Occurrence and Toxicity of Three Classes of Insecticides in Water and Sediment in Two Southern California Coastal Watersheds
Occurrence and Toxicity of Three Classes of Insecticides in Water and Sediment in Two Southern California Coastal Watersheds
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DOI：
10.1021/jf202049s
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发表时间：
2011-09-14
影响因子：
6.1
通讯作者：
Gan, Jay
中科院分区：
文献类型：
--
作者：
Delgado-Moreno, Laura;Lin, Kunde;Gan, Jay
在加利福尼亚州南部海岸的两个流域调查了毒死蜱、二氮磷、拟除虫菊酯和氟虫腈的存在情况。成对的地表水和沉积物样本是在干燥和潮湿(在重大降雨事件之后)的天气条件下采集的。降雨后水和沉积物中的杀虫剂浓度高于旱季。毒死蜱是最常见的检测化合物(>；88%)。74%的水样和100%的沉积物样品中检出拟除虫菊酯，其中以-联苯菊酯的检出率最高。检测到的反式氯氰菊酯浓度最高，其次是联苯菊酯。联苯菊酯和反式氯氰菊酯的水浓度与悬浮固体水平显著相关(P<；0.01)，表明悬浮颗粒促进了迁移。在80%的湿季样本中，毒死蜱的浓度为100 ng L-1。沉积物中的拟除虫菊酯含量(0.5-1100 ng g(-1))经常高于相应的蓝藻LC_(50)值，其中联苯菊酯是毒力的主要贡献者。
The occurrence of chlorpyrifos, diazinon, pyrethroids, and fipronil was investigated in two watersheds along the southern California coast. Paired surface water and sediment samples were collected under dry and wet (after significant rain events) weather conditions. Insecticide concentrations in water and sediment were higher following rain events than during the dry season. Chlorpyrifos was the most frequently detected compound (>88%). Pyrethroids were detected in 74 and 100% of the water and sediment samples, respectively, with-bifenthrin detected most frequently.. Trans-permethrin was detected at the highest concentration followed by bifenthrin. Bifenthrin and trans-permethrin water concentrations were significantly correlated (P < 0.01) with the suspended solid level, suggesting transport facilitated by suspended particles. In 80% Of the wet season samples with 100% of Ceriodaphnia dubia mortality, chlorpyrifos concentrations were >100 ng L-1. Sediment pyrethroid levels (0.5-1100 ng g(-1)) were frequently higher than the respective-Hyalella azteca LC50 values, with bifenthrin as the primary contributor of H. azteca toxicity.