Application of Single-Particle ICP-MS to Determine the Mass Distribution and Number Concentrations of Environmental Nanoparticles and Colloids,Environmental Science & Technology Letters

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Application of Single-Particle ICP-MS to Determine the Mass Distribution and Number Concentrations of Environmental Nanoparticles and Colloids
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2021-05-28 , DOI: 10.1021/acs.estlett.1c00314
Muammar Mansor ₁ , Sören Drabesch ₁ , Timm Bayer ₁ , Anh Van Le ₁ , Ankita Chauhan ₁ , Johanna Schmidtmann ₂ , Stefan Peiffer ₂ , Andreas Kappler ₁

Affiliation

Analyzing the elemental compositions and size distributions of nanoparticles, colloids, and their aggregates in environmental samples represents a key task in understanding contaminant, substrate, and nutrient cycling. Single-particle ICP-MS (spICP-MS) is a high-throughput method that is capable of providing the elemental mass of thousands of particles within minutes. The challenge, however, lies in data analysis and interpretation, especially for complex environmental samples. Here we present successful applications of spICP-MS for environmental samples. We first analyzed the homoaggregation behavior of synthetic microplastic and magnetite (abiogenic and biogenic) nanoparticles. The measured distribution of aggregate mass was described as a function of the number of primary particles/aggregate (N_pp). In tandem with dynamic light scattering data, differences in aggregates’ compactness (primary particles per nanometer) between samples can be determined. Second, we showed how sequential elemental analysis allows evaluation of the mobility of a toxic arsenic metalloid and its inferred association with colloidal Fe(III) (oxyhydr)oxides. Finally, we investigated the composition of heterogeneous iron–carbon-rich colloidal flocs, highlighting distinct colloidal Fe and C distributions and C/Fe ratios between samples from different permafrost thawing stages. On the basis of our results, we provide guidelines for successful sample preparation and promising future spICP-MS opportunities and applications with environmental samples.

中文翻译：

应用单粒子 ICP-MS 测定环境纳米粒子和胶体的质量分布和数量浓度

分析环境样品中纳米颗粒、胶体及其聚集体的元素组成和尺寸分布是了解污染物、基质和营养循环的关键任务。单粒子 ICP-MS (spICP-MS) 是一种高通量方法，能够在几分钟内提供数千个粒子的元素质量。然而，挑战在于数据分析和解释，尤其是对于复杂的环境样本。在这里，我们展示了 spICP-MS 在环境样品中的成功应用。我们首先分析了合成微塑料和磁铁矿（非生物和生物）纳米粒子的均聚行为。测量的聚集体质量分布被描述为初级粒子/聚集体数量的函数 ( N _pp）。结合动态光散射数据，可以确定样品之间聚集体紧密度（每纳米初级粒子数）的差异。其次，我们展示了连续元素分析如何评估有毒砷准金属的迁移率及其与胶体 Fe(III)（羟基）氧化物的推断关联。最后，我们研究了非均质富铁碳胶体絮体的组成，突出了不同永久冻土融化阶段样品之间不同的胶体 Fe 和 C 分布以及 C/Fe 比。根据我们的结果，我们为成功的样品制备和有希望的未来 spICP-MS 机会和环境样品应用提供了指导。

更新日期：2021-07-13

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