Determination of Content of Nitrogen in ABS Resin by NIRS

Base on the spectral data of IR diffuse reflection of 58 samples of ABS resin (copolymer of acrylonitrile, butadiene and styrene) and on the application of calibration method of partial least square, a calibration model for determination of nitrogen in the resin was established. As shown by experimental results, highest accuracy was attained in the NIR spectral region of 7 501.8 to 5 449.9 cm-1 when taking 9 as the principal factor number. In the significance test of the model by t-test at the significance level of 0.05, no significant difference was found between the results found by the present method and the results found by the standard method. Values of predictive correlation coefficient (r) and relative standard deviation (RSD, n=7), found were 0.992 4 and 3.3% respectively.