Abstract：In dilute sulfuric acid medium, trace Fe had strong inhibitory effect on the fading reaction of ethyl orange oxidized by potassium bromate. The ethyl orange showed a sensitive polarographic adsorptive wave at 0.60 V on electrode in ammonia medium. Based on this, the change of ethyl orange concentration in inhibitory reaction was monitored by polarography. Consequently, a new determination method of trace Fe by inhibitory kinetics polarography in Fepotassium bromate ethyl orange system was established. The effect of sulfuric acid dosage, potassium bromate dosage, ethyl orange dosage, reaction temperature and time on the determination of Fe was investigated. Under the optimal conditions, the linear range of method was 0.004 80.4 μg/mL. The detection limit was 0002 1 μg/mL. The proposed method was applied to the determination of iron in water. The results were consistent with those obtained by flame atomic absorption spectrometry. The relative standard deviation (RSD) was 1.2 %2.9 %.
李艳霞，贾华丽，李玖零. 阻抑溴酸钾氧化乙基橙褪色动力学极谱法测定痕量铁[J]. 冶金分析, 2012, 32(1): 56-59.
LI Yanxia,JIA Huali,LI Jiuling. Determination of trace iron by kinetic polarography based on inhibitory fading of ethyl orange oxidized by potassium bromate. , 2012, 32(1): 56-59.
