TY - JOUR A1 - Rosner, Martin T1 - Geochemical and instrumental fundamentals for accurate and precise strontium isotope data of food samples: comment on "determination of the strontium isotope ration by ICP-MS ginseng as a tracer of regional origin" (Choi et al., 2008) T2 - Food chemistry N2 - The strontium isotope composition of food samples has been successfully used to trace the provenance of both herbal and animal agricultural products. Adequately accurate and precise 87Sr/86Sr ratios, however, are key to unravel environmental and anthropogenic strontium contributions of specific growing areas. In a recently published analytical method in Food Chemistry by Choi et al. (2008) a demonstrably inadequate protocol for the determination of 87Sr/86Sr ratios of ginseng is presented. Based on well established geological and analytical fundamentals the 87Sr/86Sr ratios presented by Choi et al. (2008) are too inaccurate and imprecise to be used to trace the origin of the ginseng. Appropriate wet chemical separation techniques and mass spectrometric instrumentation enables the generation of 87Sr/86Sr data with very low expanded uncertainties (<0.05%, k = 2). Those high quality data allow the identification of even small strontium contributions of source reservoirs or physical and anthropogenic processes if diagnostic isotope compositions are present. PB - Elsevier CY - Amsterdam [u.a.] ; Jena KW - Strontium isotopes KW - Food provenance studies KW - TIMS KW - ICP-MS KW - Analytical accuracy KW - Mass spectrometry PY - 2010 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/21325 AN - OPUS4-21325 SN - 0308-8146 VL - 121 IS - 3 SP - 918 EP - 921 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany