TY - JOUR A1 - Vogl, Jochen A1 - Paz, B. A1 - Koenig, Maren A1 - Pritzkow, Wolfgang T1 - A modified lead-matrix separation procedure shown for lead isotope analysis in Trojan silver artefacts as an example T2 - Analytical and bioanalytical chemistry N2 - A modified Pb–matrix separation procedure using NH4HCO3 solution as eluent has been developed and validated for determination of Pb isotope amount ratios by thermal ionization mass spectrometry. The procedure is based on chromatographic separation using the Pb·Spec resin and an in-house-prepared NH4HCO3 solution serving as eluent. The advantages of this eluent are low Pb blanks (<40 pgmL-1) and the property that NH4HCO3 can be easily removed by use of a heating step (>60 °C). Pb recovery is >95 % for water samples. For archaeological silver samples, however, the Pb recovery is reduced to approximately 50 %, but causes no bias in the determination of Pb isotope amount ratios. The validated procedure was used to determine lead isotope amount ratios in Trojan silver artefacts with expanded uncertainties (k=2) <0.09 %. PB - Springer CY - Berlin KW - Analyte-matrix separation KW - Mass spectrometry KW - Pb isotope ratio thermal ionization mass spectrometry KW - Archaeometry PY - 2013 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/28170 AN - OPUS4-28170 SN - 1618-2642 SN - 1618-2650 VL - 405 IS - 9 SP - 2995 EP - 3000 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany