Spectrophotometric determination of traces of gallium and indium with 1-(2-pyridylazo)-2-naphthol

Highly Copper(II) Ion-selective Transport through Liquid Membrane Containing 1-(2-Pyridylazo)-2-naphthol

“…According to the literature, it may be expected that some of the metal ions that were not investigated, such as uranium(IV), thallium(III), indium, titanium and rare earths, will not interfere, because of partial extraction in the pH range used. [28][29][30] This study demonstrates the usefulness of the liquidmembrane technique for making it possible to combine extraction and stripping operations in a single process and reducing the solvent inventory requirements. In conclusion, therefore, the above system, which is highly selective for copper(II) is a potential candidate for practical use in copper separation.…”

Utility of solid phase extraction for UV-visible spectrophotometric determination of gallium in environmental and biological samples

“…Aside from the more sensitive and relatively interference-free atomic absorption and emission spectrometric methods of gallium quantication, 33 the cheaper and more common spectrophotometric methods require the use of colour-forming reagents such as rhodamine B, 34 4-(2-pyridylazo)-resorcinol (PAR), 35 1-(2pyridylazo)-2-naphthol (PAN), 36 xylenol orange, 37 eriochrome black T, 38 2,6,7-trihydroxy-9-phenyl-3H-xanthen-3-one (phenyl uorone), 39 salicylaldehyde-4-aminobenzoylhydrazone, 40 and 2-[2-(3,5dibromopyridyl)-azo]-5-diethylamino-benzoic acid. 41 Unfortunately, most of these chromogenic reagents require preliminary operations in the form of Ga extraction into organic solvents.…”

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].…”