二次热解吸直接进样气相色谱法测定空气中苯系物

Secondary Thermal Desorption Directly into the Gas Chromatography for Determination of Benzene Series in Air

文章建立了空气中苯系物的分析方法，方法用Tenax TA吸附管吸附空气中苯系物，二次热解吸直接进毛细管气相色谱分析。该方法定性、定量准确，线性响应良好，回归方程的线性相关系数大于0．9991，相对标准偏差在2．1％～5．3％之间，加标回收率大于92％，具有良好的重现性。测定干扰小，检测灵敏度高，当采样体积1L时，平均解吸率在95％以上，苯系物的最低检出浓度可达0．5ug／m^3。本方法适合测定空气中低浓度的苯系物。

In this paper, a method for monitoring of benzene series in air has been established. They were absorbed Tenax TA adsorption tube, the second thermal desorption directly into the capillary gas chromatography. This method is qualitative, quantitative accuracy, a good linear response, the linear regression equation correlation coefficients greater than 0. 9991, relative standard deviation of are 2. 1% -5.3%, the recovery is greater than 92% , and with good reproducibility. Determination of interference is small, high detection sensitivity, when the sample volume is 1L, the resolution rate was 95%, the minimum detectable benzene concentrations of up to 0. 5ug/m^3. This method is suitable for determination of low concentration in air benzene series.