title: [Determination of trace manganese by non-organic solvents extraction catalytic spectrophotometry in Mn(II)-H2O2-EBT-PEG-2000 system].
abstract: A new non-organic solvents extraction catalytic spectrophotometric method for the determination of trace amounts of manganese was studied. The method is based onthe manganese (II) catalyzing hydrogen peroxide to oxidate o f eriochrome black T in hydroxide-ammonium chloride buffer medium. The reaction time and the degree of indicating reaction are controlled by non-organic solvents extraction equilibrium using polyethylene glycol-2000. The absorbance of polyethylene glycol-2000 phase is measured at 539 nm in weak acidic medium. The calibration graph is linear for 0.0080-0.55 microg x mL(-1) Mn (II), and the detection limit is 3.0 x 10(-9) g x L(-1). The method can be applied to the determination of trace manganese in tea and aluminum alloy with satisfactory results.
authors.affiliation: Department of Chemistry, Huaibei Coal Industry Teachers College, Huaibei 235000, China.
authors.forename: Deng-ming
authors.initials: DM
authors.lastname: Sun
authors.forename: Hua-cai
authors.initials: HC
authors.lastname: Fang
mesh_terms: D000643:Ammonium Chloride / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry; D007700:Kinetics; D008345:Manganese / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000032:analysis / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry*; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013662:Tea / Q000737:chemistry; D013696:Temperature
chemical_list: D001391:Azo Compounds; D006878:Hydroxides; D010936:Plant Extracts; D012997:Solvents; D013662:Tea; D000643:Ammonium Chloride; D011092:Polyethylene Glycols; D008345:Manganese; C031356:hydroxide ion; D006861:Hydrogen Peroxide; C014527:Eriochrome Black T