The Use of Some Hydrazine Derivatives in the Separation and Microdetermination of Aluminum

The economic importance of aluminum metal pushed us to evaluate a rapid and accurate method for its separation and determination. The study introduces Girard's reagent P(HAPH) as a good chelating agent for the flotation of Al(III). The different parameters affecting the flotation separation process are investigated in detail. It was found that 1x10-4 mol/L HAPH is sufficient to separate 2.5x10-5 mol/L Al(III) using 1x10-3 mol/L oleic acid as a surfactant at ph ≡ 6 and at room temperature (25 degree C) with ≡ 100% efficiency. The effect of foreign ions is also studied and the data obtained show that most of the investigated cations and anions have no adverse effect on the flotation efficiency of Al(III). The decrease in the efficiency in the presence of some heavy metals may be due to the formation of metal oleates. The flotation procedure is successfully applied to remove 2.5x10-5 mol/L of Al(III) added to some natural samples obtained from different locations. Trials are made to suggest the mechanism of flotation depending on the data obtained from the physicochemical studies on the solid complexes isolated in the absence and presence of oleic acid. The use of HAPH was extended to the spectrophotometric microdetermination of Al(III) in the presence of K;[Fe(CN)6] , PFC , giving AI-HAPH-PFC compound with blue colour. This gives a new spectrophotometric method for determining 2x10-4 mol/L of Al(lll) at 730 nm with molar absorptivity of 3.42x103 L mol-1 cm-1 . The different analytical parameters are investigated