College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
Zhoushan Institute of Calibration and Testing for Quality and Technical Supervision, Zhoushan 316021, China.
Mar Pollut Bull. 2019 Aug;145:153-160. doi: 10.1016/j.marpolbul.2019.05.037. Epub 2019 May 24.
As a global pollutant, microplastics have attracted attention from the public and researchers. However, the lack of standard and time-saving methods for analysis has become one of the bottlenecks in microplastics research. Here, we demonstrate TGA coupled to FTIR to identify and quantify certain microplastics in environment. Samples were pyrolyzed in TGA and the pyrolysis gases were analyzed by FTIR. Combining TGA and FTIR data adds discriminatory power as temperature profiles and absorption spectra differ among several common plastics. To quantify on a mass basis, we calibrated on characteristic IR peaks at temperatures of maximum weight loss for individual polymers. The method can distinguish PVC, PS and was validated by spiking samples with known quantities of microplastics. The result of field sample experiments showed that TGA-FTIR can be used to identify and quantify PVC and PS in bivalves, seawater and soil. And the method may be applicable to environmental samples.
作为一种全球性的污染物，微塑料已经引起了公众和研究人员的关注。然而，缺乏标准和节省时间的分析方法已经成为微塑料研究的瓶颈之一。在这里，我们展示了 TGA 与 FTIR 的联用，以识别和定量环境中的某些微塑料。样品在 TGA 中进行热解，热解气体通过 FTIR 进行分析。TGA 和 FTIR 数据的结合增加了辨别力，因为几种常见塑料的温度曲线和吸收光谱不同。为了进行质量定量，我们在单个聚合物最大失重温度处的特征 IR 峰上进行了校准。该方法可以区分 PVC、PS，并通过用已知数量的微塑料对样品进行加标验证。现场样品实验的结果表明，TGA-FTIR 可用于识别和定量双壳类动物、海水和土壤中的 PVC 和 PS。并且该方法可能适用于环境样品。
