热重分析/红外光谱-气相色谱-质谱联用技术测定松针中6种常见微塑料  

Determination of Six Microplastics in Pine Needles by TGA/FTIR-GC-MS

作　　者：韩卓 刘禹慧 魏晓菲 李彭辉[2] 宋善军 HAN Zhuo;LIU Yu-hui;WEI Xiao-fei;LI Peng-hui;SONG Shan-jun(National Institute of Metrology,Beijing 100029,China;College of Environmental Science and Safety Engineering,Tianjin University of Technology,Tianjin 300382,China)

机构地区：[1]中国计量科学研究院,北京100029 [2]天津理工大学环境科学与安全工程学院,天津300382

出　　处：《分析测试学报》2024年第8期1249-1256,共8页Journal of Instrumental Analysis

基　　金：国家重点研发计划项目(2023YFF0614203)。

摘　　要：该研究基于热重分析/红外光谱-气相色谱-质谱(TGA/FTIR-GC-MS)联用技术建立了可用于聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PS)、聚氯乙烯(PVC)、聚对苯二甲酸乙二酯(PET)、聚碳酸酯(PC)6种常见微塑料的定性定量检测方法。方法检出限为0.03~1.11μg,相对标准偏差为4.0%~12%(n=3),加标回收率为80.4%~93.3%。应用所建立的方法对来自武夷山、青海湖、大兴安岭等12个采样点的松针样品进行分析,得到6种微塑料的浓度范围为0.01~3.15μg·mg^(-1)。此外,样品中6种塑料均有检出,检出率依次为PE、PP和PS(100%)、PET(92%)、PC(60%)、PVC(8%)。该方法可为我国微塑料环境污染评估及环境行为研究提供技术支持。Microplastics,as an emerging pollutant that received increasing attention,have been confirmed to exist widely around the world and pose risks to both environment and human health.The various characteristics of microplastics lead to diverse analytical techniques,which has limited the consistent comparability of data between different studies.With the application of mass spectrometer in microplasitcs analysis,the mass concentration showed advantages in the comparability of different research data and has been used for the evaluation of occurrence level in different environmental ma⁃trices.In this study,a qualitative and quantitative analysis method for polyethylene(PE),polypro⁃pylene(PP),polystyrene(PS),polyvinyl chloride(PVC),polyethylene terephthalate(PET),and polycarbonate(PC)microplastics was developed based on the thermogravimetric analysis/infrared spectroscopy-gas chromatography-mass spectrometer(TGA/FTIR-GC-MS).TGA monitors the ther⁃mal stability and volatile compounds of materials by recording mass loss as a function of temperature or time.FTIR could provide functional information of chemical structure.GC-MS could identify and quantify the pyrolysis products.As a comprehensive instrument platform,TGA/FTIR-GC-MS can achieve triple analysis of microplastics combing thermal decomposition kinetic information,spectral information and mass spectrum information.After detailed method optimization,the detection limits of the quantitative analysis method(LODs)were 0.03-1.11μg.The recoveries were 80.4%-93.3%and the relative standard deviations(RSDs)obtained from spiked experiments were 4.0%-12%(n=3)for all six plastics.To further evaluate the method performances,pine needles,which are good pas⁃sive biological sampler for monitoring organic pollutants,were analyzed as field sample matrices.A total of 12 pine needle samples were collected from different areas in China,such as Wuyi Mountain,Qinghai Lake,Yangshuo,Guangxi,and Greater Hinggan Mountains.All samples were carefully washed to remove interferes during

关 键 词：热重分析/红外光谱-气相色谱-质谱(TGA/FTIR-GC-MS)联用技术 微塑料 松针 定量分析 

分 类 号：O657.3[理学—分析化学] O657.7[理学—化学]