University of Alicante, Department of Analytical Chemistry, Nutrition and Food Sciences, PO Box 99, 03080, Alicante, Spain.
University of Alicante, Department of Analytical Chemistry, Nutrition and Food Sciences, PO Box 99, 03080, Alicante, Spain.
Talanta. 2023 Jan 15;252:123818. doi: 10.1016/j.talanta.2022.123818. Epub 2022 Aug 11.
Single particle inductively coupled plasma mass spectrometry (spICP-MS) has been explored for the determination of metallic nanoparticles (NPs) in air. Different extraction strategies (i.e., direct immersion, hard cap espresso, ultrasound-assisted and microwave-assisted extraction) and extracting solvents (i.e., citric acid, trisodium citrate, potassium nitrate, sodium nitrate, thiourea, disodium pyrophosphate and ammonium hydroxide) were investigated for platinum and gold NPs recovery from glass and microquartz fiber filters with a nominal size cut-off of 300 nm. Results show that metallic NPs are preserved and quantitatively extracted from the filter in 4 min inside an 800 W microwave oven by using 40 mL of a 2.0% w w NHOH solution. For the remaining extraction procedures, either incomplete recoveries or NPs degradation occur. As regards the influence of filter material, microquartz fiber affords better NPs capturing performance than glass fiber ones, enabling the quantification of NPs with diameters above 28 nm. This methodology has been successfully applied to determine PtNPs in filters from environmental monitoring stations and to gain insight into NPs transport through ICP-MS sample introduction system. Care should be taken during spICP-MS calibration since biased results might be obtained due to differences on NPs transport efficiency between standards and samples.
单颗粒电感耦合等离子体质谱（spICP-MS）已被用于空气中金属纳米颗粒（NPs）的测定。不同的提取策略（即直接浸入、硬帽浓咖啡提取、超声辅助提取和微波辅助提取）和提取溶剂（即柠檬酸、柠檬酸三钠、硝酸钾、硝酸钠、硫脲、焦磷酸二氢二钠和氨水）被用于从玻璃和微石英纤维过滤器中回收铂和金 NPs，这些过滤器的名义截止尺寸为 300nm。结果表明，在 800W 微波炉中，使用 40ml2.0%w/wNHOH 溶液，可在 4 分钟内将金属 NPs 保存在过滤器中并从过滤器中定量提取出来。对于其余的提取程序，要么回收率不完全，要么 NPs 降解。至于过滤器材料的影响，微石英纤维比玻璃纤维具有更好的 NPs 捕获性能，能够定量测定直径大于 28nm 的 NPs。该方法已成功应用于从环境监测站的过滤器中测定 PtNPs，并深入了解 NPs 通过 ICP-MS 样品导入系统的传输情况。在 spICP-MS 校准过程中应小心，因为由于标准品和样品之间的 NPs 传输效率存在差异，可能会得到有偏差的结果。
