Abstract
A new spectrophotometric procedure has been developed for the determination of tin in iron and steel. The procedure is based on the reaction of quinalizarin with stannic ion in ammonium acetate buffer solution of pH 3.0 to 3.3. The relation between the absorbance and the amount of tin conforms to Beer’s law at 550 mμ in the concentration range from 1 to 200 (γ) of tin using 10 mm cell. Tin was separated from large amount of iron by CO-precipitating with manganese dioxide. The precipitate was dissolved in hydrochloric acid and hydrogen peroxide, and tin was easily determined spectrophotometrically with quinalizarin. The method requries only 30 minutes after sample dissolution.
