二氧化碳在测定环境空气中含氟化合物的影响研究  

Study on the Effects of Carbon Dioxide on the Presence of Fluorocarbons in Ambient Air

作　　者：戴维 王美飞 尹明明 Dai Wei;Wang Meifei;Yin Mingming(Nanjing Environmental Monitoring Center,Nanjing 210013,China)

机构地区：[1]江苏省南京环境监测中心,江苏南京210013

出　　处：《广东化工》2022年第5期140-142,共3页Guangdong Chemical Industry

摘　　要：采用罐采样-大气浓缩仪-气相色谱质谱法测定环境空气中三氟甲烷、六氟乙烷和六氟化硫等低沸点含氟化合物时,选用CP-silica PLOT色谱柱分析,二级冷阱温度在-140℃左右时具有较好的捕集效果。但此时有大量二氧化碳被捕集、浓缩,随目标组分一起进入色谱柱,对分析结果产生严重影响。通过在不锈钢采样罐前端加装除二氧化碳小柱进行采样的方式,去除环境空气样品中的二氧化碳,可显著降低分析时二氧化碳对目标组分的影响,且对目标组分回收率无明显影响。When using tank sampling-atmospheric concentrator-gas chromatography mass spectrometry to determine the low boiling point fluorine compounds such as trifluoromethane, hexafluoroethylene and sulfur hexafluoride in ambient air, CP-silica PLOT column analysis was used, and the temperature of the secondary cold trap had a good catch effect at about-140 ℃. But at this time there was a large amount of carbon dioxide arrested and concentrated, with the target components into the column, which had a serious impact on the analysis results. By installing a carbon dioxide removal cartridge at the front of the stainless steel tank for sampling, the carbon dioxide in the ambient air sample is removed, which can significantly reduce the influence of carbon dioxide on the target components during analysis, and has no obvious impact on the recovery rate of the target components.

关 键 词：环境空气 含氟化合物 二氧化碳 钠石灰 气质联用法 大气浓缩仪 

分 类 号：TQ[化学工程]