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| Acute Toxicity of Single and Co-Exposure of Chromium(Ⅵ) and Phenanthrene to Eisenia Foetida |
| Received:June 02, 2015 |
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| KeyWord:chromium;phenanthrene;co-exposure;earthworms;acute toxicity |
| Author Name | Affiliation | E-mail | | CUI Chun-yan | College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China | | | SHEN Gen-xiang | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | shengx@saes.sh.cn | | HU Shuang-qing | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | GU Hai-rong | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | ZHANG Hong-chang | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | CAI Xiang | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | |
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| Abstract: |
| In recent years,there has been serious combined pollution of heavy metals and PAHs in soils,causing widespread concerns. The acute toxicity effects of single and co-exposure of chromium(Ⅵ) and phenanthrene on Eisenia foetida were examined with artificial soil test using standard OECD 207. The single exposure test showed that 7 d-LC50 and 14 d-LC50 values of chromium(Ⅵ) to Eisenia foetida were 259.98 mg·kg-1 and 241.13 mg·kg-1, respectively, and those of phenanthrene were 88.01 mg·kg-1 and 60.96 mg·kg-1, correspondingly. The earthworm mortality was obviously related with time and concentrations of the chemical exposure. Phenanthrene had greater toxicity to Eisenia foetida than chromium(Ⅵ) did. The joint acute toxicity of chromium(Ⅵ) and phenanthrene examined under toxic equivalent ratio indicated that the 7 d-LC50 values in the mixture were 151.73 mg·kg-1 and 37.93 mg·kg-1, and the 14 d-LC50 137.69 mg·kg-1 and 34.42 mg·kg-1, for chromium(Ⅵ) and phenanthrene, respectively. The joint effect of chromium(Ⅵ) and phenanthrene on Eisenia foetida was additional joint action based on the isobologram of exposure concentrations and time of chromium(Ⅵ) and phenanthrene. |
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