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Lead isotopic ratios (²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb) were measured on a sample of Mocs L5-6 chondritic meteorite (from the collection of meteorites of the Museum of Mineralogy of the Babeş-Bolyai University, Cluj-Napoca, Romania), using a inductively coupled plasma quadrupole mass spectrometry method. A NIST 981 standard reference material was used for calibration and control. The obtained data for the standard reference material were within the certified range; the isotopic ratio values measured for Mocs meteorite were 0.8656 ± 0.0084 for ²⁰⁷Pb/²⁰⁶Pb and 2.1011 ± 0.0036 for ²⁰⁸Pb/²⁰⁶Pb and they were compared with other chondritic meteorites. The measured total Pb content was 0.888 ± 0.005 mg/kg. Due to isobaric interferences with ²⁰⁴Hg, ²⁰⁴Pb was excluded, but further method improvement is planned to include all lead stable isotopes due to their importance to geochronology dating.

Keywords: Pb isotopes, ICP-MS, Mocs meteorite, L5-6 chondrite