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The present work describes the development of an existing TIMS procedure to a reference procedure for low sulfur concentration measurements in fossil fuels. With this enhanced procedure SI-traceable sulfur mass fractions below 10 mg kg-1 can be obtained. The achieved detection limit is approximately 0.2 mg kg-1. The procedure was validated by certified reference materials. The procedure was already applied to candidate reference materials and to samples analysed within projects of the Comité Consultatif pour la Quantité de Matière CCQM.
Additionally the influence of the isotopic composition on the results and its corresponding uncertainty was studied. Reference data published in the literature on the isotopic composition of sulfur were assessed.