title: [Catalytic spectrophotometry for the determination of trace cobalt by the new indicating reaction].
abstract: A kinetic spectrophotometric method for the determination of trace cobalt(II) was established. It was based on the Co(II) catalyzing the discoloring reaction of malachite green by potassium periodate in the presence of HBO3-Na2B4O7 solution (pH = 8.5). The sensitivity of the method is 2.1 x 10(-10) g.mL-1. The range of determination is 0-0.8 microgram.25 mL-1. The apparent activation of catalytic reaction is 37.94 kJ.mol-1. The method has been applied to the determination of cobalt in tea leaf and injection of vitamin B12 samples with satisfactory results.
authors.affiliation: Department of Chemistry, Changchun Normal College, Changchun 130032, China.
authors.forename: Yan-juan
authors.initials: YJ
authors.lastname: Qi
authors.forename: Xiao-ju
authors.initials: XJ
authors.lastname: Wang
authors.forename: Hong-mei
authors.initials: HM
authors.lastname: Li
authors.forename: Hong-wei
authors.initials: HW
authors.lastname: Gao
mesh_terms: D002384:Catalysis; D003035:Cobalt / Q000032:analysis*; D007700:Kinetics; D010504:Periodic Acid; D017680:Potassium Compounds; D012394:Rosaniline Dyes; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000379:methods*; D013662:Tea / Q000737:chemistry*; D014805:Vitamin B 12 / Q000032:analysis
chemical_list: D017680:Potassium Compounds; D012394:Rosaniline Dyes; D013662:Tea; D010504:Periodic Acid; C005095:malachite green; D003035:Cobalt; D014805:Vitamin B 12; C037192:potassium periodate