Microplastics pollution is becoming one of the most serious threats to the surface ecosystem of the earth; it is widespread in oceans, rivers, sediments, soils, and organisms. It is a growing concern as an environmental pollutant, which currently has no clear detection standard. Detection methods still need to be constantly supplemented and improved. This study explored a novel method called time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) in this field. Four types of microplastics in farmland soils, namely, polypropylene, polyvinyl chloride, polyethylene terephthalate, and polyamide 6, were successfully identified in terms of particle size and abundance by combining the high molecular specificity with ion imaging capability of ToF‐SIMS. The procedure based on ToF‐SIMS analysis also provides a methodological reference and basic data for the investigation and research of microplastics in soil, coastal beaches, and sediment.

中文翻译：

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土壤中微塑料的ToF‐SIMS表征

微塑料污染正成为对地球表面生态系统的最严重威胁之一。它广泛存在于海洋，河流，沉积物，土壤和生物中。作为一种环境污染物，它的关注日益增长，目前尚无明确的检测标准。检测方法仍然需要不断补充和改进。这项研究探索了一种称为飞行时间二次离子质谱（ToF-SIMS）的新方法。通过结合ToF-SIMS的高分子特异性和离子成像功能，成功地鉴定了农田土壤中的四种类型的微塑料，分别是聚丙烯，聚氯乙烯，聚对苯二甲酸乙二酯和聚酰胺6。