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The colour reaction of 2,3-dihydroxypyridine with Iron(III) in 1 N mineral acids

✍ Scribed by K.E. Curtis; J.A. Thomson; G.F. Atinkson

Publisher: Elsevier Science
Year: 1970
Tongue: English
Weight: 376 KB
Volume: 49
Category: Article
ISSN: 0003-2670
DOI: 10.1016/s0003-2670(00)86799-9

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✦ Synopsis

chosen, ~-3.5, the reagent is highly selective, reacting with fewer metals than furans-aldoxime0 or thiophene-2-aldoxime 8. Moreover, the water solubility and stability to hydrolysjs of selenophene-2-aldoxime makes it an ideal reagent for routine use. For concentrations of palladium lower than 500 p.p.m., the indirect method is suggested, its main advantage being in its selectivity and the overall time taken for a determination. The usual methods for the determination of palladium(D) in this range require a longer time; calorimetric methods usually involve &elate formation and subsequent solvent extraction before the final measurement, and the precision of all these methods is of the same order.

For concentrations' greater than 5 * Io-4 iti, the direct arnperometric determination is recommended since the inherent error is relatively low. A comparison of the results obtained with furan-z-aldoxime" and selenophene-s-aldoxime indicates that the precision and accuracy with the latter reagent are superior.

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