PROFICIENCY TESTING FOR AIR POLLUTION TEST LABORATORIES BY INTER-LABORATORY COMPARISON SCHEMES

The quantification of transboundary atmospheric pollutants involves measurements which, after sampling, consist in quantitative chemical analyses. In the environmental Romanian legislation there are maximum value concentration for over 100 pollutants for the atmospheric stationary emission sources and for 29 pollutants for air quality. The prove of the traceability and of the accuracy of the analyses results is made by certified reference material (CRM) use or by the inter-laboratory analysis. This issue presents the activity of Air Pollution Laboratory from INCD ECOIND concerning organisation and the co-ordination of a proficiency testing scheme for five pollutants of the atmosphere: NO2, Cl-, CN-, Co and Ni with the participation of nine laboratories. There are presented the inter-laboratory analyses results performed in nine laboratories for the certified reference materials or synthetic reference solutions prepared by INCD ECOIND followed by the statistical interpretation of the results. Calculation of 'Z-score' and the elaboration of 'The Proficiency Testing Report' which represent, for our clients and for the National Accreditation Organism in accordance with SR EN ISO/CEI 17.25:2001, the prove of the participation to this kind of activity.