乌鲁木齐南部大气及降尘中微塑料的形貌特征

采用体视显微镜、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和能量色散光谱（EDS）等对乌鲁木齐南部大气总悬浮颗粒物（TSP）及降尘样品中微塑料的颜色、成分及形貌等特征进行分析.结果表明，TSP和降尘中存在纤维、碎片和薄膜等多种形状的微塑料，且TSP和降尘中的微塑料分别以纤维状（81.8%和86.2%）和碎片状（56.3%~68.4%）为主；通过FTIR鉴定出TSP和降尘中的塑料成分主要是聚乙烯，聚丙烯和聚苯乙烯；SEM发现纤维状微塑料表面较为光滑，有少量的裂痕，上面分布少量碎屑；碎片状微塑料边缘卷曲破碎，形状不规则，破损程度高，表面黏附大量的颗粒物；EDS分析表明微塑料中以C和O元素为主，还包含Si、Na、Zn等元素.结果可为进一步了解乌鲁木齐大气微塑料的污染情况提供基础数据支撑.

Morphological characteristics of microplastics in the atmosphere and dustfall in southern Urumqi

In this paper, the color, composition and morphology of microplastics in atmospheric total suspended particulate matter (TSP) and dustfall samples from southern Urumqi were analyzed by using stereomicroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that microplastics of various shapes such as fibers, fragments and films were present in TSP and dustfall, and the fibrous (81.8% and 86.2%) and fragmented (56.3%~68.4%) microplastics were predominant in TSP and dustfall, respectively. The plastic components in TSP and dustfall were identified by FTIR to be mainly polyethylene, polypropylene and polystyrene. SEM found that the surface of fibrous microplastics was smooth, with a few cracks and a small amount of debris distributed on it. The fragmented microplastics were curled and broken at the edges, with irregular shape and high degree of breakage, and a large amount of particles adhered to the surface. EDS analysis showed that the microplastics were dominated by C and O elements, and also contained Si, Na and Zn. The results can provide basic data support for further understanding of the atmospheric microplastic pollution in Urumqi.