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Development and Validation of a Method to Determine the Boron Isotopic Composition of Crop Plants
Ist Teil von
Analytical chemistry (Washington), 2011-04, Vol.83 (7), p.2562-2568
Ort / Verlag
Washington, DC: American Chemical Society
Erscheinungsjahr
2011
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We present a comprehensive chemical and mass spectrometric method to determine boron isotopic compositions of plant tissue. The method including dry ashing, a three-step ion chromatographic boron−matrix separation, and 11B/10B isotope ratio determinations using the Cs2BO2 + graphite technique has been validated using certified reference and quality control materials. The developed method is capable to determine δ11B values in plant tissue down to boron concentrations of 1 mg/kg with an expanded uncertainty of ≤1.7‰ (k = 2). The determined δ11B values reveal an enormous isotopic range of boron in plant tissues covering three-quarters of the natural terrestrial occurring variation in the boron isotopic composition. As the local environment and anthropogenic activity mainly control the boron intake of plants, the boron isotopic composition of plants can be used for food provenance studies.