title: Spectrophotometric method for the determination of manganese with phenylfluorone in the presence of Triton X-100 and cetylpyridinium chloride in pharmacological preparations and vegetable fertilizers.
abstract: A simple and very sensitive method for the spectrophotometric determination of manganese in pharmacological preparations and vegetable fertilizers is proposed. The method is based on the formation of a blue coloured complex of Mn (II) with 9-phenyl-2,3,7-trihydroxy-6-fluorone (PF) in the presence of cetylpyridinium chloride (CP) and Triton X-100. Optimum concentrations of PF, CP, Triton X-100 and pH ensuring maximum absorbance were defined. The complex Mn(II)-PF-CP-Triton X-100 shows maximum absorbance at 591 nm with the molar absorptivity value 1.77x10(5 )L mol(-1 )cm(-1). The detection limit of the method is 0.004 microg mL(-1). The Beer's law is obeyed for manganese concentrations in the range 0.02-0.2 microg mL(-1). The effect of foreign ions was elucidated. The statistical evaluation of the method was carried out for six determination using 5 microg Mn and the following results were obtained: standard deviation 0.021, confidence interval 5.05+/-0.05 microg Mn. The method has been applied for the determination of manganese in pharmacological preparations (Biovital, Kinder Biovital) and vegetable fertilizers (Hydrovit 100, Florovit).
authors.affiliation: Institute of Chemistry, University of Silesia, Szkolna 9, 40-006, Katowice, Poland.
authors.forename: Wanda
authors.initials: W
authors.lastname: Winkler
authors.forename: Franciszek
authors.initials: F
authors.lastname: Buhl
authors.forename: Agata
authors.initials: A
authors.lastname: Arenhövel-Pacuła
authors.forename: Urszula
authors.initials: U
authors.lastname: Hachuła
mesh_terms: D002138:Calibration; D002594:Cetylpyridinium; D005308:Fertilizers / Q000032:analysis*; D005452:Fluoresceins / Q000032:analysis*; D008345:Manganese / Q000032:analysis*; D017830:Octoxynol; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000379:methods*; D013499:Surface Properties; D014675:Vegetables / Q000737:chemistry
chemical_list: D005308:Fertilizers; D005452:Fluoresceins; D004364:Pharmaceutical Preparations; D008345:Manganese; C010159:fluorone Black; D017830:Octoxynol; D002594:Cetylpyridinium