Italian National Reference Laboratory for Metals and Nitrogenous Compounds in food

Italian National Reference Laboratory for Metals and Nitrogenous Compounds in Food

Proficiency tests

This area contains summary information on the proficiency tests and comparative exercises organised by the Functional Area for Proficiency Tests for the Chemical Safety of Foods of the Food Safety, Nutrition and Veterinary Public Health Department, on request from the National Reference Laboratory for metals and nitrogenous compounds (NRL-MN).



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Year 2021

PVA Nitrates 2021: Determination of nitrate concentration in freeze-dried spinach. 

Test materials: freeze-dried spinach
Participants: 18 laboratories
Carried out from 6 October 2021 to 15 Februry 2022


LNR per i metalli e i composti azotati negli alimenti

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