An-Najah Blogs :: An-Najah Blogs :: en-us Wed, 29 Jun 2022 22:14:58 IDT Wed, 29 Jun 2022 22:14:58 IDT A Sensitive Catalytic Method for the Determination of Copper by Its Catalytic Effect on the Potassium Bromate Indigo Carmine Reaction ArticlesA method for catalytic determination of copper II is presented The method is based on the catalytic effect of copperII on the rate of oxidation of indigo carmine by potassium bromate The method is satisfactory for the determination of copperII in the range 12 to 38 ngmL Effect of acidity indigo carmine potassium bromate temperature and tolerance limits of foreign ions are reported The method was applied to the determination of copper in synthetic and in various milk samples Instrumentation Science Technology Volume 22 Issue 4 November 1994 pages 355 - 363Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone ArticlesA method for simultaneous spectrophotometric determination of total iron ironII and ironIII in mixtures containing other metal ions has been described The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone DPKBH in 50 vv ethanolic solution IronII complex with DPKBH exhibits two absorption maxima at 360 and 650 nm meanwhile ironII1 complex with DPKBH exhibits only one maximum at 360nm IronII and ironIII complexes with DPKBH have similar behaviour at 360nm Iron forms 1:2 complexes with the reagent Beers laws are obeyed over the ranges 01-2 gml-1 and 04-5 grn1-l for ironII complexes at 360 and 650nm respectively IronIII showed results similar to those obtained for ironII at 360nm The effect of pH effect of excess reagent the stability of complexes and the tolerance limit of many metal ions have been reported The method is applied to the determination of total iron ironI1 and ironII1 in synthetic solutions Spectroscopy Letters Volume 22 Issue 9 November 1989 pages 1203 - 1214