丁醚脲农药对3种水生生物的风险评价

Risk Assessment of Diafenthiuron to Three Species of Aquatic Organisms

研究了丁醚脲乳油和悬浮剂2种剂型对水生生物的急性毒性。结果表明,质量分数25%丁醚脲乳油对斑马鱼、河虾为高毒,对河蟹为低毒;质量分数50%丁醚脲悬浮剂对斑马鱼为高毒,对河虾为中毒,对河蟹为低毒。在室内毒性试验的基础上,应用多层次生态风险评价方法,评价丁醚脲对稻田-鱼塘模拟生态系统中水生生物的风险性。结果表明,质量分数25%丁醚脲乳油对斑马鱼、河虾具有极高的风险性,对河蟹影响较小;质量分数50%丁醚脲悬浮剂对斑马鱼也具有较高风险,对河虾、河蟹的风险性较低。鉴于丁醚脲对水生生物有较高的风险性,为保护环境有益生物,应当禁止或限制其在稻田中使用。

Acute toxicity of diafenthiuron emulsifiable concentrate（EC） and diafenthiuron suspension concentrate（SC） to aquatic organisms was studied.The results show that 25% diafenthiuron EC was classified to be high in toxicity to Brachydanio rerio and Macrobrachium nippoensis and low to Eriocheir sinensis;whereas 50% diafenthiuron SC was classified to be high in toxicity to Brachydanio rerio,moderate to Macrobrachium nippoensis and low to Eriocheir sinensis.The multi-tiered ecological risk assessment method was used to assess the risk of diafenthiuron to aquatic organisms in a simulated paddy field-fish pond ecosystem.Results show that 25% diafenthiuron EC posed an extremely high risk to Brachydanio rerio and Macrobrachium nippoensis,but a low risk to Eriocheir sinensis;whereas 50% diafenthiuron SC did a high risk to Brachydanio rerio,and a relatively low risk to Macrobrachium nippoensis and Eriocheir sinensis.In view of its high risk potential to aquatic organisms,for protection of environment and organisms the use of diafenthiuron should be banned or restricted in paddy fields.