反相流动注射催化光度法测定痕量锰的研究

Revers Flow Injection-catalytic Spectrophotometry for Determination of Trace Manhanese

本文基于在氨三乙酸活化下，锰（Ⅱ）对高碘酸钾氧化罗丹明Ｂ褪色的催化作用，建立了痕量锰的反相流动注射分析（ｒＦＩＡ）新方法。该法选择罗丹明Ｂ溶液的最大吸收波长５５５ｎｍ作为测定波长，方法的线性范围为０～１８０μｇ／Ｌ，检出限为５．５μｇ／Ｌ锰（Ⅱ），对２０μｇ／Ｌ锰平行测定１１次的相对标准偏差为１．５％，进样频率为３６次／ｈ。方法应用于水样、黄豆和标准铝合金样中痕量锰的测定。

A rapid catalytic spectrophotometric method for the determination of trace manganese based on manganese catalyzing decoloration reaction of rhodamin B with potassium periodate in the presence of nitrilo triacetic acid has been established by reverse flow injection technique. The detecting wavelength was 555nm ,the linear range is 0_180ug/L and the detection limit is 5 5ug/L. The relative standard deviation is 1 5% obtained from 11 standard solution each containing20ug/L of manganese. 36 samples can be analysed per hour. The method was applied to the determination of manganese in nature water. Soybean and aluminium alloy with satisfactory results.