Studies on Illegal Additive Industrial Gelatin Detection by Terahertz Spectroscopy

Abstract:

Terahertz spectroscopy technique was used to test industrial gelatin in order to qualitative and quantitative analysis and it was shown that characteristic absorption peak appear in absorption spectra. The characteristic absorption peak was 1.55 THz. In addition，there was significant absorbtion when the concertration of industrial gelatin was 1.57%. The lowest absorbtion baseline sample was selected as basement with 0%，50% and 70% PE powder to produce positive samples by adding different proportion industrial gelatin. The results show that there was best absorbtion peak of samples mixed with 70% PE powder due to the lowest absorbtion baseline. Moreover，there was significant absorbtion when the concertration of industrial gelatin was above 5%. There is a significant linear relationship between the peak height of characteristic absorption peak and the concentration of industrial gelatin. Therefore，terahertz spectroscopy can be used for qualitative and quantitative analysis of industrial gelatin.