Determination of total volatile organic compounds by thermal desorption-gas chromatography in indoor air

Objective:To the code for indoor environmental pollution control of civil building engineering-GB50325-2001.A method have developed for determination of the total volatile organic compounds in indoor air by thermal desorption/gas chromatography-hydrogen flame ionixation detector.Methods:The total volatile organic compounds in indoor air or mixed standard solutions were adsorbed by Tenax-TA thermal desorption tubes,then desorbed by thermal desortpion and detected by gas chromatography.Results:The experimental results indicated that the linear range were wide,the precise were high,The detection limits were 0.2 ng～0.3 ng,and the relative standard deviations(RSD) were 0.31%～2.6%,the minimum detection concentration were 0.0002 mg/m3～0.0003 mg/m3(the air volume=5.0 L).Conclusion:It is a quick,accurate,sensentive method to detect the total volatile organic compounds in indoor air by thermal desorption/gas chromatography-hydrogen flame ionixation detector.Even most of the unknown compounds in indoor air can be recongnized by 54 volatile organic compounds.