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于0. 3N H_2SO_4介质中及在80℃加热45分钟的条件下,伯胺喹啉与 IO_3~-反应生成桔红色氧化产物,其试剂与显色液的最大吸收波长分别位于420和470mm 处。显色液可稳定20小时以上。IO_3~-含量介于0～40及40～100μg/25ml 均遵守比耳定律;其摩尔吸光系数及桑德尔灵敏度分别为6. 8×10~3和1. 21×10~4l·mole~(-1) ·cm~(-1) 及0. 026和0. 014μg/cm~2. 方法的精密度及准确度均较好,其变动系数为3. 2和4. 6%,平均相对误差为±1. 8和3. 4%.伯胺喹啉曾用作检出 Ce(Ⅳ)、Au(Ⅲ)、Cr(Ⅶ)、V(Ⅴ)、IO_3~-及分光光度测定 Ce(Ⅳ)和 Au(Ⅲ)。本文是上述一系列科研工作的继续,作者对伯胺喹啉与 IO_3~-的显色反应进行了详细的研究。文中报导了此显色反应的吸收光谱、光度测定 IO_3~-的最佳条件、61种外来离子的影响以及方法的再现性和回收试验等。本法的优点是操作简便,选择性较好,显色液相当稳定,精密度和准确度均好.
In 0.3N H 2 SO 4 medium and heated at 80 ℃ for 45 minutes, the primary amine quinoline reacted with IO_3 ~ - to produce the orange red oxidation product. The maximum absorption wavelength of the reagent and the color developing liquid was 420 and 470mm, respectively. Color liquid can be stable for more than 20 hours. IO_3 ~ - content between 0 ~ 40 and 40 ~ 100μg / 25ml comply with the Beer’s law; its molar absorption coefficient and Sander sensitivity were 6. 8 × 10 ~ 3 and 1. 21 × 10 ~ 4l · mole ~ ( -1) · cm ~ (-1) and 0. 026 and 0. 014μg / cm ~ 2. The precision and accuracy of the method are better, the coefficient of variation of 3.2 and 4.6%, the average relative error Was 1.8 and 3.4%, respectively. Primary amine quinoline was used to detect Ce (Ⅳ), Au (Ⅲ), Cr (Ⅶ), V (Ⅴ) and IO_3 ~ ) And Au (III). This article is the continuation of a series of scientific research work, the author of the primary amine quinoline and IO_3 ~ - color reaction was studied in detail. The article reports the absorption spectrum of this color reaction, photometric determination of IO_3 ~ - the best conditions, the impact of 61 kinds of foreign ions and methods of reproducibility and recovery tests. The advantages of this method is easy to operate, better selectivity, color liquid is quite stable, precision and accuracy are good.