title: Speciation analysis of mercury in water samples by cold vapor atomic absorption spectrometry after preconcentration with dithizone immobilized on microcrystalline naphthalene.
abstract: Trace amounts of inorganic mercury (Hg(2+)) and methylmercury cations (MeHg(2+)) were adsorbed quantitatively from acidic aqueous solution onto a column packed with immobilized dithizone on microcrystalline naphthalene. The trapped mercury was eluted with 10 ml of 7 mol L(-1) hydrochloric acid solution. The Hg(2+) was then directly reduced with tin (II) chloride, and volatilized mercury was determined by cold vapor atomic absorption spectrometry (CVAAS). Total mercury (Hgt) was determined after decomposition of MeHg(+) into Hg(2+). Hg(2+) and MeHg(+) cations were completely recovered from the water with a preconcentration factor of 200. The relative standard deviation obtained for eight replicate determinations at a concentration of 0.3 microg L(-1 )was 1.8%. The procedure was applied to analysis of water samples, and the accuracy was assessed via recovery experiment.
authors.affiliation: Department of Chemistry, Yazd University, Yazd, Iran. hshabani@yazduni.ac.ir
authors.forename: Ali Mohammad
authors.initials: AM
authors.lastname: Haji Shabani
authors.forename: Shayessteh
authors.initials: S
authors.lastname: Dadfarnia
authors.forename: Navid
authors.initials: N
authors.lastname: Nasirizadeh
mesh_terms: D003080:Cold Temperature; D003460:Crystallization; D004230:Dithizone / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008628:Mercury / Q000032:analysis*; D008767:Methylmercury Compounds / Q000032:analysis; D009281:Naphthalenes / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D007477:Ions; D008767:Methylmercury Compounds; D009281:Naphthalenes; D014874:Water Pollutants, Chemical; D014867:Water; D004230:Dithizone; D008628:Mercury