催化动力学光度法测定痕量铁的研究

Spectrophotometric Determination of Trace Iron by Catalytic Kinetics

在酸性介质中Fe（Ⅲ）对过氧化氢氧化对氨基苯磺酸的反应具有强烈的催化作用，本文研究了反应的动力学条件，建立了测定痕量铁的新方法，方法检出限为5.5×10－ng／mL，线性范围为6～110ng／25mL，应用于水及面粉中Fe（Ⅲ）的测定，结果满意．

A new indicator reaction was proposed for the determination of trace iron. In thepresence of iron P-aminobenzoic acid can be oxidized with hydrogen peroxide in a acid solution.The optimam condition influencing the rate of catalytic reaction was established. Detective limit is5. 5 × 10-11g/mL and the range of determination is 6. 0～110ng/25mL. This method has beensuccessfully applied to the determination of trace iron in water and food samples.