Spectrophotometric determination of gallium in aluminium with salicyldehyde-4-aminobenzoylhydrazone.

Spectrophotometric determination of gallium(III) with carminic acid and hexadecylpyridinium chloride

“…Aside from the more sensitive and relatively interference-free atomic absorption and emission spectrometric methods of gallium quantification [3,4], the cheaper and more common spectrophotometric methods require the use of colour-forming reagents such as rhodamine B [5], 4-(2-pyridylazo)-resorcinol (PAR) [6], 1-(2-pyridylazo)-2-naphthol (PAN) [7], xylenol orange [8], eriochrome black T [9], 2,6,7-trihydroxy-9-phenyl-3H-xanthen-3-one (phenylfluorone) [10], salicylaldehyde-4-aminobenzoylhydrazone [11] and 2-[2-(3,5-dibromopyridyl)-azo]-5-diethylaminobenzoic acid [12]. Unfortunately, most of these chromogenic reagents require preliminary operations in the form of Ga extraction into organic solvents [10].…”