Kaempferol (3,5,7,4′-tetrahydroxyflavone) as a chromogenic reagent for tin(IV)

Abstract

Kaempferol forms a yellow colored chelate with tin(IV) in 0.1 to 0.01 N HCl medium. Based on this reaction a sensitive spectrophotometric method for determination of micro amounts of tin(IV) has been developed. The sensitivity of the color reaction 0.0029 μg of Sn/cm 2  log I 0 I = 0.001 , at 430 nm in 0.1 N HCl medium and Beer's law is obeyed up to 3.6 ppm of tin. Several complexing anions do not interfere and they have been used for masking some of the cations which interfere in the determination.