Spectrophotometric determination of uranium through uranyl/azide system

Journal Article · Sat Jul 01 04:00:00 EDT 1995 · Analytical Letters

DOI:https://doi.org/10.1080/00032719508000365· OSTI ID:217953

Carmo, D.R. do; Andrade, J.F. de ^[1]; Guimaraes, O M ^[2]

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1. FFCLRP-USP, Ribeirao Preto (Brazil)
2. UFPR, Curitiba (Brazil)

An alternative method for the determination of uranium has been established by spectrophotometry. The procedure is based on the products of reaction between uranyl and azide ions (excess). This system furnishes yellowish complexes and the reaction was explored in water-acetonitrile medium (60% v/v), at 311 m. The resulting solution has a good stability and precision of measurements about 0.4% (standard deviation). The system obeys the Beer`s law over concentration range from 5.0 to 40 ppm. The molar absorptivity and Sandell`s sensitivity of the complexes are 9.23 x 10{sup 3} 1 mol{sup -1}cm{sup -1} and 0.0292 {mu}g cm{sup -2}, respectively. Effect of some diverse ions has been studied and several anions and cations do not interfere. The method was tested for a natural sample (uraninite), after different carbonate treatments. The results for uranium were compared with a conventional spectrophotometric (arsenazo) and inductively coupled plasma (ICP) methods. The possibility of the simultaneous spectrophotometric determination of uranium(VI) and iron(III) was also verified. This methodology showed good accuracy, precision, selectivity and simplicity.

• Sponsoring Organization: USDOE
• OSTI ID: 217953
• Journal Information: Analytical Letters, Journal Name: Analytical Letters Journal Issue: 10 Vol. 28; ISSN ANALBP; ISSN 0003-2719
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ACCURACY
AZIDES
INTERFERING ELEMENTS
QUANTITATIVE CHEMICAL ANALYSIS
SPECTROPHOTOMETRY
SPECTROSCOPIC FACTORS
STABILITY
URANINITES
URANIUM COMPLEXES