Online analysis of europium and gadolinium species complexed or uncomplexed with humic acid by capillary electrophoresis-inductively coupled plasma mass spectrometry

Analytical and Bioanalytical Chemistry
Ralf KautenburgerHorst Philipp Beck

Abstract

Detailed information on the geochemical behavior of radioactive and toxic metal ions under environmental conditions (in geological matrices and aquifer systems) is needed in order to assess the long-term safety of waste repositories. This includes knowledge of the mechanisms of relevant geochemical reactions, as well as associated thermodynamic and kinetic data. Several previous studies have shown that humic acid can play an important role in the immobilization or mobilization of metal ions due to complexation and colloid formation. In our project we investigate the complexation behavior of (purified Aldrich) humic acid and its influence on the migration of the lanthanides europium and gadolinium (homologs of the actinides americium and curium) in the ternary system consisting of these heavy metals, humic acid and kaolinite (KGa-1b) under almost natural conditions. Capillary electrophoresis (CE, Beckman Coulter P/ACE MDQ), with its excellent separation performance, was hyphenated with a homemade interface to inductively coupled plasma mass spectrometry (ICP-MS, VG Elemental PlasmaQuad 3) giving a system that is highly sensitive to the rare-earth element species of europium and gadolinium with humic acid. The humic acid used was...Continue Reading

Citations

Mar 12, 2009·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Yoshinori YamaguchiKazuko Matsumoto
Jan 3, 2007·Journal of Mass Spectrometry : JMS
Mar 9, 2010·Electrophoresis·Madeleine Dell'mourStephan Hann
Sep 11, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Daniel R FröhlichPetra J Panak

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