Abstract
A liquid-liquid extraction-spectrophotometric and atomic absorption spectrophotometric method is proposed for the microdetermination of gallium. Gallium is extracted at pH 3.5 with a chloroform solution of N-p-chlorophenyl-2-furohydroxamic acid ( N-p-CPFHA). Xylenol orange solution is added to the extract and the resulting mixed complex has a maximum absorbance at 550 nm with a molar absorptivity of 2.9 × 10 4 liters mol −1 cm −1. The colored system obeys Beer's law in the range 0.13–4.0 ppm gallium. The Sandell sensitivity is 0.0024 μg of gallium per centimeter squared per 0.001 absorbance. The effect of diverse ions on the extraction and determination of gallium is studied. Gallium was determined in the presence of indium and thallium. Alternatively, an atomic absorption spectrophotometric method is proposed for the metal-hydroxamate extract. The proposed methods have been applied to the determination of gallium in biological and alloy samples.
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