关键词: 溴酸钾, 结晶紫, 催化比色, 铁(Ⅲ)测定

Abstract: A simple and sensitive catalytic colorimetry has been developed for determining trace Fe(Ⅲ). It is based on the catalysis of Fe(Ⅲ) to decoloration of crystal violet oxidized with potassium bromate in diluted sulfuric acid medium in the presence of ascorbic acid. The linear range of determination is from 8 to 80 ng/25mL Fe(Ⅲ). The sensitivity is 3.2×10^-10 g/mL. The method has been applied to the determination of trace Fe(Ⅲ) in natural water and human hair with satisfactory results.

Key words: POTASSIUM BROMATE, CRYSTAL VIOLET, CATALYTIC COLORIMETRY, DETERMINATION IRON(Ⅲ)