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分析化学  2013 

大气中气相和颗粒相三氟乙酸浓度测定

DOI: 10.3724/SP.J.1096.2013.30042, PP. 1140-1146

Keywords: 三氟乙酸,采集,环形扩散管,衍生,GC/MS,气固分配系数

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Abstract:

建立了我国大气中气相和颗粒相三氟乙酸(Trifluoroaceticacid,TFA)的采集和分析方法。采用环形扩散管-滤膜联用装置分离气相和颗粒相,利用环形扩散管的碱性涂层吸附气相TFA,石英滤膜吸附颗粒相物质。对气相和颗粒相样品分别处理,以2,4-二氟苯胺作为衍生剂,与TFA反应生成TFA的苯胺产物,采用GC/MS进行分析。本方法在0.31~4.91μg/L浓度范围内呈线性关系(R2=0.9991),检出限为66ng/L。采样装置回收率为(101±3)%,当采样量为48m3,TFA大气浓度检出限为31pg/m3。于2012年4~10月在北京大学采样点采集大气,测得其中TFA总浓度在501~7447pg/m3范围,TFA在气相中的浓度大于在颗粒相中的浓度,气固分配系数Kp随温度变化。

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