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发布者:鑫达医学翻译公司 发布时间:2011-07-25 8:50:52 阅读:

原文:
Sediment samples collected from California were quantified using the newly developed GC–MS/MS, and a previously developed GC-ECD method after ASE extraction, and SPE cleanup. The comparison of the analytical results is presented in Table 4, and the chromatograms of sediment B analyzed by the two techniques are shown in Fig. 4. Cleaner chromatograms were obtained using GC–MS/MS, and the results matched well for the two methods in most cases. However, differences in results did exist, andmay be attributed to the matrix response enhancement effect, and/or interference by various matrix components.
Bifenthrin and permethrin were the most frequently detected pyrethroids, and were identified by GC–MS/MS in all field-collected sediments. Deltamethrin was detected at concentrations close to the RL in sample C by GC-ECD and sample D by GC–MS/MS. It has been reported that tralomethrin would undergo debromination to form deltamethrin in the GC inlet, thus the detected deltamethrin in the field samples may be tralomethrin and/or deltamethrin. Overall, the GC–MS/MS method provided a slightly better identification of the pyrethroids from the complicated matrices in comparisons to GC-ECD, especially at low concentrations. Several pyrethroids were detected using the GC–MS/MS, and were not detected using GC-ECD, and this may be attributed to the difficulty in differentiating trace pyrethroids from the matrix interference.
Using the spectrum as confirmation, GC–MS/MS provided more confidence in peak identification than GC-ECD. Another advantage of MS/MS was its ability to analyze pyrethroids without electron capture elements, such as resmethrin, which produced no signal with ECD. As shown in Table 4, trace resmethrin was identified by GC–MS/MS in sample B, though the concentration was below the reporting limit. Thus, more pyrethroids were identified and quantified using the GC–MS/MS technique.

译文:
采用以往发明的GC-ECD法与新研制的GC-MS/MS(ASE萃取与SPE净化后实施)对采自美国加州的沉积物样本进行定量分析。表4为对分析结果进行了比较。B沉积物样本的色谱图如图4。采用GC-MS/MS所得色谱图更为清晰,多数情况下两种方法所得结果匹配良好。但也存在不同,可能由基质应答增强效应和/或不同基体干扰导致。
经常检测到的拟除虫菊酯有两种-联苯菊酯与扑灭司林,利用GC-MS/MS在所有野外采集的沉积物内都可检测到。检测所得溴氰菊酯浓度与C样本检测(GC-ECD)与D样本检测(GC-MS/M)的RL相近。据报道,四溴菊酯在GC入口脱溴形成溴氰菊酯。因此,野外采集样本检测到的溴氰菊酯可能来自四溴菊酯和/或溴氰菊酯。总之,与GC-ECD相比,GC-MS/MS能从复杂的基质中更好地检测拟除虫菊酯,低浓度下效果更明显。利用GC-MS/MS可以检测出多种GC-ECD不能检测出的拟除虫菊酯,这可能与自基质干扰内区分微量拟除虫菊酯难度有关。利用质谱进行确认,发现GC-MS/MS峰值鉴定的置信度高于GC-ECD。MS/MS的另一优势为可对不产生电子捕获元素(不产生ECD信号)的拟除虫菊酯(如苄呋菊酯)进行分析。如表4所示,虽然苄呋菊酯浓度低于报道极限,但利用GC-MS/MS在B样本内可检测到存在微量苄呋菊酯。因此,使用GC-MS/MS技术可对更多拟除虫菊酯进行鉴定与定量。


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