分光光度法测定微量溴酸根的研究

Study on the Determination of BrO_3^- by Spectrophotometric Method

提出了测定微量溴酸根的新方法。研究了在盐酸介质中，溴酸根氧化二甲酚橙褪色的最佳条件，最大吸收波长λmax为430nm。表观摩尔吸光系数为2．5×104L.mol-1．cm－1，溴酸根量在10～50μg/25ml范围内服从比耳定律。可用于溴化物试剂中微量溴酸根的测定，相对标准偏差分别为3．0％和2．7％。

A new spectrophotmetric method of the determination of trace BrO3 was investigatedIn hydrochloric acid medium, the best experiment condition for BrO3 oxidizing XO to decoIourXO was established. There is a maximum absorbance at 430nm, and the observed molar absorptivi-ty is 2. 5 ×104 L. mol- 1. cm- 1, and corresponding with Beer's law in the range of BrO3 10 ~50μg/25ml. This method can be used to determine trace Bro3 in chemical reagents with satisfac-tory results.