Distribution coefficients of 60 elements on TODGA resin

Application to Ca, Lu, Hf, U and Th isotope geochemistry

Ali Pourmand, Nicolas Dauphas

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Batch equilibration experiments are conducted to measure the distribution coefficients (Kd) of a large number of elements in nitric, nitric plus hydrofluoric, and hydrochloric acids on Eichrom TODGA extraction chromatography resin. The Kds are used to devise a multi-element extraction scheme for high-precision elemental and isotopic analyses of Ca, Hf, Lu, Th and U in geological materials, using high-purity lithium metaborate (LiBO2) flux fusion that allows rapid digestion of even the most refractory materials. The fusion melt, dissolved in nitric acid, is directly loaded to a TODGA cartridge on a vacuum chamber for elemental separation. An Ln-Spec cartridge is used in tandem with TODGA for Lu purification. The entire procedure, from flux digestion to preparation for isotopic analysis, can be completed in a day. The accuracy of the proposed technique is tested by measuring the concentrations of Ca (standard bracketing), Hf, Lu, Th and U (isotope dilution), and the isotopic composition of Hf in geostandards (USNM3529, BCR-2, BHVO-1, AGV-1 and AGV-2). All measurements are in excellent agreement with recommended literature values, demonstrating the effectiveness of the proposed analytical procedure and the versatility of TODGA resin.

Original languageEnglish (US)
Pages (from-to)741-753
Number of pages13
JournalTalanta
Volume81
Issue number3
DOIs
StatePublished - May 15 2010
Externally publishedYes

Fingerprint

Geochemistry
Isotopes
Digestion
Fusion reactions
Resins
Fluxes
Hydrofluoric Acid
Nitric Acid
Hydrochloric Acid
Nitric acid
Vacuum
Chromatography
Lithium
Refractory materials
Dilution
Purification
Chemical analysis
Experiments

Keywords

  • Distribution coefficient
  • Extraction chromatography
  • Flux fusion
  • Lu-Hf
  • TODGA
  • U-Th

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Distribution coefficients of 60 elements on TODGA resin : Application to Ca, Lu, Hf, U and Th isotope geochemistry. / Pourmand, Ali; Dauphas, Nicolas.

In: Talanta, Vol. 81, No. 3, 15.05.2010, p. 741-753.

Research output: Contribution to journalArticle

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