Spectrophotometric determination of platinum
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Anthranilic acid when heated on the steam bath with chloroplatinic acid at pH 5.0 gives a reddish violet complex having absorption maximum at 500 nm. The violet coloured system obeys Beer's law from 4 to 64 ppm of platinum (IV) with an optimum concentration range of 16 to 48 ppm where the per cent relative error per 1% absolute photometric error is 2.87.
Composition studies by three techniques suggest the formation by platinum(IV) of a 1∶1 complex with the reagent, and the dissociation constant of the complex is 2.6 · 10−4 only when measured at 28° C.
KeywordsColour Analytical Chemistry Platinum Steam Inorganic Chemistry
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