Jump to main content
Jump to site search

Issue 9, 2011
Previous Article Next Article

Controlling the mass bias introduced by anionic and organic matrices in silicon isotopic measurements by MC-ICP-MS

Author affiliations

Abstract

One of the most widely used sample preparation methods for Si isotopic analyses (δ30Si and δ29Si) is based on cationic chromatography, which does not remove anions from samples. Although it was first thought that the presence of anions in natural concentrations does not distort the isotopic analyses, it has recently been shown that the presence of sulfate can induce a significant shift in isotopic ratio measurements above SO42/Si ratios (wt) of 0.02. Here, we show that dissolved organic matter can also induce a major Si isotopic bias when analysing river waters. To overcome these non-spectral matrix effects we propose fast and reliable ways, tested on natural freshwater and rock digestion solutions. The sulfate matrix effect is solved by adding to both sample and bracketing standard sulfuric acid in large excess compared to the naturally occurring SO42. The organic matrix is mineralized by the combined action of UV-C and ozone. We also provide the first δ30Si signature measurements of two common geostandards: SGR-1 (δ30Si = +0.03‰) and FeR-1 (δ30Si = −0.20‰).

Graphical abstract: Controlling the mass bias introduced by anionic and organic matrices in silicon isotopic measurements by MC-ICP-MS

Back to tab navigation

Publication details

The article was received on 24 Mar 2011, accepted on 12 May 2011 and first published on 06 Jun 2011


Article type: Technical Note
DOI: 10.1039/C1JA10110B
Citation: J. Anal. At. Spectrom., 2011,26, 1892-1896
  •   Request permissions

    Controlling the mass bias introduced by anionic and organic matrices in silicon isotopic measurements by MC-ICP-MS

    H. J. Hughes, C. Delvigne, M. Korntheuer, J. de Jong, L. André and D. Cardinal, J. Anal. At. Spectrom., 2011, 26, 1892
    DOI: 10.1039/C1JA10110B

Search articles by author

Spotlight

Advertisements