MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA.
Environ Pollut. 2023 Oct 1;334:122178. doi: 10.1016/j.envpol.2023.122178. Epub 2023 Jul 11.
Microplastic (MP) pollution is widely distributed in the environment. However, methods for source apportionment of MPs are still lacking. In this study, the shape and size of 102,860 MPs in indoor dust from 39 cities of China were analyzed by laser direct infrared, and accordingly, a shape index (f) based on MP's aspect ratio was developed to assess the contribution of textiles release. In addition, a composition index (f) based on the ratio of the mass concentration of polyethylene terephthalate (PET) to polyamide (PA), which were detected by liquid chromatography-tandem mass spectrometry, was proposed. The contribution of textile source and non-textile source to the indoor MPs were also estimated based on f. It is estimated by f that 43% of MPs in indoor dust was released from textiles. Among the most abundant MPs in indoor dust, 98% of polyurethane, 94% of PA and 92% of PET come from the textile source, 76% of polypropylene and almost all of polyethylene come from the non-textile source. f indicates that 83% of PET MPs comes from textile source, i.e., polyester. Considering the application proportion of PET in textile and non-textile industry, it is estimated that 59% of MPs in indoor dust comes from textile source, which is similar to the result obtained by f.
微塑料（MP）污染广泛分布于环境中，但针对其污染源解析的方法仍较为缺乏。本研究采用激光直接红外法对中国 39 个城市室内灰尘中 102860 个 MP 的形状和尺寸进行了分析，并据此开发了一种基于 MP 纵横比的形状指数（f），以评估纺织品释放的贡献。此外，还提出了一种基于液相色谱-串联质谱法检测到的聚对苯二甲酸乙二醇酯（PET）和聚酰胺（PA）质量浓度比的组成指数（f）。基于 f 还估算了纺织品源和非纺织品源对室内 MPs 的贡献。根据 f 的估算，室内灰尘中 43%的 MPs 是由纺织品释放的。在室内灰尘中最丰富的 MPs 中，98%的聚氨酯、94%的 PA 和 92%的 PET 来自纺织品源，76%的聚丙烯和几乎所有的聚乙烯来自非纺织品源。f 表明，83%的 PET MPs 来自纺织品源，即聚酯。考虑到 PET 在纺织和非纺织行业中的应用比例，估计室内灰尘中 59%的 MPs 来自纺织品源，这与 f 的结果相似。
