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Sulfur isotope measurement of PM(2.5) air particulate utilizing single collector high resolution inductively coupled plasma-mass spectrometry.

机译：利用单收集器高分辨率电感耦合等离子体质谱法测量PM（2.5）空气颗粒的硫同位素。

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摘要

This paper illustrates an instrumental methodology developed for sourcing aerosol sulfate collected on 2.5 micron particulate (PM2.5) air filters by the use of sulfur isotope ratios signatures. The technique, utilizing a VG Axiom high resolution inductively coupled plasma mass spectrophotometer (HR-ICP-MS) equipped with a single collector, is capable of distinguishing delta 34S values in 24 hour collection-cycle Federal Reference Material (FRM) PM2.5 and in various coal and petroleum sources (+32 to -30 ppt), generating a precision of 0.055 (0.25% RSD) for 32S/ 34S ratio measurements. The technique precludes usage of specialized introduction equipment or sample preconcentration steps while incorporating magnetic rather than acceleration voltage scanning for mass selection as typical of isotope abundance measurements. An additional benefit is that multielemental analyses can be performed utilizing the same sample preparation and equipment setup. The technique was validated using sulfur isotope standard NIST SRM 8556. Results are presented for sulfur isotope ratio measurements on PM 2.5 derived from large-scale combustion experiments of various fuel oils and coals, from EPA air particulate samples gathered in the Saint Louis area and from locally collected air samples.
机译：本文阐述了一种仪器化方法，该方法可通过使用硫同位素比率签名来采购收集在2.5微米微粒（PM2.5）空气过滤器上的硫酸盐气溶胶。该技术利用配备有单个收集器的VG Axiom高分辨率感应耦合等离子体质谱仪（HR-ICP-MS），能够区分24小时收集周期联邦参考物质（FRM）PM2.5和在各种煤炭和石油资源中（+32至-30 ppt），对于32S / 34S比率测量，可产生0.055（RSD的0.25％）的精度。该技术排除了使用专门的导入设备或样品预富集步骤的麻烦，同时结合了磁场而不是加速电压扫描进行质量选择，这是同位素丰度测量的典型方法。另一个好处是可以使用相同的样品制备和设备设置来执行多元素分析。该技术已使用硫同位素标准NIST SRM 8556进行了验证。结果显示了PM 2.5的硫同位素比测量结果，该测量结果来自各种燃料油和煤的大规模燃烧实验，圣路易斯地区和EPA收集的EPA空气颗粒样品以及当地收集的空气样本。

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