Uanited States Naval Research Laboratory, Chemistry Division, Washington, DC 20375-5342, USA.
J Chromatogr A. 2010 Jun 25;1217(26):4487-93. doi: 10.1016/j.chroma.2010.04.010. Epub 2010 Apr 24.
Practical considerations for the injection and separation of nitroaromatic explosives in seawater sample matrices are discussed. The use of high surfactant concentrations and long electrokinetic injections allows for improved detection limits. Sensitivity was enhanced by two mechanisms, improved stacking at the detector-side of the sample plug and desorption of analyte from the capillary wall by surfactant-containing BGE from the inlet side of the sample plug. Calculated limits of detection (S/N=3) for analytes prepared in pure seawater were 70-800 ppb with injection times varying from 5 to 100 s.
讨论了在海水样品基质中注入和分离硝基芳香族爆炸物的实际考虑因素。使用高表面活性剂浓度和长电动注入可提高检测限。通过两种机制提高了灵敏度，即在样品塞检测器侧改进浓缩和由样品塞入口侧含表面活性剂的 BGE 从毛细管壁上解吸分析物。在纯海水中制备的分析物的计算检出限（S/N=3）为 70-800 ppb，注入时间从 5 到 100 s 不等。
