STUDIES ON THE VOLTAMMETRIC BEHAVIOR OF SALICYL FLUORONE AND GALLIUM-SALICYL FLUORONE COMPLEX

In the NH4Cl supporting electrolyte, within the pH range from 1 to 5, an irreversible adsorptive reducing wave of salicyl fluorone(SAF) was obtained. The electrode process was verified as follow: [GRAPHICS] On the surface of mercury electrode, the adsorption of SAF obeys Frumkin isotherm. In 0.2 mol/l potassium hydrogen phthalate/HCl buffer solutio n, at pH 3.0, the sensitive adsorptive complex wave of Ga-SAF was obta ined by linear sweep voltammetry. The composition of the electroactive complex was determined as Ga:SAF = 1:1. The peak height of the comple x is proportional to the concentration of Ga(III) in the range of 1.5 x 10(-9) to 6.0 x 10(-7) mol/l, the detection limit is 1.0 x 10(-9) mo l/l. The proposed method has been applied to the determination of gall ium content in aluminium alloys.