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首页> 外文期刊>Journal of mass spectrometry: JMS >A semi-quantitative approach for the rapid screening and mass profiling of naphthenic acids directly in contaminated aqueous samples
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A semi-quantitative approach for the rapid screening and mass profiling of naphthenic acids directly in contaminated aqueous samples

机译：直接在受污染的水样中快速筛选和定量分析环烷酸的半定量方法

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摘要

We report the use of a direct sampling, online analytical approach for the determination of acid extractable naphthenic acids in complex aqueous samples, known as condensed phase membrane introduction mass spectrometry (CP-MIMS). The technique employs a capillary hollow fibre semi-permeable membrane probe configured for immersion into a pH adjusted sample. A continuously flowing methanol acceptor phase transfers naphthenic acids to an electrospray ionization source, operated in negative ion mode, whereupon they are analysed by mass spectrometry as [M-H](-) ions. High-resolution mass spectrometry is used to characterize the influence of sample pH on membrane transport of multiple components of complex naphthenic acid mixtures. We demonstrate the use of CP-MIMS for semi-quantitative analysis of real-world samples using selected ion monitoring and full scan mass spectra at unit mass resolution. The technique has also been employed to continuously monitor the temporal evolution in the mass profile and concentrations of individual naphthenic acid isomer classes in heterogeneous solutions during adsorption processes. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：我们报告了使用直接采样在线分析方法来测定复杂水性样品中酸可萃取的环烷酸的方法，即浓缩相膜引入质谱法（CP-MIMS）。该技术采用毛细管中空纤维半透膜探针，该探针配置为浸入pH调节的样品中。连续流动的甲醇受体相将环烷酸转移至以负离子模式运行的电喷雾电离源，随后将其通过质谱分析为[M-H]（-）离子。高分辨率质谱用于表征样品pH值对复杂环烷酸混合物中多种成分的膜传输的影响。我们演示了使用CP-MIMS在选定的离子监测和单位质量分辨率下的全扫描质谱分析中对实际样品进行半定量分析的方法。该技术也已被用来连续监测吸附过程中非均相溶液中各个环烷酸异构体类别的质量分布和浓度的时间变化。版权所有（c）2015 John Wiley＆Sons，Ltd.

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