Photometric Determination of Gallium(Ⅲ) in Fly Ash by Its Reaction with Butyrhodamine B in Presence of Polyethylene Glycol and Using Butyl Acetate as Extraction Solvent

In the presence of polyethylene glycol,a pinkish red complex was formed between Ga(Ⅲ) and butyrhodamine B in HCl medium,and extracted with butyl acetate.Absorbance of the complex was measured in the organic phase at its maximum absorption wavelength of 558 nm.Molar absorptivity found under this condition was 2.79×105L·mol-1·cm-1.Lambert-Beer′s law was kept in the range of 0.018-0.52 mg·L-1 of Ga(Ⅲ).Test for recovery was made,giving values of recovery in the range of 93.0%-98.2%.Detection limit (3S/N) found for the method was 0.018 mg·L-1.