Abstract. In June 2009, the Laboratory in hydrology of Nancy (Ansès-LHN, Nancy) conducted an exploratory inter-laboratory proficiency tests (ILT) test in collaboration with the AQUAREF network to identify laboratory practices and estimate inter-laboratory uncertainty for the compounds under study. There were a total of 12 compounds belonging to six families (hormones, antibiotics, non-steroidal antiinflammatory drugs, beta blockers, antipsychotics and others) including one compound used in veterinary medicine. It was the first ILT conducted in France on water intended for human consumption. Thirty-one laboratories participated, 4 of which were located abroad.
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