分光光度法测定氢氧化稀土中微量硝酸根含量的研究  

Research on Determination of Trace Nitrate in Rare Earth Hydroxides by Spectrophotometry

作　　者：易师 刘荣丽 邹龙 

机构地区：[1]湖南稀土金属材料研究院,湖南长沙410126

出　　处：《稀有金属与硬质合金》2015年第5期72-74,共3页Rare Metals and Cemented Carbides

摘　　要：以靛蓝二磺酸钠为显色剂,采用分光光度法测定氢氧化稀土中微量硝酸根的含量,探讨了不同因素对硝酸根测定的影响,确定了最佳分析条件。当硝酸根的质量浓度为0~1.0μg/mL时,溶液褪色程度与硝酸根含量呈线性关系,符合朗伯-比尔定律。硝酸根测得值的相对标准偏差为2.41%,加标回收率为97.6%~101.3%。本方法操作简单,检测结果准确。Trace nitrate in rare earth hydroxides was determined by spectrophotometry with indigo carmine as the chromogenic reagent.The influence was investigated of different factors on nitrate determination,and the optimum analytical conditions were determined.When nitrate concentration is 0~1.0μg/mL,there is a linear relationship between color fading degree and nitrate content following Beer's law.The relative standard deviation of the measured nitrate content is 2.41%,and the standard addition recovery is 97.6%~101.3%.This method to determine trace nitrate in rare earth hydroxides is characterized by simple operation and accurate test results.

关 键 词：氢氧化稀土 硝酸根测定 分光光度法 靛蓝二磺酸钠 

分 类 号：TQ133.3[化学工程—无机化工] O657.3[理学—分析化学]