基于在pH4.0的HAc-NaAc缓冲溶液介质中和在聚乙烯醇(PVA)表面活性剂的增敏作用下,痕量铁(Ⅲ)可催化溴酸钾氧化酚藏花红的褪色反应,建立了一种测定痕量铁的新催化动力学光度法.优化了相关的测定条件和试剂的用量,考察了其它离子对测定的影响.在最优化的实验条件下,测得催化褪色反应的表观活化能为84.03 kJ/mol,方法的线性范围为0.02～0.32 μg/mL,铁(Ⅲ)的检测限为6.6×10-7 g/L.对玻璃及陶瓷样品中铁的测定,相对标准偏差为2.6％～4.1％,样品加标准回收率在94％～102％之间.
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