溴酸钾-邻氨基酚体系催化动力学光度法测定微量铁  

Determination of Trace Iron by Catalytic Kinetic Spectrophotometry with Potassium Bromate-o-Aminophenol System

作　　者：韦文业 

机构地区：[1]广西现代职业技术学院资源工程系,河池547000

出　　处：《理化检验（化学分册）》2017年第12期1412-1415,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在pH 2.5的乙酸-乙酸钠缓冲溶液的介质中,Fe(Ⅲ)催化溴酸钾氧化邻氨基酚显色,据此建立了测定微量铁的分光光度法。测定波长为406nm,反应温度为80℃,反应时间为10min。Fe(Ⅲ)质量浓度在0.25~4.0mg·L^(-1)内与吸光度呈线性关系,检出限(3s/k)为0.011mg·L^(-1)。方法用于测定工业硫酸锌中微量铁的含量,加标回收率在102%~108%之间,测定值的相对标准偏差(n=6)为3.6%。In the medium of acetic-sodium acetate buffer solution（pH 2.5）,Fe（Ⅲ）catalyzed the oxidation of o-aminophenol by potassium bromate and made coloration.Based on this fact,a method for determination of trace iron by spectrophotometry was established.The determination wavelength was 406 nm,the reaction temperature was 80 ℃,and the reaction time was 10 min.Linear relationship was found between the absorbance and the mass concentration of Fe（Ⅲ）in the range of 0.25-4.0 mg·L^（-1）,with detection limit（3 s/k）of 0.011 mg·L^（-1）.The poposed method was used for the determination of trace iron content in industrial grade zinc sulfat,giving recovery rates obtained by standard addition method in the range of 102%-108% and RSDs（n=6）of 3.6%.

关 键 词：催化动力学光度法 铁 溴酸钾 邻氨基酚 

分 类 号：O657.32[理学—分析化学]