建立了固相吸附热脱附-气相色谱-质谱(TD-GC-MS)综合筛查工业源废气中挥发性有机物(VOCs)的方法。对两种型号的固相吸附管进行了比较,最终选择使用Tenax SS TD Tubes吸附管。气体样品以恒定流速通过吸附管,富集分析物,经热脱附后,用GC-M...建立了固相吸附热脱附-气相色谱-质谱(TD-GC-MS)综合筛查工业源废气中挥发性有机物(VOCs)的方法。对两种型号的固相吸附管进行了比较,最终选择使用Tenax SS TD Tubes吸附管。气体样品以恒定流速通过吸附管,富集分析物,经热脱附后,用GC-MS进行检测,目标化合物以内标法定量,非目标化合物的含量以甲苯的响应系数计算。方法检出限为1.06~5.44 ng,以采样体积300 mL计算,目标化合物的检出限为0.004~0.018 mg/m^3。吸附管平均加标回收率为78.4%~89.4%,相对标准偏差为3.9%~14.4%(n=7)。应用该方法对大连市某垃圾焚烧发电厂排放的废气进行VOCs目标及非目标化合物综合筛查,共检出29种VOCs,其中仅5种VOCs为预先设定的目标化合物,另外24种为非目标化合物,5种目标化合物含量仅占所有检出物总量的26.7%。证明了工业源废气VOCs分析中非目标化合物筛查的重要性,该研究思路对完整测定工业源挥发性有机污染物分布具有一定的借鉴意义。展开更多
A method for the determination of xylene residues in macroreticular resin by thermal desorption-gas chromatography-mass spectrometry was established in this paper.The analysis was carried out on a DB-5 capillary colum...A method for the determination of xylene residues in macroreticular resin by thermal desorption-gas chromatography-mass spectrometry was established in this paper.The analysis was carried out on a DB-5 capillary column (10μm×0. 25mm×30m). The effect of the desorption temperature on desorption mass of xylene to was discussed. The result showed that the relative coefficient was 0. 999 4. The relative standard deviation was 5.6%, and the mininum detection limit of xylene was 6.9× 10^-10g.展开更多
文摘A method for the determination of xylene residues in macroreticular resin by thermal desorption-gas chromatography-mass spectrometry was established in this paper.The analysis was carried out on a DB-5 capillary column (10μm×0. 25mm×30m). The effect of the desorption temperature on desorption mass of xylene to was discussed. The result showed that the relative coefficient was 0. 999 4. The relative standard deviation was 5.6%, and the mininum detection limit of xylene was 6.9× 10^-10g.
