| 珠江河口水域有机磷农药水生生态系统风险评价 |
| 摘要点击 2696 全文点击 1205 投稿时间：2013-07-13 修订日期：2013-09-05 |
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| 中文关键词 有机磷农药 珠江河口水域 水生生态风险评价 风险商法 概率风险评价法 |
| 英文关键词 organophosphorus pesticides Pearl River Estuary aquatic ecological risk assessment risk quotient method probabilistic risk assessment method |
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| 中文摘要 |
| 通过风险商法和概率风险法评价了珠江河口水域中甲拌磷、敌敌畏及乙拌磷等9种有机磷农药对硅藻、水蚤及糠虾等8种水生生物的生态风险. 风险商法评价结果表明，9种有机磷农药混合物总风险商为：糠虾处于高风险中水平，水蚤和摇蚊在中等风险水平，硅藻、牡蛎、鲤鱼、鲶鱼和鳗鱼均处于低风险水平；甲拌磷对风险值的贡献最大，且对每种生物都有影响. 概率风险法结果表明，以HC5为参考值评估总风险商时，95%置信水平下的HC5比50%置信水平的HC5保守，50%置信水平的HC5中乐果的HC5最大，毒死蜱的最小；丰水期9种有机磷农药混合物总风险比枯水期农药混合物总风险大，甲拌磷对总风险贡献最大. 单一污染物的概率风险表明，甲拌磷和乙拌磷对珠江河口水域中10%以上的生物都有危害；而9种有机磷农药混合物的概率风险表现为：丰水期大于枯水期，均大于5%，说明超过了保护95%生物的安全阈值. |
| 英文摘要 |
| The risk quotient method and a probabilistic risk assessment method were applied for assessing aquatic ecological risk of nine organophosphorus pesticides, including thimet, dichlorovos, disulfoton, dimethoate, dimethyl parathion, chlorpyrifos, ethoprophos, sumithion and malathion on eight aquatic organisms in the Pearl River Estuary. Results using the risk quotient method revealed that the risk level of opossum shrimp was the highest among eight aquatic organisms of the Pearl River Estuary. The risk of water flea and midge was in medium level, followed by the rest six aquatic organisms, including diatom, oyster, carp, catfish and eel, which were in the low risk by the examined organophosphorus pesticides. It was found that thimet made the largest contribution to total aquatic ecological risk among nine organophosphorus pesticides to every organism. The results from probabilistic risk assessment showed that the total ecological risk in high water period was higher than that in low water period determined by the HC5 under the 95% confidence level. The largest contribution of thimet to total aquatic ecological risk subject to the HC5 in 50% confidence level was regarded as the toxic reference value. The probabilistic risk of a single contaminant showed that thimet and disulfoton were harmful to exceeded 10% organisms in the estuarine. The probabilistic risk of nine pesticides mixture in high water period was also higher than that in low water period, and both risks were greater than 5% which exceeded safety threshold for 95% organisms in the Pearl River Estuary. |
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