Abstract
A kinetic catalytic method for the determination of ultramicro quantities of some 8-hydroxyquinoline derivatives is proposed, and consideration is given to the effect of noncatalytic reactions on this type of determination. The oxidation of alizarin S by hydrogen peroxide in the presence of ammonium carbonate, with manganese as a catalyst, is applied as the indicator reaction for the determination of 8-hydroxyquinoline sulphate, 5,7-diiodo-8-hydroxyquinoline, 5-chloro-7-iodo-8-hydroxyquinoline and 7-iodo-8-hydroxyquinoline-5-sulphonic acid by the tangent method; the reaction rate is followed spectrophotometrically. The concentrations determined range from 2.85 · 10 -8 M to 11.3 · 10 -8 M, with standard deviations of 3.4–10.0 %.
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