A study on determination of trace Manganese(II) in water samples by stopped-flow injection catalytic photometry

On the basis of the catalytic action of trace manganese to fading reaction of potassium periodate and magneson Ⅰ in buffer solution,a stopped-flow injection catalytic photometric method for the determination of trace manganese in water was developed.Under the optimum conditions,standard curve with good linearity and broad linear range can be obtained in the ranges of 2～10 μg/L,10～160 μg/L and 160～1000 μg/L.The detection limit for Mn(Ⅱ) is 0.12 μg/L at 6 h sampling frequency,and the relative standard deviation is 4.90%(n=6).A satisfactory result can be achieved with the proposed method to analyze the Mn(Ⅱ) in real environmental water samples,and the range of recovery is 95.5%～102%.