Species distribution of polymeric aluminium ferrum——timed complexation colorimetric analysis method of Al-Fe-Ferron

摘要

The effects of the colorimetric buffer solutions were investigated while the two colorimetric reactions of A1 ferron complex and Fe ferron complex occurred individually, and the effects of the testing wavelength and the pH of the solutions were also investigated. A timed complexation colorimetric analysis method of A1 Fe ferron in view of the total concentration of ｛A1+Fe｝ was then established to determine the species distribution of polymeric Al Fe. The testing wavelength was recommended at 362 nm and the testing pH value was 5. With a comparison of the ratios of n Al / n Fe , the standard adsorption curves of the polymeric Al Fe solutions were derived from the experimental results. Furthermore, the solutions’composition were various in both the molar n Al / n Fe ratios, i.e. 0/0, 5/5, 9/1 and 0/10, and the concentrations associated with the total [A1+Fe] which ranged from 10 -5 to 10 -4 mol/L.