湿度对UV-FAIMS基于谱峰位置的谱图识别影响

Effects of Humidity on the UV-FAIMS Spectrum Identification Based on the Positions of the Spectrum Peaks

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 a key environment parameter to the high-field asymmetric waveform ion mobility spectrometry（FAIMS）.At the ambient temperature and pressure,with the six common volatile organic compounds（VOCs）（acetone,ethanol,2-propanol,2-butanol,O-xylene and P-xylene）as the samples,the effects of the carrier gas humidity on the ultraviolet lamp high-field asymmetric waveform ion mobility spectrometry（UV-FAIMS）spectrum identification based on the position of the spectrum peak were studied.The results show that the number of the maximum peak of the samples increases with the increase of the carrier gas humidity.Under the dry condition,the main peak positions of the selected samples are very close,mostly around 5 V.With the increase of the carrier gas humidity,the main peak positions of the samples offset and the deviation degrees are different.Therefore,through choosing a suitable humidity,the spectral peak number of the samples is less while the difference of the spectral peak position is greater,thus the accuracy of the UV-FAIMS spectrum identification based on the spectrum peak location can be improved.