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Fe(Ⅲ)-5-Br-PADAP络合物光化学还原反应的抑制及其分析应用
Inhibition of photochemical reduction of Fe(Ⅲ)-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol complex and its analysis application
【摘要】 在乙酸、乙二酸、丙二酸、HF、H3PO4等缓冲溶液中,Fe(Ⅲ)-5-Br-PADAP络合物的光化学还原反应表明:乙酸能促进Fe(Ⅲ)-5-Br-PADAP络合物的光化学还原反应;HF、H3PO4初始能抑制该光化学还原反应,但随光照时间增加,该光化学还原反应仍能发生;乙二酸、丙二酸能抑制该光化学还原反应,其中丙二酸的抑制效果较好。确定了在丙二酸-丙二酸钠缓冲溶液中,Fe(Ⅲ)存在下,用5-Br-PADAP分光光度法测定Fe(Ⅱ)的实验条件,用于合成试样及铁矿中铁的价态分析。
【Abstract】 The photochemical reduction of Fe(Ⅲ)-5-Br-PADAP complex was studied in acetic acid,oxalic acid,malonic acid,hydrofluoric acid and phosphoric acid buffer solutions.The results show that acetic acid could promote the photoreduction of Fe(Ⅲ)-5-Br-PADAP;hydrofluoric acid and phosphoric acid initially inhibited the photoredution,but with the increase of illuminating time,the photoreduction continued to occur;oxalic acid and malonic acid inhibited the photoreduction of Fe(Ⅲ)-5-Br-PADAP complex remarkably,wherein malonic acid showed the strongest inhibitory effect.Accordingly,the optimized experimental conditions were established for spectrophotometric determination of Fe(Ⅱ) with 5-Br-PADAP in malonic acid-sodium malonate buffer solution in the presence of Fe(Ⅲ),and satisfactory results were obtained from the analysis of ferrous valences in both synthetic samples and iron ore using the method reported here.
【Key words】 Iron； 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol； Inhibitory photochemical reduction； Spectrophotometry；
- 【文献出处】 分析试验室 ,Chinese Journal of Analysis Laboratory , 编辑部邮箱 ,2007年05期
- 【分类号】O657.3
- 【被引频次】3
- 【下载频次】95