二溴羧基偶氮胂催化动力学光度法测定痕量锰(Ⅱ)的研究

Catalytic Spectrophotometric Determination of Trace Manganese (Ⅱ) with DBKAA

在 HAc- Na Ac介质中 ,在氨三乙酸存在下 ,表面活性剂溴化十六烷基三甲胺对锰 ( )催化高碘酸钾氧化二溴羧基偶氮胂的褪色反应有强烈的增敏作用。研究了反应的最佳条件 ,建立了动力学光度法测定痕量锰的新方法。该方法的检出限为4.1 0× 1 0 - 11g/m L,线性范围 0～ 1 4 μg/L,用于食品及铝合金中痕量锰 ( )的测定 ,结果令人满意。

A new catalytic spectrophotometric method for the determination of trace amount of manganese(Ⅱ) has been developed. The method was based on oxidation of DBKAA by potassium periodate in HAc NaAc medium in the presence of NTA as activator and CTMAB as sensitizer. The reaction conditions have been discussed. The detection limit of the method was 4.10×10 -11 g/mL. The linear range of the determination was 0~14 μg/L for Mn(Ⅱ). Satisfactory results were abtained for the determination of Mn(Ⅱ) in food and aluminum alloy.