title: Preconcentration, speciation and determination of ultra trace amounts of mercury by modified octadecyl silica membrane disk/electron beam irradiation and cold vapor atomic absorption spectrometry.
abstract: Mercury (II) and methyl mercury cations at the Sub-ppb level were adsorbed quantitatively from aqueous solution onto an octadecyl-bonded silica membrane disk modified by 2-[(2-mercaptophyenylimino)methyl] phenol (MPMP). The trapped mercury was then eluted with 3ml ethanol and Hg2+ ion was directly measured by cold vapor atomic absorption spectrometry, utilizing tin (II) chloride. Total mercury (Hgt) was determined after conversion of MeHg+ into Hg2+ ion by electron beam irradiation. A sample volume of 1500ml resulted in a preconcentration factor of 500 and the precision for a sampling volume of 500ml at a concentration of 2.5microgl(-1) (n=7) was 3.1%. The limit of detection of the proposed method is 3.8ngl(-1). The method was successfully applied to analysis of water samples, and the accuracy was assessed via recovery experiment.
authors.affiliation: Department of Chemistry, Yazd University, Yazd, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Ashkenani
authors.forename: Shayessteh
authors.initials: S
authors.lastname: Dadfarnia
authors.forename: Ali Mohammad Haji
authors.initials: AM
authors.lastname: Shabani
authors.forename: Abbas Ali
authors.initials: AA
authors.lastname: Jaffari
authors.forename: Abbas
authors.initials: A
authors.lastname: Behjat
mesh_terms: D003080:Cold Temperature; D004583:Electrons; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D008628:Mercury / Q000032:analysis* / Q000737:chemistry*; D015394:Molecular Structure; D012822:Silicon Dioxide / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014835:Volatilization
chemical_list: D008024:Ligands; C026679:octadecylsilica; D012822:Silicon Dioxide; D008628:Mercury