高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (8): 850.

• 论文 • 上一篇    下一篇

导数光谱法快速测定混合稀土中的钕

邹时复, 李中   

  1. 山东大学化学系
  • 收稿日期:1987-01-08 出版日期:1988-08-24 发布日期:1988-08-24
  • 通讯作者: 邹时复

Quick Determination of Neodymium in Mixtures of Rare Earths by Derivative Spectrophotometric Method

Zhou Shifu, Li Zhong   

  1. Department of Chemistry, Shandong University, Jinan
  • Received:1987-01-08 Online:1988-08-24 Published:1988-08-24

摘要: 光度法单一稀土的测定主要依靠4/电子的跃迁及其受配位场或环境影响后的超灵敏光谱[1~6],钕与钛铁试剂络合后使其特征峰增强约4倍[2]可用于测定钕。我们发现此络合物在紫外区尚有二强吸收峰,镧、铈、错、钕、钐、钇的峰位均相同,且摩尔吸光系数很接近,因而可用以代替称量测定总稀土(在255nm)。为提高灵敏度与消除干扰,我们用其三阶导数光谱测钕。据此拟定的快速测定钕法曾试用于合成样及实物,均获得满意的结果。

关键词: 稀土, 钕, 导数光谱

Abstract: It is known that the Neodymium Tiron complex has a characteristic abso-rption (578nm) which can be used to determine Nd. If derivative spectrum is used to replace common spectrophotometry, interferences of Ce and Pr can be avoided. The authors have found the other two strong absorption peaks (255nm> 310nm) possessed by rare earths in ultraviolet region. The peak (255nm) has no selectivity but lies at the same wavelength and the molar absorbance coefficient e is a very near thing on all rare earth elements. Thus this peak can be used to determine the total amount of rareearth. Based on this, we measured it at two wavelengths (578nm and 255nm). As a result, a non-weighing derivative spectrophotometric methodfor quick determination of Nd, in mixtures of Rare Earths is established by us.This method has been used in three synthesizing samples and a real sample. Theresults obtained are qutie satisfactory.

Key words: Neodymium, Rare earths, Derivative spectrophotometric

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