Determination of boron traces in rye grass BCR 281 by isotope dilution mass spectrometry

Summary A method for the isotope dilution mass spectrometric (IDMS) determination of boron in rye grass at the 5 g · g^–1 level has been developed. The mass spectrometric measurements are performed using negative thermal ionization at masses 42 (¹⁰B¹⁶O¹⁶O^–) and 43 (¹¹B¹⁶O¹⁶O^–). The ¹⁰B/¹¹B ratios are corrected for the ¹⁰B¹⁶O¹⁷O^– contribution at mass 43 and for mass fractionation. The chemical blank is determined using the standard addition method. The numerical calculations are done with a least square fit computer program. The method has been applied for the certification of boron in BCR 281 (Rye Grass). The boron content of this reference material has been established as (5.64±0.56) g·g^–1.

---

Bestimmung von Borspuren in Rye Grass BCR 281 durch Isotopenverdünnungs-Massenspektrometrie