亚硝基R盐分光光度法测定镁合金中铜和铁  

Spectrophotometric determination of copper and iron in magnesium alloy with nitroso-R-salt

作　　者：邱会东[1] 昝陆军 兰伟[1] 杨治立[1] 申鹏飞[1] 封炜涛[1] 

机构地区：[1]重庆科技学院化学化工学院,重庆400050 [2]西安市市政工程管理处,陕西西安710003

出　　处：《冶金分析》2008年第4期70-72,共3页Metallurgical Analysis

基　　金：重庆市教委自然科学基金项目(KJ071408)

摘　　要：建立镁合金中杂质铜、铁元素含量的分光光度测定方法。在酸性体系中，铜和铁与亚硝基R盐分别形成黄绿色络合物，其中λmax（Cu）=450nm，λmax（Fe）=720nm，铜、铁络合物的表观摩尔吸光系数分别为1.1×10^4L·mol^-1·cm^-1，0.7×10^4L·mol^-1·cm^-1。铜、铁的质量浓度分别在0．2-12μg／ml，和0．1-16μg／mL时工作曲线呈线性。方法用于镁合金中铜和铁的测定，相对标准偏差为2．06%-3．25％，结果同原子吸收光谱法的测定结果吻合。A spectrophotometric method for the determination of copper and iron in magnesium alloy was established in this study. In acid system, copper and iron could react with nitroso-R-salt to form a yellow green complex with λmax（Cu）=450 nm and λmax（Fe） =720 nm. The apparent molar absorptivity of copper and iron complexes were 1.1×10^4L·mol^-1·cm^-1 and 0.7×10^4L·mol^-1·cm^-1, respectively. The calibration curve was linear over the range of 0.2-12μg/mL and 0.1-16μg/mL for copper and iron respectively. The method has been applied to the determination of copper and iron in magnesium alloy with the relative standard deviation of 2.06%-3.25%. The results are accordant with those obtained by AAS.

关 键 词：镁合金 铜 铁 亚硝基R盐 分光光度法 

分 类 号：TG115.3[金属学及工艺—物理冶金]