title: Speciation Analysis of Labile and Total Silver(I) in Nanosilver Dispersions and Environmental Waters by Hollow Fiber Supported Liquid Membrane Extraction.
abstract: 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-Na2HPO4 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 ± 0.25)% and 0.1 μg/L for labile Ag(I), and (82.3 ± 2.0)% and 0.5 μg/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 74.0-98.1%. 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.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.|Chemical Metrology and Analytical Science Division, National Institute of Metrology , P. R. China , Beijing 100029.
authors.forename: Jing-Bo
authors.initials: JB
authors.lastname: Chao
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.
authors.forename: Xiao-Xia
authors.initials: XX
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.
authors.forename: Mo-Hai
authors.initials: MH
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: Tan
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.
authors.forename: Su-Juan
authors.initials: SJ
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.
authors.forename: Xiao-Wei
authors.initials: XW
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences , Beijing 100085, China.|Institute of Environment and Health, Jianghan University , Hubei Province, Wuhan 430056, China.
authors.forename: Jing-Fu
authors.initials: JF
authors.lastname: Liu
mesh_terms: D002681:China; D057230:Limit of Detection; D059625:Liquid-Liquid Extraction / Q000295:instrumentation / Q000379:methods*; D013058:Mass Spectrometry / Q000379:methods; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000032:analysis* / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000737:chemistry; D010316:Particle Size; D012834:Silver / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008567:Membranes, Artificial; D009943:Organophosphorus Compounds; D014874:Water Pollutants, Chemical; D012834:Silver; C044965:trioctyl phosphine oxide