Microplastics (MPs) have frequently been found in the environment. However, studies of the quantification methods for MPs are still needed. Plastics are polymers with different degrees of polymerization. In this study, alkali-assisted thermal hydrolysis was applied to depolymerize two plastics containing ester groups, polycarbonate (PC) and polyethylene terephthalate (PET), in a pentanol or butanol system. By determining the concentrations of the depolymerized building block compounds, i.e., bisphenol A and p-phthalic acid, we quantified the amounts of PC and PET MPs in environmental samples. Recoveries of 87.2–97.1% were obtained for the PC and PET plastic particles spiked in the landfill sludge. The method was successfully applied to determine the occurrence of PC and PET MPs in samples of sludge, marine sediments, indoor dust, digestive residues in mussel and clam, and sea salt and rock salt. High concentrations of 246 and 430 mg/kg were determined for PC and PET type MPs, respectively, in an indoor dust. In addition, concentrations of 63.7 mg/kg for PC and 127 mg/kg for PET were detected in the digestive residues of a clam.

中文翻译：

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液相色谱-串联质谱定量环境样品中聚碳酸酯和聚对苯二甲酸乙二醇酯微塑料的简单方法

在环境中经常发现微塑料（MPs）。但是，仍然需要研究MP的定量方法。塑料是具有不同聚合度的聚合物。在这项研究中，在戊醇或丁醇体系中，采用碱辅助热水解法将含有酯基的两种塑料聚碳酸酯（PC）和聚对苯二甲酸乙二醇酯（PET）解聚。通过确定解聚的砌块化合物（即双酚A和p）的浓度-邻苯二甲酸，我们量化了环境样品中PC和PET MP的量。掺入垃圾填埋污泥中的PC和PET塑料颗粒的回收率为87.2–97.1％。该方法已成功用于测定污泥，海洋沉积物，室内粉尘，贻贝和蛤类中的消化残余物以及海盐和岩盐样品中PC和PET MP的存在。在室内粉尘中，PC和PET型MP的高浓度分别为246和430 mg / kg。此外，在蛤的消化残余物中检测到PC的浓度为63.7 mg / kg，PET的浓度为127 mg / kg。