Determination of Trace Iron(III) by Catalytic Fluorescence Spectrophotometery

Based on catalytic discoloring effect of trace iron(Ⅲ) on hydrogen peroxide oxidation of indigo carmine in the solution of dilute sulfuric acid,a new method of determining trace iron(Ⅲ) by catalytic fluorescence spectrophotometery was established.The linear range was 0.7~80 ng·mL-1,the detection limit was 2.96×10-11 g·L-1,the recovery rate was 98.37%~101.56%.The results for the determination of trace iron(Ⅲ) in tap water were satisfactory.