Spectrophotometric determination of gallium(III) with phenylfluorone in the presence of hexadecylpyridinium bromide and pyridine.
Phenylfluorone reacts with gallium in the presence of hexadecylpyridinium bromide and pyridine to form a water-soluble chelate with an absorption maximum at 570 nm and constant absorbance in the pH range 4.0-5.5. At this wavelength, Beer's law is obeyed up to 4.3 x 10(-6)M gallium. The sensitivity is very high and the molar absorptivity is 1.48 x 10(5) 1.mole(-1).cm(-1). The chelate has been utilized in the determination of gallium at the mug level. The ratio of gallium to phenylfluorone in the complex is 1:2.
Sakuraba
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Industrial Research Institute of Aomori Prefecture, Fukuro-machi, Hirosaki-shi, 036 Japan.