Research On The Monitoring Method Of VOC In Indoor Environment

This paper mainly used solid adsorbent tube to sample ethanol, acetone, pentane, ether, hexane, chloroform, benzene, cyclohexane, heptane, toluene and xylene in indoor air , and built solvent desorption/capillary gas chromatography method to monitor VOCs in indoor environment. Sampling and analysis conditions have been experimented, such as adsorbents, desorption time, inlet temperature, column temperature, split ratio, detector temperature and so on, and optimized the operating conditions.The performances of volatile organic compounds are as follows: the standard curves are in good linear relation, and the relative standard deviations are 1.7%～9.4%, the recoveries are between 90% and 110%, the average desorption efficiencies are over 80%, and most achieved 90%, the detect limits of the method are lower, in line with the criterion requirements. Organic compounds are laid in active carbon tube for seven days, the loss rates are 0.3%～5.6%, so it can be kept seven days after sampling. Compared with packed column gas chromatography method of the National Occupational Health Standards"methods for determination in the air of workplace 160-2004 GBZ/T", the detect limits of the method are lower, the average desorption efficiencies are higher, and the breakthrough capacities of single compounds are larger, so performances of the method are superior to that of standard method.Using silica gel and active carbon tube to carry though sampling and analysis, it discovered that active carbon tube is superior to silica gel. Some laboratories of College of Chemistry and Chemical Engineering were carried through sampling and analysis of VOCs by the built monitoring method, and the concentrations in indoor air are lower than occupational exposure limits, in line with occupational health design standard.