Dear Andrés, I know that "Food analysis using Isotopic Techniques" (FIT-PTS) proficiency scheme complies with the ISO/IUPAC/AOAC International Harmonised Protocol for Proficiency Testing of analytical laboratories and is dedicated to the isotopic analysis (including deuterium and oxygen 18 in liquid water samples). For further information and details regarding the proficiency testing scheme, please contact: [log in to unmask] Best regards, PhD chemist Oana BOTORAN National R&D Institute for Cryogenic and Isotopic Technologies ICSI Rm. Valcea, Romania Uzinei Street, No 4 Zip Code 240050 PO Raureni PO BOX 7 Phone: 004.0250.732.744, int. 131 Fax: 004.0250.732.746 E-mail: [log in to unmask]<mailto:[log in to unmask]> <mailto:[log in to unmask]> ________________________________ De la: Stable Isotope Geochemistry <[log in to unmask]> în numele Andrés Felipe Porras <[log in to unmask]> Trimis: marți, 9 iulie 2019 13:14:52 Către: [log in to unmask] Subiect: [ISOGEOCHEM] Water stable isotopes worldwide intercomparison Hi isogeochemists. Do any of you know of any worldwide provider of proficiency tests for isotopic relations in deuterium and oxygen 18 in liquid water? I know the wico program of the IAEA, but I need one with ISO 17043 certificate and I found that, although wico performs the test very well, it does not have this accreditation. Thanks for the attention.