首页 | 本学科首页   官方微博 | 高级检索  
     

次灵敏线火焰原子吸收光谱法测定磷酸铁锂中的锂含量
引用本文:邓翔.次灵敏线火焰原子吸收光谱法测定磷酸铁锂中的锂含量[J].中国测试技术,2013(5):46-48.
作者姓名:邓翔
作者单位:[1]四川大学生物材料工程研究中心,四川成都610064 [2]四川医疗器械生物材料和制品检验中心,四川成都610064
摘    要:以锂的次灵敏线323.3nm为分析谱线,采用火焰原子吸收光谱法测定磷酸铁锂中的高含量锂。通过研究酸介质、消电离剂和基体离子对锂测定的影响,以及进行共存离子干扰实验发现:在2%的硝酸介质中方法的灵敏度最佳;在标准溶液中加入基体离子,可以消除基体对锂测定的干扰;常见共存离子不干扰锂的测定。在优化的实验条件下,锂的检测线性范围为4—140μg·mL-1,检出限(30-)为2.0肛g·mL-1,对20.0μg·mL-1的锂标准溶液连续测定11次,其RSD为0.05%。方法简便、快速、准确,检测线性范围广,避免了稀释操作带来的误差,可用于高含量锂的直接测定;方法用于磷酸铁锂样品测定,回收率在92PTe~103.7%之间,相对标准偏差(n=7)在1.04%~1.16%之间。

关 键 词:火焰原子吸收光谱法  磷酸铁锂    次灵敏线

Flame atomic absorption spectrophotometric determination of lithium in lithium ferric phosphate using sub-sensitive spectral line
DENG Xiang.Flame atomic absorption spectrophotometric determination of lithium in lithium ferric phosphate using sub-sensitive spectral line[J].China Measurement Technology,2013(5):46-48.
Authors:DENG Xiang
Affiliation:DENG Xiang (1. Engineering Research Center in Biomaterials,Sichuan 2. Sichuan Testing Center for Biomaterials and Medical University, Chengdu 610064, China; Devices, Chengdu 610064, China)
Abstract:The high-content of lithium in lithium ferric phosphate was determined by flame atomic absorption spectrophotometry using sub-sensitive spectral line at 323.3 nm. The effects of acid medium, disionizer and matrix ions had been studied. The effects of concomitant ions had been studied too. The results proved that the sensitivity was the best in 2% HNO3 aqueous solution, and the matrix effect could be eliminating with addition of matrix ions in standard solutions. The concomitant ions did not affect the determination of lithium. Under the optimized conditions, the linearity range of lithium was kept from 4 μg.mL-1 to 140 μg.mL-1 and the detection limit(3σ)was 2.0μg.mL-1. The relative standard deviation (n=11) was 0.05% for 20.0 g·mL-1 lithium. This was a simple, rapid, accurate method with wide linearity range. It could avoid the error produced in the dilution operation, so it could be applied to determine high-content lithium in samples directly. The content of lithium in lithium ferric phosphate was determined by this method, giving values of recovery in the range of 94%-103.7% and RSD (n=7) in the range of 1.04%-1.16%.
Keywords:flame atomic absorption spectrophotometry  lithium ferric phosphate  lithium  subsensitive spectral line
本文献已被 维普 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号