title: Spectrophotometric and AAS determination of trace amounts of cobalt after preconcentration by using alpha-benzilmonoxime-microcrystalline naphthalene.
abstract: The formed cobalt-a-benzilmonoxime complex was adsorbed onto microcrystalline naphthalene. Then it was determined by zero and first derivative spectrophotometry and by atomic absorption spectrophotometry (AAS) after dissolving into chloroform and methylisobutylketone (MIBK), respectively. Under optimum conditions, cobalt in the range of 1.0 - 20.0, 0.4 - 30.0 and 2.5 - 50.0 microg could be determined by spectrophotometry, first derivative spectrophotometry and AAS method, respectively. By the method, a preconcentration factor equal to approximately 30 for cobalt was obtained. The effect of diverse ions on the determination of 5.0 microg cobalt was also studied. The method was successfully applied to some pharmaceuticals and synthetic alloy samples.
authors.affiliation: Department of Chemistry, Faculty of Basic Sciences, University of Mohaghegh Ardebili, Ardebil 179, Iran. Habibollah-Eskandari@uma.irost.net
authors.forename: Habibollah
authors.initials: H
authors.lastname: Eskandari
authors.forename: Gholam Hassan Imanzadeh
authors.initials: GH
authors.lastname: Karkaragh
authors.forename: Ali Ghanbari
authors.initials: AG
authors.lastname: Saghseloo
authors.forename: Ghadamali Bagherian
authors.initials: GB
authors.lastname: Dehaghi
mesh_terms: D001593:Benzyl Compounds / Q000737:chemistry*; D003035:Cobalt / Q000032:analysis* / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D009281:Naphthalenes / Q000737:chemistry*; D009942:Organometallic Compounds / Q000032:analysis* / Q000737:chemistry; D010091:Oximes / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods*
chemical_list: D001593:Benzyl Compounds; D007477:Ions; D009281:Naphthalenes; D009942:Organometallic Compounds; D010091:Oximes; C484409:alpha-benzilmonoxime; D003035:Cobalt