Laborda Francisco, Trujillo Celia, Lobinski Ryszard
Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain.
Group of Analytical Spectroscopy and Sensors (GEAS), Institute of Environmental Sciences (IUCA), University of Zaragoza, Pedro Cerbuna 12, 50009, Zaragoza, Spain.
Talanta. 2021 Jan 1;221:121486. doi: 10.1016/j.talanta.2020.121486. Epub 2020 Sep 14.
Single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) has become a well-established technique for the detection, size characterization and quantification of inorganic nanoparticles but its use for the analysis of micro- and nanoparticles composed of carbon has been scarce. Here, the analysis of a microplastic suspensions by ICP-MS operated in single particle mode using microsecond dwell times is comprehensively discussed. The detection of polystyrene microparticles down to 1.2 μm was achieved by monitoring the C isotope. Plastic microparticles of up to 5 μm were completely volatized and their components atomized, which allowed the detection of microplastics, their quantification using aqueous dissolved carbon standards, and the measurement of the size-distribution of the detected particles. Limits of detection of 100 particles per milliliter were achieved for an acquisition time of 5 min. The method developed was applied to the screening of microplastics in personal care products and released from food packagings. The chemical identity of the detected microplastics was confirmed by attenuated total reflectance Fourier-transform infrared spectroscopy.
单颗粒电感耦合等离子体质谱法（SP-ICP-MS）已成为一种成熟的技术，用于检测、表征无机纳米颗粒的尺寸和定量分析，但其在分析由碳组成的微米和纳米颗粒方面的应用却很少。本文全面讨论了使用微秒级驻留时间的单颗粒模式ICP-MS对微塑料悬浮液的分析。通过监测碳同位素实现了对低至1.2μm的聚苯乙烯微颗粒的检测。高达5μm的塑料微颗粒完全挥发，其成分被雾化，这使得能够检测微塑料，使用水溶碳标准进行定量分析，并测量检测到的颗粒的尺寸分布。在5分钟的采集时间内，检测限达到每毫升100个颗粒。所开发的方法应用于个人护理产品和食品包装中释放的微塑料的筛选。通过衰减全反射傅里叶变换红外光谱法确认了检测到的微塑料的化学特性。
