Spectrophotometric determination of gallium with 1-(2,4-dihydroxyphenylazo)-2-naphthol-4-sulfonic acid |
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| Authors: | Liang Chang John H. Yoe |
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| Affiliation: | Pratt Trace Analysis Laboratory, Department of Chemistry, University of Virginia, Charlottesville, Va.U.S.A. |
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| Abstract: | A new spectrophotometric method for the determination of gallium is described using 1-(2,4-dihydroxyphenylazo) -2-naphthol-4-sulfonic acid (DHPAN) as a reagent. The color reaction has a sensitivity of 0.013 μg Ga per cm2 for log 10/1=0.005 at 500 mμ and obeys Beer's law up to 2.8 p.p.m. The effects of pH, time, order of addition of the reagents, temperature and diverse ions were investigated. Gallium is separated from interfering ions by solvent extraction. |
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