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湿度是高场不对称离子迁移谱(FAIMS)检测的一个重要环境参数。常温常压下,以6种常见的挥发性有机物(丙酮、乙醇、异丙醇、异丁醇、邻二甲苯和对二甲苯)为样品,研究了载气湿度对紫外灯高场不对称离子迁移谱(UV-FAIMS)基于谱峰位置的谱图识别影响。实验结果表明,随着载气湿度的增大,各样品最大谱峰数增加。干燥条件下所选样品的主峰位置都很靠近,大都在5 V附近。随着载气湿度增大,各样品主峰位置发生偏移,且偏移程度不同。因此,选择合适的湿度使各样品谱峰数较少,且谱峰位置差异较大,能提高UV-FAIMS基于谱峰位置谱图识别的准确性。
Humidity is an important environmental parameter for the detection of high field asymmetric ion mobility spectrometry (FAIMS). Under normal temperature and pressure, six common volatile organic compounds (acetone, ethanol, isopropanol, isobutanol, o-xylene and p-xylene) were used as samples to study the effect of carrier gas humidity on the asymmetric ion Migration Spectroscopy (UV-FAIMS) Spectral recognition based on peak position. Experimental results show that with the increase of carrier gas humidity, the maximum peak number of each sample increases. The main peak of the selected sample under dry conditions are very close, mostly in the vicinity of 5V. As the humidity of the carrier gas increases, the positions of the main peak of each sample shift, and the degree of offset varies. Therefore, the selection of the appropriate humidity results in fewer sample peaks and greater differences in peak positions, which can improve the accuracy of UV-FAIMS based on the spectral peak position spectrum identification.