催化动力学光度法测定痕量锰(Ⅱ)

Spectrophotometric Determination of Trace Manganese by Catalytic Kinetics

研究在ｐＨ值约为１０－０ 的Ｎａ２Ｂ４Ｏ７ＮａＯＨ 介质中，Ｍｎ（ Ⅱ）对高碘酸钾氧化偶氮胂Ｍ 褪色的指示反应催化作用及其动力学条件，以此为依据建立一种高灵敏、高选择性测定痕量Ｍｎ（ Ⅱ） 的新方法，可测０ ．０２ ～０．１２ ｍｇ／Ｌ范围的Ｍｎ（ Ⅱ） ，其测定波长为５５０ ｎｍ ．该法简便，分析费用低，检测限为４－４５ ×１０－ ７ ｇ／Ｌ．可用于铁合金中痕量Ｍｎ（ Ⅱ） 的测定．

A method was investigated for the determination of trace manganese(Ⅱ) which can catalyze the discoloring reaction of potassium periodate to oxidize arsenazo M in Na\-2B\-4O\-7 NaOH solution,and the kinetic condition was also discussed.The method has high sensitivity and selectivity for determining trace manganese(Ⅱ) in samples.The rang of determination is 0.02～0.12 mg/L,the detection wavelength is 550 nm and the detection limit is 4.45×10\+\{-7\}g/L.The method is characterized by its simplicity and small expense,and may be used to determine trace Mn(Ⅱ) in ferroalloys.