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Title: Extraction chromatographic separations of tantalum and tungsten from hafnium and complex matrix constituents

Abstract

Ta, Hf, and W analyses from complex matrices (including environmental samples) require high purification of these analytes from each other and major/trace matrix constituents, however, current state-of-the-art Ta/Hf/W separations rely on traditional anion exchange approaches that suffer from relatively similar distribution coefficient (Kd) values for these analytes. This work reports assessment of three commercially available extraction chromatographic resins (TEVA, TRU, and UTEVA) for Ta/Hf/W separations. Batch contact studies show differences in Ta/W,Hf Kd values of up to 106, representing an improvement of a factor of 100 and 300 in Ta/Hf and Ta/W Kd values (respectively) over AG1x4 resin. Variations in the Kd values as a function of HCl concentration for TRU resin show that this resin is well suited for Ta/Hf/W separations, with Ta/Hf, Ta/W, and W/Hf Kd value improvements of 10, 200, and 30 (respectively) over AG1x4 resin. Finally, analyses of digested soil samples (NIST 2710a) using TRU resin and tandem TEVA-TRU columns demonstrate the ability to achieve extremely high purification (>99%) of Ta and W from each other and Hf, as well as enabling very high purification of Ta and W from the major and trace elemental constituents present in soils, using a single chromatographic step.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1344044
Report Number(s):
PNNL-SA-118586
Journal ID: ISSN 0021-9673; DN2003000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chromatography; Journal Volume: 1484; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Snow, Mathew S., Finck, Martha R., Carney, Kevin P., and Morrison, Samuel S.. Extraction chromatographic separations of tantalum and tungsten from hafnium and complex matrix constituents. United States: N. p., 2017. Web. doi:10.1016/j.chroma.2017.01.019.
Snow, Mathew S., Finck, Martha R., Carney, Kevin P., & Morrison, Samuel S.. Extraction chromatographic separations of tantalum and tungsten from hafnium and complex matrix constituents. United States. doi:10.1016/j.chroma.2017.01.019.
Snow, Mathew S., Finck, Martha R., Carney, Kevin P., and Morrison, Samuel S.. Wed . "Extraction chromatographic separations of tantalum and tungsten from hafnium and complex matrix constituents". United States. doi:10.1016/j.chroma.2017.01.019.
@article{osti_1344044,
title = {Extraction chromatographic separations of tantalum and tungsten from hafnium and complex matrix constituents},
author = {Snow, Mathew S. and Finck, Martha R. and Carney, Kevin P. and Morrison, Samuel S.},
abstractNote = {Ta, Hf, and W analyses from complex matrices (including environmental samples) require high purification of these analytes from each other and major/trace matrix constituents, however, current state-of-the-art Ta/Hf/W separations rely on traditional anion exchange approaches that suffer from relatively similar distribution coefficient (Kd) values for these analytes. This work reports assessment of three commercially available extraction chromatographic resins (TEVA, TRU, and UTEVA) for Ta/Hf/W separations. Batch contact studies show differences in Ta/W,Hf Kd values of up to 106, representing an improvement of a factor of 100 and 300 in Ta/Hf and Ta/W Kd values (respectively) over AG1x4 resin. Variations in the Kd values as a function of HCl concentration for TRU resin show that this resin is well suited for Ta/Hf/W separations, with Ta/Hf, Ta/W, and W/Hf Kd value improvements of 10, 200, and 30 (respectively) over AG1x4 resin. Finally, analyses of digested soil samples (NIST 2710a) using TRU resin and tandem TEVA-TRU columns demonstrate the ability to achieve extremely high purification (>99%) of Ta and W from each other and Hf, as well as enabling very high purification of Ta and W from the major and trace elemental constituents present in soils, using a single chromatographic step.},
doi = {10.1016/j.chroma.2017.01.019},
journal = {Journal of Chromatography},
number = C,
volume = 1484,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}