title: Magnetic solid phase extraction coupled with inductively coupled plasma mass spectrometry for the speciation of mercury in environmental water and human hair samples.
abstract: In this work, γ-mercaptopropyltrimethoxysilane (γ-MPTS) modified Fe3O4@SiO2 magnetic nanoparticles (MNPs) was successfully prepared, and characterized by Fourier transform infrared spectrometer (FT-IR), Transmission electron microscope (TEM) and Vibrating sample magnetometer (VSM). The sorption performance of the prepared Fe3O4@SiO2@γ-MPTS MNPs towards methylmercury (CH3Hg(+)) and inorganic mercury (Hg(2+)) was investigated. It was found that CH3Hg(+) and Hg(2+) could be simultaneously retained on the prepared Fe3O4@SiO2@γ-MPTS MNPs, and the quantitative elution of CH3Hg(+) and total mercury (THg) was achieved by using 1.5 mol L(-1) HCl containing 0.01% and 3% thiourea (m/v), respectively. And the levels of Hg(2+) were obtained by subtracting CH3Hg(+) from THg. Based on the above facts, a method of magnetic solid phase extraction (MSPE) combined with inductively coupled plasma mass spectrometry (ICP-MS) was developed for the speciation of CH3Hg(+) and Hg(2+). Various experimental parameters affecting MSPE of CH3Hg(+) and Hg(2+) such as pH, eluent, sample volume, and co-existing ions have been studied. Under the optimized conditions, the limits of detection (LODs) for CH3Hg(+) and THg were 1.6 and 1.9 ng L(-1), respectively. The accuracy of the proposed method was validated by analysis of a Certified Reference Material NRCC DORM-2 dogfish muscle, and the determined values are in good agreement with the certified values. The proposed method has also been successfully applied for the speciation of CH3Hg(+) and Hg(2+) in environmental water and human hair samples.
authors.affiliation: Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China; Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Shishuai
authors.initials: S
authors.lastname: Ma
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Man
authors.initials: M
authors.lastname: He
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Beibei
authors.initials: B
authors.lastname: Chen
authors.affiliation: Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China.
authors.forename: Wenchao
authors.initials: W
authors.lastname: Deng
authors.affiliation: Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China. Electronic address: binhu@whu.edu.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Hu
mesh_terms: D004785:Environmental Pollutants / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D052203:Ferrosoferric Oxide / Q000737:chemistry; D006197:Hair / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D060328:Magnetic Phenomena; D013058:Mass Spectrometry / Q000379:methods*; D008628:Mercury / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D017646:Organosilicon Compounds; D058626:Plasma Gases / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D017646:Organosilicon Compounds; D058626:Plasma Gases; D012821:Silanes; D014867:Water; D012822:Silicon Dioxide; C102833:(3-mercaptopropyl)trimethoxysilane; D008628:Mercury; D052203:Ferrosoferric Oxide
keywords: Inductively coupled plasma mass spectrometry; Inorganic mercury; Magnetic solid phase extraction; Methylmercury; Speciation