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The most serious problem in multivariate calibration analysis is that the prediction samples may contain the interferents whch are not modeled in the calibration step. Then how to detect the interferents and eliminate their influence is si&icantly important in order to obtain the correct compositional analysis results. The so-called residual spectra library search is supplied and an iterative loop regression algorithm to successfully correct the spectrum containing two interferents is developed in t h s paper. Three groups of whch each sample contains no, one or two interferents are supplied to amplify the above method. The mean relative standard deviation (RSD) for the three groups are 0.163, 0.375, 0.355%, respectively. There are no . 1452 GU ET AL.comparable difference among these RSDs, which proves the validation of the method provided in this paper. The results specify that PLS with FTIR spectroscopy is a powerful tool to resolve both the multicomponent simultaneous determination and the identification of interferents when combined with additional diagnostic and corrected procedure.

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Remote Sensing Fourier Transform Infrared Emission Spectroscopy was applied to the study of Freon-12 thermal fragmentation in alcohol / air flame. The concentration of the products and the temperature of the flame were calculated. The results show that, this method can be used to monitor freons. In addition, this method has potential in combustion chemistry, for combustion characteristics can be given by measuring the spectral lines and calculating.

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