Separation of Boron Stable Isotope by Ion Exchange Chromatography using cascade system and obtaining of H310BO3 enriched in 10B

Author(s)

Ana Carolina Ribeiro Granja

• Document type: Doctoral Thesis
• Press: Piracicaba.
• Institution: Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura (CENA/STB)
• Defense date: 2013-11-08

Examining board members

Jose Albertino Bendassolli; Rodrigo Marcelli Boaretto; Juliana Célia Denadai; Jorge Eduardo de Souza Sarkis

• Advisor: Jose Albertino Bendassolli

Abstract

The chromatographic method of ion exchange resin in columns was used to study the isotopic enrichment of 10B and H3 10BO3. In two column chromatographic systems (S1: six acrylic columns 1800 mm length and 70 mm diameter; S2: six acrylic columns 1800 mm length and 30 mm diameter) was studied 10B isotope separation in equilibrium involving aqueous boric acid and borate ions adsorbed on anionic resin of the quaternary ammonium type (Dowex 1X8) 100-200 \"mesh\". The production systems H3 10BO3 were evaluated individually and in cascade process with 10B transfer between both systems. The measurements of B in this study were evaluated by Inductively Coupled Plasma Mass Spectrometry and Thermal Ionization Mass Spectrometry. In the S1 columns system displacement after 243 m (135 DBC) was possible obtain an medium enrichment in the last 20 cm, of 40 % atoms 10B, corresponding to 2830 mg of H310BO3. This mass was transferred to the S2 column system which have introduced in the last 20 cm of the band medium enrichment of 47,8 atom% 10B and this new band chromatography was displaced 21,6 m, thus obtaining the last centimeter band (1-0 cm) from enriched fraction 82 % atoms 10B. The fractionation factor (\'alfa\') and the Height Equivalent of Theoretical Plate (HETP) of stable isotopes of B (10B and 11B) was determined like being 1,0245 and 0,30 cm, respectively (AU)

• FAPESP's process: 09/01364-0 - Boron Stable Isotope Separation by Ion Exchange Chromatography, for system cascade in the obtaining of H310BO3 enriched in 10B.
• Grantee: Ana Carolina Ribeiro Granja
• Support Opportunities: Scholarships in Brazil - Doctorate