Photometric studies of the complex formation of Cu 2+ and Cr 3+ ions with Sudan Red B

Abstract

Photometric method was used to study the complex formation of Sudan Red B with Cu 2+ and Cr 3+ ions. The absorption spectra were monitored and the conditions were optimized in terms of dye and metal concentration, pH and cationic and anionic effects. The log β (stability constants) of the metal–dye complex were calculated using Job's method and these were of the order of 11 and 11.6 for Cr 3+ and Cu 2+ complex, respectively.