溴酸钾氧化溴百里酚蓝催化光度法测定痕量锰

Photometric Determination of Trace of Manganese by Its Catalytic Oxidation of Bromothymol Blue with Potassium Bromate

研究了在磷酸介质中，锰（Ⅱ）催化溴酸钾氧化溴百里酚蓝的褪色反应．建立了测定痕量锰 的新方法．方法检出限２．２７×１０－６ｇ／Ｌ线性范围０．５～５．５μｇ／２５ｍＬ方法简便。适用于铝合金、发 样、米粉、水中锰的测定．

This paper studies a new catalytic photometric method for determination of trace of manganese. The method is based on the oxidation of bromothymol blue by potassium bromate leading to a color-fading of bromothymol blue. The limit of detection for manganese is 2.27 x 10 -6g/L. A linear relationship holds between the intensity of color-fading and concentration of manganese over the range of 0.5~5.5g/ 25 mL.The method is quite convenient in operation and has been applied to the determination of manganese in Aluminium alloys,hair.rice flour and water.