不同地区rPET样品中半挥发性有机物的筛查识别及差异分析  

Quantitative Identification and Difference Analysis of Semi-volatile Organic Compounds in rPET Samples from Different Regions

作　　者：吴思亮 李丹 谭智毅 吴学峰 李函珂 苏启枝 钟怀宁 郑建国 WU Si-liang;LI Dan;TAN Zhi-yi;WU Xue-feng;LI Han-ke;SU Qi-zhi;ZHONG Huai-ning;ZHENG Jian-guo(Guangzhou Customs District Technology Center,Guangzhou 510623,China)

机构地区：[1]广州海关技术中心,广州510623

出　　处：《包装工程》2023年第19期1-8,共8页Packaging Engineering

基　　金：国家重点研发计划项目(2022YFF0607202);国家自然科学基金青年基金项目(42207550)。

摘　　要：目的探究回收聚对苯二甲酸乙二醇酯(Recycled Polyethylene Terephthalate,rPET)的半挥发性污染物分布和地域差异性。方法本文利用全二维气相色谱-四极杆飞行时间高分辨质谱(GC×GC-QTOF-MS)非靶向筛查不同区域rPET中的半挥发性有机物质(SVOC),结合正交偏最小二乘法判别分析(OPLS-DA)探索区域间的差异、关键差异物质和影响因素。结果北方地区和广东地区的rPET分别检出260和90种SVOCs;1,1’-[1,2-乙二酰双(氧基)]双苯和壬醛二甲基缩醛均是检出频率最高的物质;OPLS-DA结果证明广东地区和北方地区的rPET之间存在显著差异(RC2YU M为0.98,QC2YUM为0.932)。关键差异物质主要包括邻苯二甲酸二丁酯、十一烷和对苯二甲酸二乙二醇酯。结论添加剂、其他废塑料的降解产物以及香精香料残留等因素是导致rPET区域差异的主要原因,不同区域间rPET中的半挥发性污染物存在显著差异,因此可以通过半挥发性有机物质结合化学计量学方法对rPET的来源进行溯源分析。The work aims to investigate the distribution and regional difference of the semi-volatile contaminants of recycled PET(rPET).Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry(GC×GC-QTOF-MS)was used to tentatively identify the semi-volatile organic compounds(SVOCs)from different re-gions,after which OPLS-DA was performed to investigate the regional difference,key different compounds and their af-fecting factors.A total of 90 and 260 semi-volatile organic compounds were tentatively identified in rPET from Guang-dong region and north region,respectively.In the meantime,1,1'-[1,2-oxalylbis(oxy)]bisphenyl and nonanal dimethyl acetal were the most frequently detected semi-volatile organic compounds.Furthermore,OPLS-DA revealed that R_(CUM)^(2Y)and Q_(CUM)^(2Y)accounted for 0.98 and 0.932,proving that significant differences were observed in the semi-volatile organic compounds of rPET from Guangdong region and north region.Herein,dibutyl phthalate,undecane,2-hydroxyethyl me-thyl terephthalate were the key different compounds.The regional difference of rPET is attributed to the additives,de-gradation of other plastics,and residuals of fragrances.The semi-volatile organic compounds in rPET differ significant-ly between regions and regional traceability of rPET can be achieved by combining semi-volatile organic compounds with chemometrics.

关 键 词：回收聚对苯二甲酸乙二醇酯 半挥发性有机物质 全二维气相色谱-飞行时间质谱 正交偏最小二乘法判别分析 溯源分析 

分 类 号：O657.63[理学—分析化学] O741.6[理学—化学]