Abstract：
The contamination of freshwater with microplastics (MPs) has been established globally. While the analysis of MPs has predominantly involved spectroscopic methods for revealing particle numbers, the potential of employing spectroscopy for mass estimation has been underutilized. Consequently, there is a need to enhance our understanding of the mass loads of MPs and ensure the complementarity and comparability of various techniques for accurate quantification. This study presents the first comparative results on urban water samples using micro Fourier-transform infrared (μ-FTIR) imaging and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) to identify and quantify MPs in both particle numbers and mass concentration. Two sampling campaigns in summer and winter were conducted at 11 locations within the Amsterdam canal network. An advanced in-situ volume-reducing sampling pump was employed to collect MPs from the surface water within the size fraction of 10-300 μm. The analysis revealed MP concentrations within the range of 16-107 MP/m3, estimated to be 2.0-789 μg/m3 by μ-FTIR imaging and 8.5-754 μg/m3 by Py-GC-MS. The results of the two analysis techniques showed good comparability in terms of the general trends of MP abundances, with variations in polymer compositions due to the inherent inter-methodological differences. Elevated MP concentrations were observed in the city center compared to the suburban areas. In addition, seasonal differences in MP abundances were noted at the locations with high human activity.
摘要：
微塑料（MPs）污染淡水已在全球范围内确立。虽然MPs的分析主要涉及光谱方法来揭示粒子数，使用光谱学进行质量估计的潜力尚未得到充分利用。因此,有必要加强我们对国会议员质量负荷的理解，并确保各种技术的互补性和可比性，以实现准确的量化。这项研究提出了城市水样的第一个比较结果，使用显微傅里叶变换红外（μ-FTIR）成像和热解-气相色谱-质谱（Py-GC-MS）来识别和量化颗粒数量和质量浓度的MPs。夏季和冬季在阿姆斯特丹运河网络内的11个地点进行了两次采样活动。采用先进的原位减少体积的采样泵从10-300μm的尺寸范围内的地表水中收集MP。分析显示MP浓度在16-107MP/m3范围内，通过μ-FTIR成像估计为2.0-789μg/m3，通过Py-GC-MS估计为8.5-754μg/m3。两种分析技术的结果在MP丰度的总体趋势方面显示出良好的可比性，由于固有的方法间差异，聚合物组成发生变化。与郊区相比，市中心的MP浓度升高。此外,在人类活动较高的地区，发现了MP丰度的季节性差异。
