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Spectrophotometric Determination of Uranium with 1-(2-Pyridylazo)-2-naphthol

Journal Article · · Analytical Chemistry
DOI:https://doi.org/10.1021/ac60143a019· OSTI ID:4286244

From 40 to 400 gamma of uranium can be determined by extraction of uranyl nitrate into a tributyl phosphatechloroform solvent and subsequent color development in the organic extract with 1-(2-pyridylazo)-2-naphthol (PAN) in the presence of pyridine. The disodium salt of (ethylenedinitrilo)tetraacetic acid increased the selectivity of uranium extraction by chelating zirconium, bismuth, and manganese(II). Thorium is removed as thorium oxalate prior to extraction. Synthetic solutions containing uranium and 37 diverse ions were analyzed by the PAN and fluorometric procedures. The PAN procedure gave an average uranium recovery of 99% and an average deviation of plus or minus 2%. The fluorometric procedure gave an average recovery of 98% and an average deviation of plus or minus 4%. Analyses of alloys, ores, and organic extracts by the PAN and fluorometric methods are reported.

Research Organization:
Dow Chemical Co., Midland, Mich.
Sponsoring Organization:
USDOE
NSA Number:
NSA-13-001154
OSTI ID:
4286244
Journal Information:
Analytical Chemistry, Journal Name: Analytical Chemistry Journal Issue: 11 Vol. 30; ISSN 0003-2700
Publisher:
American Chemical Society (ACS)
Country of Publication:
Country unknown/Code not available
Language:
English