柱后切换及程序升温气相色谱法测定六氟化硫气体中痕量一氧十氟化二硫

本工作提供了用柱后切换和程序升温技术测定纯六氟化硫气体中痕量有毒杂质Ｓ２Ｆ１０Ｏ含量的气相色谱方法。用火焰光度检测器检测，进样量为 １ｍＬ时，Ｓ２Ｆ１０Ｏ最小检测浓度为５×１０－７（ｍｏｌ／ ｍｏｌ）。

Gas Chromatographic Determination of Trace Bispentafluorosulfur Oxide in Sulfur Hexafluoride Using a Post-column Switching and Temperaters Programming Method

A gas chromatographic method utilizing post-column switching and temperature programming for the determination of trace S2,F10 O is presented. The column oven was set at a low temperature for separating the trace S2 F10 O form the major constituent SF6. Then the column temperature was increased to a high temperature to speed up the elution of S2F10, O and switched it into flame photometric detector (FPD) by a four-port valve after the main part of SF6 was flowed out of the thermal conductivity detector and a vent line. The detection limit of S2 F10 O in SF6 measured by FPD was 5 x 10-7 mol/mol for 1 mL SF6 sample.