基于热重红外联用技术的微塑料定量分析方法优化  

Optimization of Quantification for Microplastics by Thermal Gravimetric Analysis Coupled with Fourier Transform Infrared Spectroscopy

作　　者：张杰 侯静文 李妍 刘永佳 ZHANG Jie;HOU Jingwen;LI Yan;LIU Yongjia(Instrumental Analysis Center,Shanghai Jiao Tong University,Shanghai 200240,China;School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学,分析测试中心,上海200240 [2]上海交通大学,化学化工学院,上海200240

出　　处：《塑料》2025年第1期144-148,共5页Plastics

摘　　要：热重红外联用技术(TGA-FTIR)已经应用于多种微塑料的定量分析,但是,该方法仅能检测有特征吸收峰的微塑料,对无特征吸收峰的微塑料难以进行定量分析。采用聚苯乙烯(PS)、聚丙烯(PP)和聚乙烯(PE)3种相似结构微塑料作为研究对象,优化TGA-FTIR技术定量分析微塑料的方法。通过对比3种微塑料的红外二阶导数谱图,773 cm^(-1)处为PS特征吸收峰,2946 cm^(-1)处为PP及PE的特征吸收峰。由于PP和PE的红外特征吸收峰重叠,采用高斯函数对2946 cm^(-1)处的谱峰进行分离,将二者进行区分。根据朗伯-比尔定律原理,建立3种微塑料质量和特征吸收峰峰面积之间的相关性。结果表明,3种微塑料的质量在0.5~6.0 mg范围内,与红外特征峰峰面积呈线性关系,线性相关系数大于0.99。Although the thermogravimetry coupled to infrared(TGA-FTIR)had been applied to the quantitative analysis of a variety of microplastics,this method could only detect the microplastics with infrared absorption characteristic peak,and it was difficult to quantify the microplastics without characteristic peaks.Three microplastics with similar structures including polystyrene(PS),polypropylene(PP)and polyethylene(PE),were selected to optimize the quantitative analysis method of microplastics by TGA-FTIR.By comparing the second derivative spectra,773 cm^(-1)was selected as the characteristic absorption peak of PS,and 2946 cm^(-1)as the characteristic absorption peak of PP and PE.The absorption peaks at 2946 cm^(-1)were superimposed by the pyrolysis products of PP and PE,and Gaussian function was used to separate the spectral peaks at 2946 cm^(-1).According to Lambert-Beer law,the correlation between the mass of three kinds of microplastics and the characteristic absorption peak area was established.The characteristic absorption peak area showed a strong correlation with mass(R2>0.99)in the range of 0.5~6.0 mg.

关 键 词：微塑料 热重红外联用 定量分析 分峰拟合 方法优化 

分 类 号：TQ325[化学工程—合成树脂塑料工业]