1. College of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
2. Analysis and Test Center of Hainan University, Haikou Municipal Key Laboratories of Analysis and Test for Neo-drug Research & Development，Haikou 570228, China
3. Institute of Analysis and Testing, Beijing Academy of Science and Technology (Beijing Centre for Physical and Chemical Analysis), Beijing Key Laboratory of Organic Materials Testing Technology and Quality Evaluation, Beijing 100089, China
Abstract：A law on the one-time use of plastics was carried out as one measure of protecting the ecological environment in Hainan Province of China. The Hainan Forbidden Plastic List (first batch) is regulated to prohibit six non-degradable plastic compositions. The polyethylene (PE) and ethylene-vinyl acetate copolymer (EVA) were selected as detection targets in this simulating illicit-adding system. Poly(butylene adipate-co-terephthalate (PBAT) and polylactic acid (PLA) were chosen as the blend portions of simulating composites for their extensive application in bio-degradable plastics products. Then PE was blended with PBAT and PLA, respectively, according to the different mass percentages. Moreover, EVA was also blended with PBAT and PLA with the same formula, respectively. These simulating samples were provided for qualitative and quantitative testing of PE and EVA by Fourier transform infrared spectroscopy (FTIR) and cluster analysis (CLA). Their spectra screened the qualitative characteristic peaks by peak shape and wavenumbers. Furthermore, the characteristic quantitative peaks were screened for the correlation of peak-high ratios and the content of the non-degradable plastic components. Their quantitative curves were obtained and used for blind verification. The results showed that the mixture can be divided into three categories by applying all original spectral data in a chemometric method within 4 000 to 400 cm-1 and the parameter of the classification model are A=14, R2X(cum)=0.997, Q2(cum)=0.992. The qualitative characteristic peaks of the PE-PBAT and EVA-PBAT systems were 2 918 and 2 850 cm-1, while the characteristic quantitative peaks were 2 918, 2 850, 1 714 and 727 cm-1. The characteristic qualitative peaks of the EVA-PLA system were 2 918, 2 850, 1 237 and 718 cm-1, and the characteristic quantitative peaks were 2 918, 2 850 and 1 740 cm-1. For the PE-PLA system, the characteristic qualitative peaks were 2 918, 2 850 and 718 cm-1, and the characteristic quantitative peaks were 2 918, 2 850 and 1 747 cm-1.Otherwise, the 1 460 cm-1 band intensity could be used to assist in quantification that was not related to component distribution. The qualitative classification results of ATR-FTIR were consistent with principal component analysis (PCA) classification. Furthermore, the quantitative models were established by the Spectrum Quant software. Peak-high ratios and non-degradable components had a great a high correlation. The peak-high ratio of 2 918/727 and PE or EVA content had high correlation in PBAT-base blend material. The peak-high ratio of 2 918/1 740 was determined as the dependence of the EVA content in the EVA-PBAT material. The peak-high ratio of 2 918/1 460 was defined as the dependence of the PE content in the PE-PLA material. The blind verification results indicated that the inaccuracy is within ±2.7%. Therefore, the FTIR technology showed good reliability in the qualitative and quantitative analysis of prohibited non-degradable plastic components, which could provide a scientific basis for identifying of non-biodegradable materials.
尚超男，谢艳丽，高 峡，周雪晴，赵振东，马佳鑫，崔 芃，魏晓晓，冯玉红，张名楠. 基于FTIR光谱技术对可生物降解材料中添加PE/EVA组分的定性定量分析[J]. 光谱学与光谱分析, 2022, 42(11): 3380-3386.
SHANG Chao-nan, XIE Yan-li, GAO Xiao, ZHOU Xue-qing, ZHAO Zhen-dong, MA Jia-xin, CUI Peng, WEI Xiao-xiao, FENG Yu-hong, ZHANG Ming-nan. Research on Qualitative and Quantitative Analysis of PE and EVA in Biodegradable Materials by FTIR. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(11): 3380-3386.
