Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Mordant Blue 31 as a New Fluorometric Reagent for Aluminum, Gallium, and Scandium
Keiz\={o} Hiraki
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1972 Volume 45 Issue 3 Pages 789-793


A sensitive fluorometric determination of aluminum, gallium, and scandium with Mordant Blue 31 was worked out. The reagent reacts with aluminum, gallium, scandium, yttrium, lanthanum, lutetium, indium, and magnesium in acidic or basic medium to form complexes with reddish yellow fluorescence. The complexes of aluminum (pH: 5–7), gallium (pH: 4), and scandium (pH: 6) exhibit strong fluorescence with an emission maximum at 590, 600, and 610 nm, respectively. The effects of time, pH and the concentration of the reagent were investigated. In acidic medium, aluminum, gallium, and scandium were found to form 1:1 complex with Mordant Blue 31. Under the optimum conditions, 0.1–3μg of aluminum, 1–12μg of gallium, and scandium in 25 ml sample solution could be determined. Although the fluorescence intensity of aluminum and gallium complexes was a little lower than that of the lumogallion complexes, Mordant Blue 31 was also applicable as a fluorometric reagent for aluminum and gallium. Since scandium-Mordant Blue 31 complex exhibits the strongest fluorescence of all other scandium-azo dye complexes, the reagent was used as a fluorometric reagent for scandium.

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