甲基橙-溴酸钾体系催化褪色光度法测定痕量铜  

Spectrophotometric Determination of Trace Copper with Methyl Orange-Potassium Bromate

作　　者：夏琼 

机构地区：[1]安化县渣滓溪矿业有限公司,湖南安化413500

出　　处：《邵阳学院学报（自然科学版）》2013年第4期49-53,共5页Journal of Shaoyang University：Natural Science Edition

摘　　要：利用铜对甲基橙一溴酸钾体系的催化作用，建立一种新的测定痕量铜的方法，并利用该方法测定样品中铜的含量．方法：采用分光光度法进行实验，利用单因素法确定该催化反应的适宜条件，运用加标回收法和平行实验确定该方法的准确度和精密度．结果：通过探究，该褪色反应的适宜条件是：9n,4定波长为508nm，0．0002tool／L的甲基橙5．00ml，0．005tool／L的溴酸钾0．50ml，2mol／L的硝酸2．00ml；50℃下反应时间15rain．该方法的线性范围为0．2mg／L到16mg／L，线性方程为△A=0．0508＋0．0664c，相关系数为0．9979，相对标准偏差为1．3％，样品加标回收率为97．5％～112．8％，结果满意．Using the catalytic action on methyl orange -potassium bromate system by copper, a new method to determine the trace copper was established, and then the method was applied to determine copper in the sample, nethods：Spectrophotometric was used for the experiment, the single factor method was used to determine the optimum conditions for the catalytic reaction, the standard addition method and the parallel recovery experiment were applied to determine the accuracy and precision. Results：The maximum absorption wavelength was 508nm ;The concentration and dosage of methyl orange were 0. 0002mol/L and 5.00ml;The coneentratioll and dosage of potassium bromate were 0. 005mol/L and 0.50ml; The concentration and dosage of nitric acid were 2mol/L and 2.00ml ;The reaction time should be 15min when the temperature was 50℃. The linear range varied from 0.2mg/L to 16mg/L,the linear equation was AA = 0. 0508 ＋0. 0664c, the correlation coefficient was 0. 9979;The relative standard deviationwas 1.3% ;The recovery for the sample was 97.5% -112.8%.

关 键 词：甲基橙 溴酸钾 铜 单因素法 催化褪色光度法 

分 类 号：O657.3[理学—分析化学]