Spectrophotometric determination of periodate with amodiaquine dihydrochloride and its application to the indirect determination of some organic compounds via the malaprade reaction
- 1 January 1987
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 112 (11) , 1519-1522
- https://doi.org/10.1039/an9871201519
Abstract
Periodate has been determined at the p.p.m. level by it's reaction between pH 7 and 8.5 with amodiaquine dihydrochloride [7-chloro-4-(3′-diethylaminomethyl-4′-hydroxylanilino)quinoline dihydrochloride] which yields a chromogen believed to be a 1,4-benzoquinoneimine. The chromogen is extracted into chloroform for spectrophotometric measurement. The maximum molar absorptivity at 442 nm is 2.03 × 103 l mol–1 cm–1 and Beer's law is valid over the concentration range 10–60 p.p.m. with an over-all relative standard deviation of 0.7%. No interference is caused by a 100-fold (m/m) excess of iodate and this has enabled the method to be used for the indirect determination of ethylene glycol, glycerol and tartaric acid via the Malaprade reaction.Keywords
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