TY - GEN A1 - Abad Andrade, Carlos Enrique T1 - Redefining stable isotope analysis by molecular absorption spectrometry N2 - Variations in the isotope amount composition of some elements like lithium, boron, magnesium, calcium, copper and strontium have been used as proof of provenance of a sample and to describe geological processes. Routinely, isotope compositions are determinate by mass spectrometry; the working horse of the isotope analysis. However, mass spectrometric methods are expensive, time consuming and they require a high qualified analysist. Here an alternative faster and low cost optical method for isotope ratio determination is proposed: high-resolution continuum source molecular absorption spectrometry (HR-CS-MAS). Stable isotope amount composition of X= Li, B, Mg, Ca, Cu and Sr have been determined by monitoring the absorption spectrum of their monohydride (XH) in graphite furnace HR-CS-MAS. For example, for the three Mg isotopes (24Mg, 25Mg and 26Mg) band (0→0) for the electronic transition X1Σ+ → A1Π was evaluated around wavelength 513.4 nm (Fig. 1). Partial least square regression (PLS) for analysis of samples and reference materials were applied. For this, a spectral library with different isotopes ratios for PLS regression were built. Results are metrological compatible with those reported by mass spectrometric methods. T2 - Adlershofer Forschungsforum 2017 CY - Berlin, Germany DA - 10.11.2017 KW - Isotopes KW - High-Resolution Continuum Source Molecular Absorption Spectrometry KW - HR-CS-MAS KW - Isotopic shift KW - Metal hydrides KW - Graphite furnace KW - Molecular absorption PY - 2017 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/43342 AN - OPUS4-43342 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany