Fe(Ⅲ)-H_2O_2-偶氮胂Ⅲ体系催化光度法测定痕量铁的研究

Study on catalytic spectrophotometric determination of trace iron() with Fe(Ⅲ)-hydrogen peroxide-arsenazo Ⅲ system

研究了在稀H2 SO4 介质中 ,Fe3+ 催化H2 O2 氧化偶氮胂Ⅲ褪色反应的动力学条件 ,建立了催化动力学光度法测定痕量铁的新方法。在 2 5mL溶液中 ,方法的线性范围为 0～ 1 2 μg铁 ,检出限为 8 97× 10 - 1 1 g/mL。用于测定分析纯盐酸和硝酸中的痕量铁 。

The method is based on the catalytic effects of Fe() on the decoloring reaction of arsenazo oxidized by hydrogen peroxide.The kinetic conditions of the decoloring reaction are studied and a new catalytic kinetic spetrophotometry for determining trace iron is established.The detection limit for Fe(Ⅲ) in this method is 8.97×10^(-11) g/mL.The linear range is 0-1.2 μg/25 mL for Fe(Ⅲ).The method has been used to determine the trace iron in HCl and HNO_3 with satisfactory results.