US Geological Survey, Sacramento, California 95819, USA.
J Agric Food Chem. 2009 Oct 14;57(19):9079-85. doi: 10.1021/jf9020448.
The distribution of pyrethroid insecticides in the environment was assessed by separately measuring concentrations in the dissolved and suspended sediment phases of surface water samples. Filtered water was extracted by HLB solid-phase extraction cartridges, while the sediment on the filter was sonicated and cleaned up using carbon and aluminum cartridges. Detection limits for the 13 pyrethroids analyzed by gas chromatography-tandem mass spectrometry were 0.5 to 1 ng L(-1) for water and 2 to 6 ng g(-1) for the suspended sediments. Seven pyrethroids were detected in six water samples collected from either urban or agricultural creeks, with bifenthrin detected the most frequently and at the highest concentrations. In spiked water samples and field samples, the majority of the pyrethroids were associated with the suspended sediments.
通过分别测量地表水样品中溶解相和悬浮泥沙相中的浓度，评估了拟除虫菊酯类杀虫剂在环境中的分布情况。用 HLB 固相萃取小柱萃取过滤水，而滤器上的沉积物则用碳和铝小柱进行超声处理和净化。通过气相色谱-串联质谱法分析的 13 种拟除虫菊酯的检测限为 0.5 至 1ng/L（水）和 2 至 6ng/g（悬浮泥沙）。从城市或农业小溪中采集的 6 个水样中检测到 7 种拟除虫菊酯，其中联苯菊酯的检出率最高，浓度也最高。在加标水样和现场样品中，大多数拟除虫菊酯与悬浮泥沙有关。
