Speciation Analysis of Labile and Total Silver(I) in Nanosilver Dispersions and Environmental Waters by Hollow Fiber Supported Liquid Membrane Extraction

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• 作者：Jing-Bo Chao ; Xiao-Xia Zhou ; Mo-Hai Shen ; Zhi-Qiang Tan ; Rui Liu ; Su-Juan Yu ; Xiao-Wei Wang ; Jing-Fu Liu
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：December 15, 2015
• 年：2015
• 卷：49
• 期：24
• 页码：14213-14220
• 全文大小：408K
• ISSN：1520-5851

文摘

Hollow fiber supported liquid membrane (HFSLM) extraction was coupled with ICP-MS for speciation analysis of labile Ag(I) and total Ag(I) in dispersions of silver nanoparticles (AgNPs) and environmental waters. Ag(I) in aqueous samples was extracted into the HFSLM of 5%(m/v) tri-n-octylphosphine oxide in n-undecane, and stripped in the acceptor of 10 mM Na₂S₂O₃ and 1 mM Cu(NO₃)₂ prepared in 5 mM NaH₂PO₄鈥揘a₂HPO₄ buffer (pH 7.5). Negligible depletion and exhaustive extraction were conducted under static and 250 rpm shaking to extract the labile Ag(I) and total Ag(I), respectively. The extraction equilibration was reached in 8 h for both extraction modes. The extraction efficiency and detection limit were (2.97 卤 0.25)% and 0.1 渭g/L for labile Ag(I), and (82.3 卤 2.0)% and 0.5 渭g/L for total Ag(I) detection, respectively. The proposed method was applied to determine labile Ag(I) and total Ag(I) in different sized AgNP dispersions and real environmental waters, with spiked recoveries of total Ag(I) in the range of 74.0鈥?8.1%. With the capability of distinguishing labile and total Ag(I), our method offers a new approach for evaluating the bioavailability and understanding the fate and toxicity of AgNPs in aquatic systems.