偶氮胂Ⅲ分光光度法测定微量铀  

Determination of micro uranium by arsenazo Ⅲ spectrophotometry

作　　者：杜浪[1] 李玉香[1] 马雪[1] 刘永刚[2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西南科技大学分析测试中心,四川绵阳621010

出　　处：《冶金分析》2015年第1期68-71,共4页Metallurgical Analysis

基　　金：西南科技大学研究生创新基金(13ycjj15);江苏省生态环境材料重点建设实验室开放课题(EML201203);西南科技大学博士研究基金(11zx7110)

摘　　要：在0.1mol/L盐酸中,铀可与显色剂偶氮胂Ⅲ迅速反应生成蓝色络合物,据此建立了分光光度法测定微量铀的方法。通过试验确定最大吸收波长为652nm,0.1mol/L HCl的加入量为500μL,500mg/L偶氮胂Ⅲ的加入量为2.0mL。结果显示,铀的质量浓度在0-4.0mg/L范围内符合比尔定律,其线性方程为A=0.248 99ρ-0.000 1,相关系数R2=0.999 8,表观摩尔吸光系数（ε）为5.93×10^4 L·mol^-1·cm^-1。对两个含铀废液按实验方法进行测定,相对标准偏差（RSD,n=5）为0.77%和0.51%;采用电感耦合等离子体质谱法（ICP-MS）进行对照试验,结果吻合较好。In 0.1 mol/L HCl, unranium（Ⅵ） rapidly reacted with arsenazo Ⅲ chromogenic reagent and generated blue complex. Accordingly, a spectrophotometric method for the determination of micro uranium was established. Through the test, it was determined that the maximal absorbance appeared at the wavelength of 652 nm; 500 μL of 0.1 mol/L HCl and 2.0 mL of 500 mg/L arsenazo Ⅲ was selected. The results indicated that Beer＇s law was obeyed within the uranium mass concentration of 0-4.0 mg/L with the linear equation of A=0. 248 99 ρ-0,000 1 and correlation coefficient of R^2 =0. 999 8. The apparent molar absorptivity（e）was 5.93×10^4 L·mol^-1·cm^-1. Two kinds of waste water solution containing uranium were determined by proposed method, and the relative standard deviation （RSD,n=5）was 0.77% and 0.51%. Inductively coupled plasma mass spectrometry （ICP-MS） was employed for comparison experiment, and the results were consistent.

关 键 词：偶氮胂Ⅲ 铀 分光光度法 含铀废液 

分 类 号：O657.3[理学—分析化学]