Abstract
A sensitive and fast method for direct determinations of dissolved organic carbon (DOC) in bulk samples and in chromatographically separated fractions by inductively coupled plasma isotope dilution mass spectrometry (ICP−IDMS) is developed. A 13C-enriched spike solution of benzoic acid is used for the isotope dilution step. Equal ionization efficiencies are obtained for carbon, independent of the type and molecular weight of the dissolved organic substance, which is the most important precondition for DOC determinations by ICP−IDMS. The detection limits achieved are 0.3 mg L-1 for bulk analyses and 7 × 10-4 μg s-1 for transient signals of chromatographic peaks. The results for different water samples, analyzed by ICP−IDMS and a conventional DOC method, agree well within the limits of error. By using a 13C spike solution, which also contains enriched isotopes of heavy metals, simultaneous determinations of DOC and heavy metal concentrations in separated fractions of complexes with humic substances are poss...
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