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Citation: Hou Yonggen, Wang Yuming, Chi Xizeng. TRACE DETERMINATION OF CHROMIUM(Ⅲ) AND CHROMIUM(Ⅵ) BY EXTRACTION WITH TRI-n-BUTYLPHOSPHATE AND ATOMIC ABSORPTION SPECTROPHOTOMETRY[J]. Chinese Journal of Applied Chemistry, ;1988, 5(5): 96-99. shu

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

1.
1. Department of Chemistry, Nanjing Normal University;
2.
2. Department of Chemistry, Beiiing Normal University

Received Date: 26 October 1987
Available Online: 12 March 1988

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^-.
- Chromium ion,
- Trace analysis,
- Atomic absorption spectrophtometry
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