<br>中空纤维流场流分级结合 ICP-MS/MS 原位表征银纳米颗粒在水溶液中的硫化过程,Talanta

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中空纤维流场流分级结合 ICP-MS/MS 原位表征银纳米颗粒在水溶液中的硫化过程
Talanta ( IF 5.6 ) Pub Date : 2024-02-01 , DOI: 10.1016/j.talanta.2024.125738
Qingsheng Bai ₁ , Qingcun Li ₂ , Zhiqiang Tan ₂ , Jingfu Liu ₂

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硫化被认为是银纳米粒子（AgNPs）最重要的环境转化过程之一，影响其运输、吸收和毒性。在此，基于中空纤维流场流分级与三重四极杆电感耦合等离子体质谱仪 (HF5-ICP-MS/MS)，我们开发了一种有效的方法来准确表征水溶液中纳米银的硫化过程。 HF5 可以有效去除干扰离子并在线分离不同尺寸的纳米颗粒，ICP-MS/MS 通过质量转移模式监测 SO 可以准确检测 S 元素。通过所提出的方法，选择两种AgNPs，即柠檬酸盐包覆的AgNPs和PVP包覆的AgNPs作为模型来追踪它们在硫化过程中的转移行为。结果表明，一旦 AgNPs 暴露于 NaS 溶液，HF5-ICP-MS/MS 即可快速检测到 SO 和 Ag 的重叠分形图，表明 Ag 和 S 共存，从而证实 AgS 和 AgNPs 的产生经历了快速的过程。硫化过程。在所检测的条件下，两种包覆剂对颗粒稳定性的影响存在显着差异。在硫化物存在下，PVP 包覆的 AgNPs 可以保持初始尺寸分布并具有更高的稳定性，而柠檬酸盐包覆的 AgNPs 的尺寸分布变化很大。开发的 HF5-ICP-MS/MS 方法为识别和表征水性溶液中 AgNP 的转化过程提供了可靠的工具，有助于更深入地了解不同涂层下 AgNP 的环境归趋和行为。

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In situ characterization of silver nanoparticles sulfidation processes in aquatic solution by hollow fiber flow-field flow fractionation coupled with ICP-QQQ

The sulfidation is considered as one of the most important environmental transformation processes of silver nanoparticles (AgNPs), which affects their transport, uptake and toxicity. Herein, based on the hollow fiber flow-field flow fractionation coupled with triple quadrupole inductively coupled plasma mass spectrometry (HF5-ICP-QQQ), we developed an efficient approach to accurately characterize the sulfidation process of AgNPs in aquatic solutions. HF5 could efficiently remove interferential ions and separate nanoparticles with different sizes online, and ICP-QQQ could accurately detect S element through monitoring SO in mass shift mode. By the proposed method, two kinds of AgNPs, citrate-coated AgNPs and PVP-coated AgNPs, were selected as models to trace their transfer behaviors during the sulfidation. The results showed once AgNPs were exposed to NaS solution, the overlapping fractograms of SO and Ag were rapidly detected by HF5-ICP-QQQ to indicate the co-presence of Ag and S, and thus confirming the production of AgS and AgNPs underwent a rapid sulfidation process. There were substantial differences in the influence of the two coated agents on the stability of the particles under the conditions examined. In the presence of sulfide, PVP-coated AgNPs could maintain initial size distribution with higher stability, while the size distribution of citrate-coated AgNPs changed considerably. The developed HF5-ICP-QQQ method provides a reliable tool to identify and characterize the transformation process of AgNPs in aquatic solution, which contributed to a deeper understanding of the environmental fate and behavior of AgNPs with different coating.

更新日期：2024-02-01

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