Abstract：In hydrochloric acid - potassium acid phthalate medium, iron had inhibitory effect on the fading reaction of methyl green oxidized by potassium periodate. Moreover, the absorbance difference between inhibitory reaction and non-inhibitory reaction at 458 nm showed good linearity to the mass concentration of iron in certain range. On the basis of this fact, a new determination method of trace iron by inhibitory kinetic spectrophotometry was established. The kinetic parameters of inhibitory fading reaction were measured. The apparent activation energy of inhibitory reaction was Ea = 0.85 kJ/mol, and the reaction rate constant was K = 6.0×10-4/s. The linear range of method was in range of 20-120 μg/L, and the detection limit was 8.39 μg/L. The proposed method was applicable for the determination of iron content in local iron tailings, with relative standard deviation (RSD) of determination results in the range 2.4 %-3.3 % and the recoveries of standard addition between 97 %-105 %.
樊雪梅，王书民. 铁-高碘酸钾-甲基绿体系阻抑动力学光度法测定铁尾矿中铁[J]. 冶金分析, 2013, 33(5): 63-66.
FAN Xue-mei, WANG Shu-min. Inhibitory kinetic spectrophotometric determination of iron in iron tailings with iron-potassium periodate-methyl green system. , 2013, 33(5): 63-66.
龚仁敏, 朱升学, 李恩黄, 等. Fe -H2O2-丽春红-1,10-菲罗啉体系催化动力学光度法测定痕量铁[J]. 理化检验;化学分册(Physical Testing and Chemical Analysis;Part B Chemical Analysis), 2000, 36 (10); 445-446.
