中文摘要：

本研究采用紫外光离子源-高场不对称波形离子迁移谱（UV-FAIMS）快速检测环境中挥发性有机物。选取苯和对二甲苯为研究对象,并分析了分离电压、流速等因素对其分离识别的影响。实验结果表明：当分离电压值为0~1200V时,苯和对二甲苯信号强度逐渐降低,而特征补偿电压值却逐渐增加。实验选取分离电压值为900V,当载气流速为0~240L/h时,苯和对二甲苯的特征离子峰信号强度逐渐增加,当载气流速为0~120L/h时,苯和对二甲苯团簇峰信号强度增加,当载气流速为120~240L/h时,苯的团簇峰信号强度增加,而对二甲苯的团簇峰信号强度降低。此外,对样品浓度、信号强度与噪声的比值进行探讨,获得UV-FAIMS检测苯的检测限为0.011mg/m^3。

英文摘要：

In this paper, the detection of volatile organic compounds（VOCs） by ultraviolet ion source-high field asymmetric waveform ion mobility spectrometry（UV-FAIMS） was studied. Benzene and p-xylene were chosen as samples to study the impact of the dispersion voltage and the carrier gas flow rate on the detection sensitivity of the system. The results show that the output signal intensity for both benzene and p-xylene decreases gradually when the dispersion voltage varies from 0 to 1 200 V,while the signal peak position shifts to a higher dispersion voltage. Then we studied the effect of the carrier gas flow rate. 900 V was chosen as the dispersion voltage and the carrier gas flow rate was changed from 0 to 240 L/h in this experiment. In this case, the signal intensities for both benzene and p -xylene increase steadily. However,the benzene and p-xylene cluster signals behave differently. Specifically, the peak intensity of benzene signal increases with the increase of the carrier gas flow rate. As for p-xylene signal, the peak intensity increases when the flow rate is less than 120 L/h and then undergoes a drop when the flow rate goes higher than 120 L/h. In addition, other effects such as the sample concentration and the signal-to- noise ratio of the UV-FAIMS system were discussed. Based on our experiment results,we found that the detection limit of benzene was 0. 011 mg/m^3.