A simple continuous flow system for mole ratio determination and photometric titration

Abstract

A simple continuous flow system for mole ratio determinationand photometric titration was developed and applied for the study of some ironcomplexes behaviors in various pH solutions. By using photometric measurementit was found that pH of the solutions affect the maximum absorption (lmax), molarabsorptivity and the mole ratio of iron complexes, especially theiron(III)-salicylate complex.?? As the pHof the solution increases it was found that the maximum absorption of theiron(III)-salicylate complex was shifted to a shorter wavelength and the moleratio of the complex changed from 1:1 in highly acidic condition to 1:2 and 1:3in the higher pH solutions. Whereas pH had less effect on these parameters ofiron(II)-1,10-phenanthroline, iron(III)-EDTA and iron(III)-thiocyanatecomplexes. The system was also applied for direct and indirect photometrictitration between iron(III) and EDTA. It was found that high accuracy andprecision were obtained.