碱熔解-硫脲比色法快速测定钌碳催化剂中的钌

Rapid Determination of Ruthenium in Ruthenium Carbon Catalyzer Using Alkali Fusing-Thiourea Colorimetry

建立了碱熔解-硫脲比色法快速测定钌碳催化剂中钌的方法;对样品的预处理和显色条件进行了改进,将精密度和准确度与传统法的进行了比较。结果表明：采用过氧化钠熔解钌、盐酸转化试液、在4 mol/L盐酸介质中和60~80℃水浴保持10m in后,可较好的进行硫脲比色法测定钌;本法和传统法测得钌的质量分数和相对标准偏差分别为4.30%、4.30%和1.02%、1.21%,本法测得样品加标准回收率为98.01%~102.12%;2种方法分析结果的精密度和准确度吻合,但本法快速、简便,满足日常样品的分析要求。方法已应用于废钌碳催化剂中钌的测定。

A method for rapid determination of ruthenium in ruthenium carbon catalyzer using alkali fusing-thiourea colorimetry was established.The conditions of pretreatment and color for sample were improved.The proposed method was compared with traditional method on precision and accuracy.Results indicated that the ruthenium was better determinated using fusing with Na2O2,hydrochloric acid translating sample solution,4 mol/L hydrochloric acid medium and 60～80℃ water bathing for 10min.The content and relative standard deviation of ruthenium are 4.30%,4.30% and 1.02%,1.21%,respectively,with proposed method and traditional method.The recovery of Ru in adding standard ruthenium sample is 98.01%～102.12% with proposed method.The precision and accuracy of analytical results are almost the same for two methods.However,the proposed method is rapid,easy to operate,and could meet the requests for sample analysis.It was applied for the determination of Ru in ruthenium carbon catalyzer.