Fe(Ⅲ)-H_2O_2-酸性铬蓝K体系催化光度法测定痕量铁

Catalytic spectrophotometric determination of trace Fe(Ⅲ) With Fe(Ⅲ)-H_2O_2-acid Chrome Blue K system

在 p H=9.35的硼砂 -HCl体系缓冲溶液中 ,Fe( )能催化酸性铬蓝 K的氧化褪色反应 ,据此建立了一个测定痕量铁的新催化动力学分光光度法 .该方法在所选条件下 ,lg( A0 / A)与 Fe( )含量在 0 .0 1μg/ m L～ 0 .2 0μg/ m L范围内呈线性关系 ,定量检测限为 6.4× 1 0 -9g/ L,ε=3.7× 1 0 4 L· cm-1· mol-1.

A new catalytic spectrophotometric method for the determination of trace Fe(Ⅲ) has been developed which has higher sensitivity and selectivity. The method was based on the catalytic effect of Fe(Ⅲ) on the oxidation of acid Chrome Blue K by hydrogen peroxide.The linear range for the determination of Fe(Ⅲ) was 0.01 μg /mL^0.20 μg/mL and the detection limit is 6.4×10\+\{-9\} g/L.