Tenax-TA吸附管热销中 室内空气中TVOC分析

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室内空气中TVOC分析
室内空气中TVOC分析 详细信息：

由于室内空气污染的日趋严重，室内空气检测越来越受到人们的关注。结合实际检测工作，针对GB50325-2001《民用建筑工程室内环境污染控制规范》和GB／T18883-2002《室内环境质量标准》检测苯和TVOC的不足，对分析方法作了较深入的研究，自制了采样管低温控制装置、低温玻璃珠除湿装置，实现了一次采样、一次进样同时得到苯和TVOC的准确分析数据。

另外，根据检测需要，配制了VOCs液态标准物质，研究了制作标准系列管的条件。 GB50325-2001和GB／T18883-2002中规定的热解吸，毛细管气相色谱法，在现场应用Tenax吸附管的采样条件中，规定采样流量为0.5L／min，采样时间为20min，没有规定采样温度，实验操作条件不明确或不甚合理，影响到测定结果的准确性和重现性。

浩瀚色谱（山东）应用技术开发有限公司对此进行了深入研究，发现采样管温度、采样流量和采样时间对苯系物的吸附回收率都有明显的影响。 发现空气中的湿度条件对VOCs回收率影响也很大，在实际采样过程中发现，仅控制采样管的温度，苯的回收率不到90％，而且在低温采样时，经常使得FID检测器熄火。通过在采样管前增加一低温玻璃珠管来除湿，取得很好的效果。 采用低温玻璃珠除湿、控制吸附管采样温度为5℃左右、采样流量在200mL／min、采样时间10min，并用二次热解吸仪直接注入气相色谱，在以上采样条件下，可以TVOC所有组分的吸附热解吸回收率都可以达到90％以上，特别是苯的采样回收率有很大的提高。

室内空气中TVOC分析  测试谱图：




TVOC analysis in indoor air
Analysis of TVOC in indoor air Details:

As indoor air pollution is becoming more and more serious, indoor air testing has attracted more and more attention. Combined with actual testing work, in view of the insufficiency of GB50325-2001 "Code for Indoor Environmental Pollution Control of Civil Construction Engineering" and GB/T18883-2002 "Indoor Environmental Quality Standards" for the detection of benzene and TVOC, a more in-depth study of analytical methods was made, and self-made The sampling tube low-temperature control device and the low-temperature glass bead dehumidification device can obtain accurate analysis data of benzene and TVOC at the same time for one sampling and one injection.

In addition, according to testing needs, liquid VOCs standard materials were prepared, and the best conditions for making standard series tubes were studied. The thermal desorption and capillary gas chromatography specified in GB50325-2001 and GB/T18883-2002, in the sampling conditions of the Tenax adsorption tube used in the field, the sampling flow rate is 0.5L/min, the sampling time is 20min, and the sampling temperature is not specified. , The experimental operating conditions are unclear or unreasonable, which affects the accuracy and reproducibility of the measurement results.

Haohan Chromatography (Shandong) Applied Technology Development Co., Ltd. conducted an in-depth study on this and found that the temperature of the sampling tube, the sampling flow rate and the sampling time all have a significant impact on the adsorption recovery rate of benzene series. It is found that the humidity conditions in the air also have a great influence on the recovery rate of VOCs. In the actual sampling process, it was found that only controlling the temperature of the sampling tube, the recovery rate of benzene was less than 90%, and when sampling at low temperatures, the FID detector was often turned off. . By adding a low-temperature glass bead tube in front of the sampling tube to dehumidify, good results are achieved. Use low-temperature glass beads to dehumidify, control the sampling temperature of the adsorption tube to about 5℃, the sampling flow rate at 200mL/min, and the sampling time for 10min, and use a secondary thermal desorption instrument to directly inject into the gas chromatograph. Under the above optimal sampling conditions, TVOC can be guaranteed The recovery rate of adsorption thermal desorption of all components can reach more than 90%, especially the sampling recovery rate of benzene has been greatly improved.

TVOC analysis test spectrum in indoor air: