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Title: Spectrophotometric determination of uranium through uranyl/azide system

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.
Authors:
;  [1] ;  [2]
  1. FFCLRP-USP, Ribeirao Preto (Brazil)
  2. UFPR, Curitiba (Brazil)
Publication Date:
OSTI Identifier:
217953
Resource Type:
Journal Article
Resource Relation:
Journal Name: Analytical Letters; Journal Volume: 28; Journal Issue: 10; Other Information: PBD: Jul 1995
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; URANINITES; SPECTROPHOTOMETRY; QUANTITATIVE CHEMICAL ANALYSIS; URANIUM COMPLEXES; STABILITY; ACCURACY; SPECTROSCOPIC FACTORS; AZIDES; INTERFERING ELEMENTS