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首页> 外文期刊>Environmental toxicology and chemistry >CAUSES OF WATER TOXICITY TO HYALELLA AZTECA IN THE NEW RIVER, CALIFORNIA, USA
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CAUSES OF WATER TOXICITY TO HYALELLA AZTECA IN THE NEW RIVER, CALIFORNIA, USA

机译：美国加利福尼亚州新河水对透明质酸的毒性原因

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The New River (CA, USA) was created in 1905 to 1907 when the Colorado River washed out diversionary works and flowed into the Salton Basin, creating the Salton Sea. Approximately 70% of the river's current flow is agricultural wastewater from the Imperial Valley. The river is contaminated with pesticides, industrial organic chemicals, metals, nutrients, bacteria, and silt. Monitoring for the State of California Surface Water Ambient Monitoring Program has indicated persistent water column toxicity to the epibenthic amphipod Hyalella azteca. Four toxicity identification evaluations (TIEs), along with chemical analyses, were performed, and the results indicated multiple and varying causes of toxicity. The first two TIEs characterized the causes of toxicity as a combination of metals and organics, but only the second sample contained enough total copper to contribute to toxicity. The third TIE used an emerging method for characterizing and identifying toxicity caused by pyrethroid pesticides. This TIE characterized organics as the cause of toxicity, and a carboxylesterase enzyme treatment further identified the cause of toxicity as pyrethroids. The final TIE used the enzyme and Phase II procedures to identify cypermethrin as the cause of toxicity. The TIE results demonstrate the evolving causes of toxicity in the New River and should assist regulators with implementing the total maximum daily load process for pesticides, particularly pyrethroids. Further research will determine if pyrethroids and other New River contaminants are having an impact on the Salton Sea.
机译：新河（美国加利福尼亚州）创建于1905年至1907年，当时科罗拉多河冲刷了改道工程并流入索尔顿盆地，形成了索尔顿海。这条河目前约有70％的流量来自帝国谷的农业废水。这条河被农药，工业有机化学品，金属，养分，细菌和淤泥污染。加州地表水环境监测计划状态的监测表明，水柱对表皮水生两足动物透明质酸菌有持续的毒性。进行了四次毒性鉴定评估（TIE），以及化学分析，结果表明多种不同的毒性原因。前两个TIE以金属和有机物的组合来表征毒性的原因，但是只有第二个样品包含足以导致毒性的总铜。第三个TIE使用了一种新兴方法来表征和鉴定拟除虫菊酯农药引起的毒性。该TIE将有机物定为毒性原因，而羧酸酯酶处理进一步确定了拟除虫菊酯的毒性原因。最终的TIE使用酶和II期程序来确定氯氰菊酯为毒性原因。 TIE的结果证明了新河中毒性的不断演变的原因，并应协助监管机构实施农药（尤其是拟除虫菊酯）的最大每日总装载过程。进一步的研究将确定拟除虫菊酯和其他新河污染物是否对索尔顿海产生影响。

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