热脱附～气相色谱法对空气中苯系物测试精度的实验研究

EXPERIMENTAL STUDY ON THE ACCURACY OF ANALYSIS OF BTEX IN THE AIR BY TCT-GC

空气中苯系物的热脱附～气相色谱分析法具有精度高,预处理过程无有机溶剂参与的优点。通过优化的实验流程开展研究,对实验对象得到了优于4 ng的分析灵敏度。对10 ng左右的标准样品进行六次进样分析,相对标准偏差最大为10.3%,重复性较好。对20 ng左右的有证标准样进行六次分析,分析相对误差最大为10%。经实验表明,采用热脱附～气相色谱法分析空气中痕量苯系物具有独特优势。

The method of thermal desorption-gas chromatography has the relative advantages of high accuracy and no. use of organic solvents. By the research of the optimized conditions, the high sensitivity of less than 4 ng in analysis has been achieved. We analysed the standard samples which containing the target objects about 10 ng for 6 times, and the RSD was no more than 10.3%. It has good repeatability. We analysed the standard samples which containing the target objects about 20 ng for 6 times, and the RE of analysises was no more than 10%. The result showed that the analysis of BTEX in the air by TCT-GC has special advantages.