High-resolution measurement of multiple volatile organic compounds dissolved in seawater using equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS)
High-resolution measurement of multiple volatile organic compounds dissolved in seawater using equilibrator inlet-proton transfer reaction-mass spectrometry (EI-PTR-MS)
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DOI：
10.1016/j.marchem.2010.08.003
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发表时间：
2010-10
期刊：
影响因子：
3
通讯作者：
S. Kameyama;H. Tanimoto;S. Inomata;U. Tsunogai;A. Ooki;S. Takeda;H. Obata;A. Tsuda;M. Uematsu
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文献类型：
--
作者：
S. Kameyama;H. Tanimoto;S. Inomata;U. Tsunogai;A. Ooki;S. Takeda;H. Obata;A. Tsuda;M. Uematsu
我们开发了一种平衡器入口-质子转移反应-质谱 (EI-PTR-MS) 系统，用于高分辨率测量溶解在海水中的多种挥发性有机化合物 (VOC) 的浓度。通过一系列实验室实验评估了海水样品和载气之间五种 VOC（异戊二烯、丙烯、丙酮、乙醛和甲醇）的平衡以及系统的响应时间。尽管异戊二烯和丙烯在海水样品和平衡器中的载气之间未达到平衡（可能是因为它们的水溶性较低），但其他物质确实达到了平衡。 EI-PTR-MS 系统是在北太平洋西部的一次研究巡航期间部署的。对几种海水采样方法的评估表明，采样装置对目标挥发性有机物没有明显污染。对于异戊二烯，EI-PTR-MS 测量值与膜平衡器-气相色谱/质谱系统测量值的比较显示出总体良好的一致性（R2=0.79）。 EI-PTR-MS 捕获了溶解 VOC 的时间变化，包括小范围变化，这表明 EI-PTR-MS 系统的性能足以同时连续测量海水中对环境具有重要性的多种 VOC。
We developed an equilibrator inlet–proton transfer reaction-mass spectrometry (EI–PTR-MS) system for high-resolution measurement of the concentrations of multiple volatile organic compounds (VOCs) dissolved in seawater. The equilibration of five VOCs (isoprene, propene, acetone, acetaldehyde, and methanol) between seawater samples and the carrier gas, and the response time of the system, were evaluated by means of a series of laboratory experiments. Although equilibrium between the seawater sample and the carrier gas in the equilibrator was not achieved for isoprene and propene (likely because of their low water solubility), the other species did reach equilibrium. The EI–PTR-MS system was deployed during a research cruise in the western North Pacific Ocean. Evaluation of several seawater sampling methods indicated that there was no significant contamination from the sampling apparatus for the target VOCs. For isoprene, comparison of EI–PTR-MS measurements with measurements obtained with a membrane equilibrator–gas chromatography/mass spectrometry system showed generally good agreement (R2=0.79). EI–PTR-MS captured the temporal variations of dissolved VOCs, including small-scale variability, which demonstrates that the performance of the EI–PTR-MS system was sufficient for simultaneous and continuous measurements of multiple VOCs of environmental importance in seawater.