氮MICAP与后等离子体电离质谱法用于元素氟定量†

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Jordan L. Tanen and Kaveh Jorabchi
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引用次数: 0

摘要

高功率氮微波等离子体的最新发展使其成为元素分析的有吸引力的激发和电离源,提供强大的操作和液体样品导入,并显着节省成本。然而,与Ar-ICP相比,这些等离子体的激发和电离温度较低,因此非金属检测,特别是F分析仍然具有挑战性,而由于药品和环境污染物中含氟化学品的普遍存在,对元素F分析的需求继续增加。本文将N2微波电感耦合大气压等离子体(MICAP)与等离子体后化学电离的优点结合起来,对元素F的分析方法进行了评价。MICAP作为一个强大的等离子体反应器,将氟化学物质分解成HF,然后电离成ScFNO3(H2O)n+,并在源内离子激活后被四极质谱仪检测为ScF+。该方法的灵敏度为~ 18 cps ng−1 mL F,优于<;Ar-ICP-MS/MS中BaF+检测为4 cps ng−1 mL F。得到的F的LOD为~ 40 ng mL−1,与Ar-ICP-MS/MS相当,受可能以F污染为主的背景等效浓度的限制。当样品引入偏差最小化时,响应因子也与化学物质无关。然而,观察到流动注射峰随着时间的推移而变宽,特别是在气溶胶气体中含氧量高的情况下,这表明未来需要改进以获得更好的分析性能。这些研究表明,MICAP与等离子体后化学电离对F的定量具有很高的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nitrogen MICAP with post-plasma ionization mass spectrometry for elemental fluorine quantitation†

Recent developments in high-power nitrogen microwave plasmas have made them attractive excitation and ionization sources for elemental analysis, offering robust operation with liquid sample introduction and significant cost savings. However, nonmetal detection, particularly F analysis, remains challenging with these plasmas because of their lower excitation and ionization temperatures compared to Ar-ICP while the need for elemental F analysis continues to rise due to prevalence of fluorochemicals in pharmaceuticals and environmental contaminants. Here, we combine the advantages of a N2 microwave inductively coupled atmospheric pressure plasma (MICAP) with those of post-plasma chemical ionization and evaluate the approach for elemental F analysis. The MICAP acts as a robust plasma reactor to break down fluorochemicals into HF which is then ionized to ScFNO3(H2O)n+ and detected by a quadrupole MS as ScF+ after in-source ion activation. The approach offers a sensitivity of ∼18 cps ng−1 mL of F, superior to < 4 cps ng−1 mL of F achieved by BaF+ detection in Ar-ICP-MS/MS. An LOD of ∼40 ng mL−1 of F is obtained comparable to those of Ar-ICP-MS/MS, limited by background equivalent concentration likely dominated by F contamination. F response factors are also independent of chemical species when sample introduction biases are minimized. However, broadening of flow injection peaks over time is observed, especially with high oxygen levels in the aerosol gas, denoting future areas of improvement for better analytical performance. These studies indicate a high potential of MICAP with post-plasma chemical ionization for F quantitation.

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来源期刊
CiteScore
6.20
自引率
26.50%
发文量
228
审稿时长
1.7 months
期刊介绍: Innovative research on the fundamental theory and application of spectrometric techniques.
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