Department of Chemistry, Washington State University, Pullman, WA 99164, United States; Pacific Northwest National Laboratory, Richland, WA, United States.
Pacific Northwest National Laboratory, Richland, WA, United States.
Talanta. 2019 Apr 1;195:683-690. doi: 10.1016/j.talanta.2018.11.115. Epub 2018 Dec 1.
In addition to serving as an f-element ligand and rare-earth method complexing agent, tributyl phosphate is a compound containing core functional groups that mimic those routinely found in degradation products from industrial processes. Because detection of trace quantities of tributyl phosphate can provide insight into the routes of contamination and degradation in the environment, there is a need to develop methods capable of detecting trace quantities of tributyl phosphate. Vapor detection at atmospheric pressure is one approach that is both sensitive and rapid. We present here the use of atmospheric flow tube mass spectrometry for the ambient vapor sampling of tributyl phosphate from headspace of ppb-level solutions in methanol. Gas phase clustering reactions were to enhance detection levels via the addition of small quantities of the dopants diethylamine, triethylamine, and pinacolyl methylphosphonate in the vapor stream. Detection of the tributyl phosphate vapor emanating from these solutions demonstrated a linear range for the protonated tributyl phosphate species of 1-1000 ppb from solution. The clusters of tributyl phosphate with diethylamine, triethylamine, and pinacolyl phosphonate each yielded linear ranges of 1-250 ppb for tributyl phosphate in solution. Despite smaller linear ranges, the addition of these dopant species added a layer of analytical selectivity and reduced variability in signals from quality control samples. These data were obtained using an atmospheric flow tube source coupled to a linear ion trap mass spectrometer, which demonstrates the applicability of trapping systems to the atmospheric flow tube ionization technique while monitoring positive ions.
除了作为 f 族元素配体和稀土元素络合剂外，磷酸三丁酯还是一种含有核心功能基团的化合物，这些功能基团模拟了工业过程中降解产物中常见的功能基团。由于检测到痕量的磷酸三丁酯可以提供有关环境中污染和降解途径的信息，因此需要开发能够检测痕量磷酸三丁酯的方法。在大气压下进行蒸汽检测是一种既敏感又快速的方法。我们在这里提出了使用大气流动管质谱法从甲醇中 ppb 级溶液的顶空环境中对磷酸三丁酯的环境蒸汽进行采样。气相聚类反应通过在蒸汽流中添加少量掺杂剂二乙胺、三乙胺和频哪醇甲基膦酸酯来提高检测水平。从这些溶液中散发的磷酸三丁酯蒸汽的检测显示，从溶液中检测到的质子化磷酸三丁酯物种的线性范围为 1-1000 ppb。与二乙胺、三乙胺和频哪醇膦酸酯形成的磷酸三丁酯簇，在溶液中的线性范围分别为 1-250 ppb。尽管线性范围较小，但这些掺杂剂物种的添加增加了分析选择性，并减少了质量控制样品信号的变化。这些数据是使用与线性离子阱质谱仪耦合的大气流动管源获得的，这证明了在监测正离子时，捕获系统适用于大气流动管离子化技术。
