TY - CONF A1 - Vogl, Jochen A1 - Noordmann, J. A1 - Rosner, M. A1 - Goenaga-Infante, H. A1 - Štrok, M. A1 - Pramann, A. A1 - Vanhaecke, F. A1 - Meisel, T. A1 - Pröfrock, D. A1 - Prohaska, T. A1 - Vocke, R.D. A1 - Richter, S. T1 - Absolute Isotope Ratios N2 - Measurement results and scientific models leading to important decisions in forensics, food fraud or climatology are based on isotope ratio data. Molar masses of multi-isotopic elements are as well based on isotope ratio data. Thus, in the case of Si, isotope ratios directly impact the redefinition of the SI base units kilogram and mole. Therefore, new strategies are required leading to new primary isotope reference materials, whose isotope ratios are traceable to the SI. This in turn will ensure the comparability of isotope ratio data and will render the traceability exception requested by the CCQM superfluous. Such new procedures will be developed for the key elements S, Si, Ca, Sr and Nd at relative uncertainty levels of ≤ 0.01 %. T2 - EURAMET TC-MC Meeting CY - Vienna, Austria DA - 05.02.2018 KW - Metrology in chemistry KW - Isotope amount ratio KW - SI traceability KW - Atomic weight KW - Molar mass KW - Synthetic isotope mixtures PY - 2018 AN - OPUS4-44644 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Phukphatthanachai, Pranee A1 - Vogl, Jochen A1 - Traub, Heike A1 - Jakubwoski, Norbert A1 - Panne, Ulrich T1 - An alternative approach of using pe frits for the quantification of sulfur in copper metals and its alloys by isotope dilution LA-ICP-MS N2 - This is the first time that PE frits were used to quantify sulfur in copper and its alloys by isotope dilution combined with LA-ICP-MS: an alternative approach for sample preparation. The following properties of the PE frit meet the requirements for isotope dilution LA-ICPMS:: porous material, thermo plastic (melting point >100oC), chemical resistance (nitric acid >70%) and high adsorption efficiency. The breakthrough, however, as a support material, especially when comparing the PE frit with other materials such gelatin or sodium silicate is the low blank, which is only two times of the gas flow blank (2.3-4.0 x 104 cps). Additionally, the porosity of the frit was considered, as it directly affects the adsorption efficiency for the sample solution, which is present in the cavities of the frit. Adsorption efficiency was studied by depositing sulfur standards with varying sulfur amounts (0, 2, 5, 10, 20, 40 and 80 µg S) on the frits. The remaining sulfur which was not absorbed by the frit was rinsed off and was measured by ICP-MS. This indirect method shows that more than 99.5 % of the loaded sulfur was absorbed by the frit. Such high absorption efficiency is completely sufficient for a support material to be used in LA-ICP-IDMS. The so prepared frits whith increasing sulfur amount were measured by LA-ICP-MS showing a good linearity between 0 µg S and 40 µg S whit a correlation coefficient r2 of 0.9987 and sensitivy of 3.4x104 cpsµg-1 for 32S. Three copper reference materials produced by BAM were selected to develop and validate the LA-ICP-IDMS procedure. The IDMS technique was applied to these samples as follows: the samples were spiked, dissolved, digested and then the digest was adsorbed on the frits. T2 - Winter Conference on Plasma Spectrochemistry CY - Amelia Island, FL, USA DA - 08.01.2018 KW - Laser ablation KW - Isotope dilution mass spectrometry KW - SI traceability KW - Measurement uncertainty PY - 2018 AN - OPUS4-44642 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -