KBrO_3-KI-季胺新体系催化光度法测定痕量铁及其机理研究  

Kinetic Spectrophotometric Determination of trace Iron(Ⅲ) by KBrO_3-KI-Tetrabase New System

作　　者：魏永前[1] 赵康[1] 于琴[1] 李建国[1] 

机构地区：[1]苏州大学化学化工学院,江苏省苏州市215006

出　　处：《光谱实验室》2005年第5期1007-1010,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：国家自然科学基金(20275025);苏州大学青年科研(Q3109201)资助项目

摘　　要：基于pH=3.5的HAc-NaAc介质中,一定量KI存在下Fe()催化KBrO3氧化季胺[4,4′-(二甲氨基)-二苯基甲烷]显色的反应,拟定了测定痕量铁的新方法。该法操作简便快速,灵敏度高,选择性好,测定铁的线性范围为0.5—20μg/L,检出限为0.15μg/L,用于测定水样中痕量铁,结果满意;并对反应的机理进行了探讨。A new kinetic spectrophotometric method for the determination of trace amounts of iron（ Ⅲ ） has been proposed. It is based on the iron （ Ⅲ ） catalysed coloring reaction of tetrabase[4,4′-bis（dimethylamino）diphenylmethane] oxidized by potassium bromate in the presence of potassium iodide in HAc-NaAc（pH=3.5）medium. The linear range of determination of iron is 0.5-20μg/L, the detection limit is 0.15μg/mL. The method is simple ,rapid,sensitive and with good selectivity. It has been used for the determination of trace amounts of iron （ Ⅲ ） in water samples with satisfactory results. The mechanism of the reaction is discussed in detail.

关 键 词：动力学光度法 铁 溴酸钾-碘化钾-季胺[4 4'-(二甲氨基)-二苯基甲烷]体系 

分 类 号：O657.32[理学—分析化学]