中华医学超声杂志

应用化学 ›› 1988, Vol. 0 ›› Issue (5): 96-99.

• 研究简报 • 上一篇    

磷酸三丁酯萃取原子吸收光谱法测定微量Cr(Ⅲ)和Cr(Ⅵ)

侯永根1, 王余明1, 迟锡增2   

  1. 1. 南京师范大学化学系;
    2. 北京师范大学化学系
  • 收稿日期:1987-10-26 修回日期:1988-03-12 出版日期:1988-10-10 发布日期:1988-10-10

TRACE DETERMINATION OF CHROMIUM(Ⅲ)AND CHROMIUM(Ⅵ)BY EXTRACTION WITH TRI-n-BUTYLPHOSPHATE AND ATOMIC ABSORPTION SPECTROPHOTOMETRY

Hou Yonggen1, Wang Yuming1, Chi Xizeng2   

  1. 1. Department of Chemistry, Nanjing Normal University;
    2. Department of Chemistry, Beiiing Normal University
  • Received:1987-10-26 Revised:1988-03-12 Published:1988-10-10 Online:1988-10-10

PDF

532

被引次数

3

摘要： 常用的 APDC-MIBK[1,2]和 DDTC-MIBK[3,4]萃取原子吸收法一般只能测至十几个ppb 浓度的铬,且需在较高温度下进行萃取.本文报道一种用磷酸三丁酯(TBP)萃取原子吸收光谱法测定微量 Cr(Ⅲ)和 Cr(Ⅵ)的方法.实验表明,Cr2O7在盐酸介质中可与 TBP 形成 Cr(Ⅵ)-TBP-Cl-溶剂化合物,借此可测定0-0.25μg·ml-1浓度范围内的 Cr(Ⅵ).若用 KMnO4将平行试样中的 Cr(Ⅲ)氧化为 Cr(Ⅵ),测得总铬量,通过差减法即可算出Cr(Ⅲ)的含量.本法灵敏度高,准确度好.

关键词: 铬离子, 原子吸收光谱法, 痕量分析

Abstract: A sensitive and accurate method for trace determination of Cr(Ⅲ)as well as Cr(Ⅵ) is proposed in which Cr(Ⅵ) is extracted by tri-n-butylphosphate(TBP)and analyzed by flame atomic absorption spectrophotometry.The presence of Cr(Ⅲ),with its concentration up to 500-fold to Cr(Ⅵ),does not affect the result.In the method,Cr(Ⅲ)is oxidized to Cr(Ⅵ)by KMnO4 at 100℃ in H2SO4 solution using CO(NH2)2 as a protection agent, and then determined by subtraction of the original Cr(Ⅵ)content from the total Cr (Ⅵ)content.Samples of drinking water and water from Huang-Pu River were determined for Cr(Ⅲ)and Cr(Ⅵ).The results was satisfied,It is considered that the sensitivity of the method lies on the formation of a solvation compound Cr(Ⅵ)-TBP-Cl-.

Key words: Chromium ion, Trace analysis, Atomic absorption spectrophtometry

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