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| Influence of Humic Acid on Acute Toxicity of Prometryn to Danio rerio |
| Received:November 18, 2014 |
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| KeyWord:humic acid(HA);prometryn;acute toxoticy;zebrafish(Danio rerio) |
| Author Name | Affiliation | E-mail | | ZHAO Qian | Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | | | WANG Can-can | Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | | | YUAN Xu-jiao | Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | | | ZHU Lin | Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | zhulin@nankai.edu.cn |
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| Abstract: |
| Humic acid(HA) is a principal component of dissolved organic matters in all aquatic ecosystems. It comprises of a variety of molecular structures and functional groups and can bind pollutants in the water, thereby affecting the pollutant toxicity to aquatic organisms. In this study, a triazine herbicide prometryn, commonly present in the surface and ground water, was chosen as the target pollutant and a model organism zebrafish(Danio rerio) as the target organism. The aim of this study was to investigate the acute toxicity of prometryn to Danio rerio at 5 and 15 mg·L-1 HA concentrations. Under single prometryn exposure, the 24 h, 48 h, 72 h, and 96 h median lethal concentrations(LC50) of prometryn to Danio rerio were 9.143, 8.432, 7.645, and 7.448 mg·L-1 and 95% confidence intervals were 8.635~9.861, 7.408~9.934, 7.041~8.310, and 7.032~7.971 mg·L-1, respectively. Based on these acute toxic experiment results, prometryn had the high toxicity to Danio rerio. In addition, 96 h cumulative mortality rate of Danio rerio did not change obviously with 5 mg·L-1 HA when the concentrations of prometryn were 6.5, 7.5, and 8.5 mg·L-1. In contrast, the same toxicological parameter became 40% higher at 15 mg·L-1 HA than HA-free when prometryn concentration was 8.5 mg·L-1. It was shown that HA can increase the acute toxicity under higher prometryn concentrations. This might be explained by a hypothesis that the association of prometryn with DOM reducing its toxicity might be overshadowed by other mechanisms actually enhancing its toxicity in water. |
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