Development of an ionization method using hydrogenated plasma for mass analysis of surface adhesive compounds,Journal of Analytical Atomic Spectrometry

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Development of an ionization method using hydrogenated plasma for mass analysis of surface adhesive compounds
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-02-06 00:00:00 , DOI: 10.1039/c7ja00314e
Mari Aida _{1,

2,

3,

4} , Takahiro Iwai _{4,

5,

6} , Yuki Okamoto _{2,

4,

7,

8} , Hidekazu Miyahara _{2,

4,

7,

8} , Yasuo Seto _{4,

9} , Akitoshi Okino _{2,

4,

7,

8}

Affiliation

Currently, atmospheric plasmas are applied to the desorption and ionization of surface adhesive materials for rapid and highly sensitive analysis. One widely used chemical ionization method applies protons generated from atmospheric water molecules to a desorbed sample; however, a detailed study of the ionization mechanism has not been addressed thus far. Therefore, this paper proposes an ionization method that adds a small, optimized amount of hydrogen to the helium plasma for generating protons in the sample ionization source. Using this technique, mass spectrometry was performed on the sample surface deposits of 2-isopropylpyridine and 4-isopropylaniline. The hydrogen flow rate was optimized to the addition ratio of 2%, and the lowest limit of detection achieved is 0.1 and 42 pmol for 2-isopropylpyridine and 4-isopropylaniline, respectively. By optimizing the hydrogen addition flow rate, the optimum number of protons for sample ionization was attained, and it became possible to realize control of proton content in the sample, irrespective of humidity and surrounding environmental factors during mass spectrometry.

中文翻译：

开发一种使用氢化等离子体进行表面胶粘剂质量分析的电离方法

当前，大气等离子体被应用于表面粘合材料的解吸和电离，以进行快速而高度灵敏的分析。一种广泛使用的化学电离方法将大气水分子产生的质子施加到解吸的样品上。然而，到目前为止，尚未解决对电离机理的详细研究。因此，本文提出了一种电离方法，该方法可向氦等离子体中添加少量优化的氢气，以在样品电离源中产生质子。使用该技术，对2-异丙基吡啶和4-异丙基苯胺的样品表面沉积物进行了质谱分析。将氢气流速优化为2％的添加比例，对于2-异丙基吡啶和4-异丙基苯胺，最低检测限分别为0.1和42 pmol。

更新日期：2018-02-06

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