Dissolved metal ion removal by online hollow fiber ultrafiltration for enhanced size characterization of metal-containing nanoparticles with single-particle ICP-MS

作     者：Haowen Jiang YingWang Zhiqiang Tan Ligang Hu Jianbo Shi Guangliang Liu Yongguang Yin Yong Cai Guibin Jiang Haowen Jiang;Ying Wang;Zhiqiang Tan;Ligang Hu;Jianbo Shi;Guangliang Liu;Yongguang Yin;Yong Cai;Guibin Jiang

作者机构：Laboratory of Environmental Nanotechnology and Health EffectResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Laboratory of Environmental Chemistry and EcotoxicologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of SciencesBeijing 100049China Department of Chemistry and BiochemistryFlorida International UniversityMiami 33199USA School of EnvironmentHangzhou Institute for Advanced StudyUCASHangzhou 310024China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2023年第126卷第4期

页      面：494-505页

核心收录：

学科分类：07[理学] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0713[理学-生态学] 0702[理学-物理学] 

基　　金：supported by the National Key Research and Development Project (No.2020YFA0907400) Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDPB2005) National Natural Science Foundation of China(No.21777178) the National Young Top-Notch Talents (No.W03070030) Youth Innovation Promotion Association of the Chinese Academy of Sciences (No.Y202011)。 

主　　题：Hollow fiber ultrafiltration(HFUF) Single particle-inductively coupled plasma mass spectrometry (SP-ICP-MS) Removal of ions Particle size characterization 

摘      要：Single particle-inductively coupled plasma mass spectrometry (SP-ICP-MS) is a powerful tool for size-characterization of metal-containing nanoparticles (MCNs) at environmentally relevant concentrations,however,coexisting dissolved metal ions greatly interfere with the accuracy of particle size analysis.The purpose of this study is to develop an online technique that couples hollow fiber ultrafiltration (HFUF) with SP-ICP-MS to improve the accuracy and size detection limit of MCNs by removing metal ions from suspensions of MCNs.Through systematic optimization of conditions including the type and concentration of surfactant and complexing agent,carrier pH,and ion cleaning time,HFUF completely removes metal ions but retains the MCNs in suspension.The optimal conditions include using a mixture of 0.05 vol.%FL-70 and 0.5 mmol/L Na2S2O_(3)(pH=8.0) as the carrier and 4 min as the ion cleaning time.At these conditions,HFUF-SP-ICP-MS accurately determines the sizes of MCNs,and the results agree with the size distribution determined by transmission electron microscopy,even when metal ions also are present in the sample.In addition,reducing the ionic background through HFUF also lowers the particle size detection limit with SP-ICP-MS (e.g.,from 28.3 to 14.2 nm for gold nanoparticles).This size-based ion-removal principle provided by HFUF is suitable for both cations (e.g.,Ag+) and anions (e.g.,AuCl_(4)^(-)) and thus has good versatility compared to ion exchange purification and promising prospects for the removal of salts and macromolecules before single particle analysis.