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室內空氣中TVOC分析
室內空氣中TVOC分析 詳細信息：

由于室內空氣污染的日趨嚴重，室內空氣檢測越來越受到人們的關注。結合實際檢測工作，針對GB50325-2001《民用建筑工程室內環境污染控制規范》和GB／T18883-2002《室內環境質量標準》檢測苯和TVOC的不足，對分析方法作了較深入的研究，自制了采樣管低溫控制裝置、低溫玻璃珠除濕裝置，實現了一次采樣、一次進樣同時得到苯和TVOC的準確分析數據。

另外，根據檢測需要，配制了VOCs液態標準物質，研究了制作標準系列管的條件。 GB50325-2001和GB／T18883-2002中規定的熱解吸，毛細管氣相色譜法，在現場應用Tenax吸附管的采樣條件中，規定采樣流量為0.5L／min，采樣時間為20min，沒有規定采樣溫度，實驗操作條件不明確或不甚合理，影響到測定結果的準確性和重現性。

浩瀚色譜（山東）應用技術開發有限公司對此進行了深入研究，發現采樣管溫度、采樣流量和采樣時間對苯系物的吸附回收率都有明顯的影響。 發現空氣中的濕度條件對VOCs回收率影響也很大，在實際采樣過程中發現，僅控制采樣管的溫度，苯的回收率不到90％，而且在低溫采樣時，經常使得FID檢測器熄火。通過在采樣管前增加一低溫玻璃珠管來除濕，取得很好的效果。 采用低溫玻璃珠除濕、控制吸附管采樣溫度為5℃左右、采樣流量在200mL／min、采樣時間10min，并用二次熱解吸儀直接注入氣相色譜，在以上采樣條件下，可以TVOC所有組分的吸附熱解吸回收率都可以達到90％以上，特別是苯的采樣回收率有很大的提高。

室內空氣中TVOC分析  測試譜圖：




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: