| 水中天然有机溶解物对速灭菊酯毒性的影响 |
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| 中文关键词 天然有机溶解物 速灭菊酯 大型溞 毒性 |
| 英文关键词 natural dissolved organic matter fenvalerate Daphnia magna toxicity |
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| 中文摘要 |
| 水中天然有机溶解物(DOM)按分子大小分成4个组分.杀虫剂速灭菊酯对大型溞的毒性因加入10倍天然浓度的DOM的1μ—0.2μ组分而显著增大,速灭菊酯的EC50由0.76μg/L降低到0.29μg/L.DOM的其它组分(0.2μ—30kM.W.,30k—10kM.W.,10k—1kM.W)不影响其毒性或稍有降低但不显著.发现粘附大型溞的程度与速灭菊酯的浓度成比例,但是粘附与所用的DOM的大小组分无关. |
| 英文摘要 |
| Natural aquatic dissolved organic matter (DOM) was separated into four fractions on the basis of molecular size. The toxicity of insecticide fenvalerate to Daphnia magna was significantly increased by the addition of t^n times the natural concentration of 1μ-0.2μ size fraction of DOM and, as a result, the EC50 of the insecticide reduced from 0.76p,g/L to 0.29p.g/L. Other fractions (0.2-30k M. W., 30k-10k M. W.) of DOM did not affect or very slightly decreased the toxicity. The extent of adhesion to Daphnia was found to be proportional ro the concentration of fenvalerate, but showed no correlation to the size fraction of DOM under consideration. |
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