Study on optimization of Raman spectroscopy for the detection of diethylhexyl phthalate in PVC plastic
XU Xinxia1, SHEN Xuejing*1,2, CHEN Jiwen3, LIU Jia1, ZHAO Ying1, CUI Feipeng2
1. Central Iron and Steel Research Institute, Beijing 100081, China; 2. NCS Testing Technology Co., Ltd., Beijing 100094, China; 3. North China University of Technology, Beijing 100144, China
Abstract：In order to improve the accuracy and reliability of rapid and quantitative detection of diethylhexyl phthalate (DEHP) in plastics by Raman spectroscopy, the effects of experimental conditions (including sample thickness, laser wavelength, laser power, testing time, noise reduction method, photobleaching time and the number of signal superposition) on the Raman signal intensity of DEHP in PVC matrix were studied. The optimum parameters of Raman spectrum were obtained as follows: the thickness of sample was not less than 5 mm; the wavelength of incident laser was 785 nm; the laser power was not less than 300 mW; the testing time was not less than 2 s; the Raman spectrum of real-time background acquisition was used to reduce the background noise; the photobleaching time was more than 15 s; the number of signal superposition was 10. The limit of detection for DEHP was 0.13%. The mass fraction of DEHP in PVC matrix was significantly reduced from the spectral information reflected in the optimized conditions, which provided a rapid and quantitative analysis method for the detection of low content DEHP by Raman spectroscopy.
徐昕霞, 沈学静, 陈吉文, 刘佳, 赵迎, 崔飞鹏. 拉曼光谱检测PVC塑料中邻苯二甲酸二乙基己基酯的方法优化[J]. 冶金分析, 2021, 41(2): 16-22.
XU Xinxia, SHEN Xuejing, CHEN Jiwen, LIU Jia, ZHAO Ying, CUI Feipeng. Study on optimization of Raman spectroscopy for the detection of diethylhexyl phthalate in PVC plastic. , 2021, 41(2): 16-22.
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