ABSTRACT
Recently, the indoor air pollution, especially the volatile organic compounds (VOCs) is attracting more and more attention. The determination of indoor air organic gases becomes the key issue. In the present paper, a simultaneous quantitative measuring method of indoor air multi-component VOCs was established based on FTIR combined with chemometrics. The 3 200-2 600 cm(-1) and 1 100-600 cm(-1) bands of IR spectrum were used to establish validation model, and excellent coefficients were obtained (r(2) =0. 970, 0. 955 and 0. 946 for benzene, toluene and dimethylbenzene, respectively). The root mean standard error of calibration for benzene, toluene and dimethylbenzene is 0. 074 2, 0. 081 9 and 0. 087 7, respectively. The root mean standard error of prediction is 0. 132, 0. 134 and 0. 033 3, respectively. The error of unknown sample prediction is acceptable. The IR method is effective for simultaneous analysis of indoor air multi-component VOCs. The model established by partial least squares (PLS) is better than that by principal components analysis (PCR).
