Real-time monitoring traces of SF₆ in near-source ambient air by ion mobility spectrometry
2019
Huang, Wei | Wang, Weiguo | Chen, Chuang | Li, Yang | Wang, Zhenxin | Li, Qingyun | Li, Mei | Hou, Keyong
The leakage of sulphur hexafluoride (SF₆) gas threats the global climate changes and personnel safety. Monitoring the concentration of SF₆ in its application places is an industry regulation. In this study, ion mobility spectrometry (IMS) was developed for fast monitoring traces of SF₆ in near-source ambient air. Due to the water is an important part of the natural air and affects most atmospheric measurements, the operating parameters of IMS monitoring SF₆ were optimised for quantitative analysis of SF₆ at different relative humidity (RH). It is discovered two main product ions SF₆⁻ and SOF₄⁻ by IMS at different RH. The calibration curves of SF₆ were investigated by its relationship with the peak intensity of SOF₄– for real application. The time resolution of the measurement was obtained less than 1 s and the limit of detection (LOD) achieved 0.16–0.68 ppm with a data averaging of 30 times. At last, the simulated application of monitoring SF₆ leakage was tested in the fume hood of our lab. The results showed a great potential application prospect of IMS in monitoring SF₆ in the ambient air of its application places.
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