YE Zhi-kang,ZENG Ying,LIN Qin-bao,et al.Determination of Volatile Organic Compounds in Recycled Polyethylene Terephthalate by SPME/GC × GC-QTOF MS[J].Journal of Instrumental Analysis,2021,40(11):1596-1603.
YE Zhi-kang,ZENG Ying,LIN Qin-bao,et al.Determination of Volatile Organic Compounds in Recycled Polyethylene Terephthalate by SPME/GC × GC-QTOF MS[J].Journal of Instrumental Analysis,2021,40(11):1596-1603. DOI: 10.19969/j.fxcsxb.21073005.
Determination of Volatile Organic Compounds in Recycled Polyethylene Terephthalate by SPME/GC × GC-QTOF MS
Polyethylene terephthalate(PET) is an excellent material for recycling due to its low diffusivity and low sorption features.The ideal recycling is to use the recycled PET(rPET) material for the initial intended use.There are some intentionally added and non-intentionally added risk substances in rPET.There will be some safety risks if these substances migrate into food.Due to insufficient data on rPET pollutants for safety assessment,rPET cannot be used in food contact materials in China.In this study,a method was established for the analysis of volatile organic compounds(VOCs) in rPET using comprehensive two-dimensional gas chromatography-quadrupole time-of-flight mass spectrometry(GC × GC-QTOF MS) combined with headspace solid phase microextraction(HS-SPME).Influences of different SPME fibers(PDMS,DVB/PDMS and DVB/C-WR/PDMS),extraction temperatures(50,70,90,110,130,150 ℃),headspace equilibrium times(15,30,60 min),modulation periods(2,4,6 s) and heating rates of oven(3,5,8,10 ℃/min) on the determination effect were compared.The VOCs were identified with NIST library combined with Kovats indexes.The content of high-frequency compounds was determined by semi-quantification.The best HS-SPME and instrument conditions were as follows:SPME fiber:80 μm DVB/C-WR/PDMS,extraction temperature:110 ℃,equilibrium time:30 min,modulation period:4 s,and heating rate of oven:8 ℃/min. 209 volatile organic compounds were determined in 9 rPET samples,including aromatic compounds,alkanes,alcohols,aldehydes,ketones,esters,olefins,naphthalene,carboxylic acids and phenols.Aromatic compounds could be derived from the degradation of rPET in different environments.Terpene may come from the residue of flavor substances in early PET bottle drinks.Among the 9 rPET samples,the substances with detection frequency greater than 5 were d-limonene,,γ,-terpinene,5-methyl-1-undecene,tetradecane,naphthalene,1-methyl-naphthalene,1-ethylidene-1h-indene,2-dodecanol,2-decanone and 2,4-di-tert-butylphenol.,D,-Limonene is a common pollutant in rPET,which comes from the contact between original PET bottle and beverage.2,4-di-tert-butylphenol may be the degradation product of antioxidant 168,and remaining in rPET.The highest content of high-frequency compounds was 2.13 mg/kg(tetradecane).No misused compound with extremely high concentration was found.This research provided not only a scientific and reliable methodological basis for the investigation of VOCs in rPET,but also the basic data for utilization and safety assessment of rPET.
关键词
回收PET全二维气相色谱-串联四极杆飞行时间高分辨质谱挥发性有机物方法优化
Keywords
recycled polyethylene terephthalate(rPET)comprehensive two-dimensional gas chromatography-quadrupole time of flight mass spectrometryvolatile organic compoundsmethod optimization
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