1% of variance for cadmium EC50. The bioavailability of Cd was lower in soil with higher pH and more soil organic matter, which was in accordance with the results of the inhibition of cocoon production experiments. The Cd ecotoxicity data generated in the current study may provide useful reference information for the environmental risk assessment of Cd contaminated soils and the development of soil screening values. |
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