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Citation: LIU Jing, HUANG Qingdan, WANG Yong, ZENG Lian, ZHANG Yaru. Determination of impurity components in the perfluoroisobutyrile based on home-made gas-circulating system[J]. Chinese Journal of Chromatography, ;2020, 38(5): 606-610. doi: 10.3724/SP.J.1123.2019.10014 shu

Determination of impurity components in the perfluoroisobutyrile based on home-made gas-circulating system

Electric Power Test and Research Institute, Guangzhou Power Supply Co. Ltd., Guangzhou 510410, China

Corresponding author: HUANG Qingdan, greengasguangzhou@163.com
Received Date: 15 October 2019

Fund Project: Key Technology Project of China Southern Power Grid (No. GZJKJXM20170330).

A method for the determination of impurity components in perfluoroisobutyrile (C₄F₇N) gas was established by setting up a sealed pipe gas composition test system comprising an automatic six-way valve and gas chromatography-tandem mass spectrometry (GC-MS) apparatus. C₄F₇N commercial gases were purchased from an abroad company (AC company) and a domestic Chinese company (DC company). These gases were subjected to qualitative and quantitative analyses by our test system and separated on an Agilent GS-GASPRO column (30 m×0.32 mm×5 μm). The results showed that the C₄F₇N commercial gas contained N₂, O₂, C₃HF₇ and a trace amount of C₃F₆. In the C₄F₇N commercial gas from the AC company, the total amount of impurities was 0.13%, and the C₄F₇N content was 99.87%. In the C₄F₇N gas from DC Company, the total amount of impurities was 0.83%, and the C₄F₇N content was 99.17%. The C₄F₇N contents of the gases from both the companies were consistent with the claimed value (≥ 99%). The determination of the impurities C₄F₇N can be beneficial for the subsequent study of its insulation performance and thermal stability.
- gas chromatography-tandem mass spectrometry(GC-MS),
- impurity determination,
- perfluoroisobutyrile (C₄F₇N),
- newly insulating gas
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