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| Effect of Cadmium on Degradation of Malachite Green in Sediment from an Aquaculture Pond |
| Received:October 04, 2014 |
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| KeyWord:sediment;combined pollution;cadmium;malachite green;leuco malachite green;degradation |
| Author Name | Affiliation | E-mail | | LI Zhi-bo | College of Fishery, Nanjing Agricultural University, Wuxi 214081, China | | | SONG Chao | Key Laboratory of Ecological Environment and Resources of Inland Fisheries Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | | | ZHANG Cong | College of Fishery, Nanjing Agricultural University, Wuxi 214081, China | | | FAN Li-min | Key Laboratory of Ecological Environment and Resources of Inland Fisheries Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | | | CHEN Jia-zhang | College of Fishery, Nanjing Agricultural University, Wuxi 214081, China
Key Laboratory of Ecological Environment and Resources of Inland Fisheries Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China | chenjz@ffrc.cn |
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| Abstract: |
| Malachite green(MG) and its metabolites are mutagenic, carcinogenic, and teratogenic to living organisms. These organic compounds and heavy metals often coexist in the environment. Here we studied the effect of Cd on MG degradation in aquaculture pond sediment. At the same concentrations, MG degradation trend was not different between single and compound pollution, and the kinetic equations for MG degradation were also similar between them. At 2.5 mg MG·kg-1, the half-life of MG was(3.432±0.059),(3.362±0.041) and (3.456±0.088)d at 0, 0.5, and 5.0 mg·kg-1 Cd, respectively, while at 0.25 mg MG·kg-1, it was(4.140±0.042),(4.318±0.167) and (4.271±0.045)d at 0, 0.5, and 5.0 mg·kg-1 Cd, respectively. However, Cd had significant influence on the presence of leuco malachite green(LMG). At high MG concentration, LMG was in order of 0.5 mg·kg-1 Cd>5.0 mg·kg-1 Cd>0 mg·kg-1 Cd treatments during the whole experimental period, implying that low Cd may inhibit biodegradation of LMG, but relatively high concentrations of Cd could facilitate non-biodegradation of LMG. These results show that heavy metal Cd has little influence on the degradation of MG in sediment environment of aquaculture pond. |
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