Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 1988, Vol. 0 ›› Issue (5): 96-99.

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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

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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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