The purpose of this proficiency testing programme is to assess the performance of methods used for routine measurements by commercial, public and industrial laboratories. Filters and cassettes were distributed to the laboratories in March 2000. The laboratories were asked to pre-weigh the filters prior to exposure to welding fume, and to return the prepared filter cassettes by 7th of April 2000. Welding fume filters (Series V) and synthetically produced reference filters (Series C) were distributed to the participating laboratories in May 2000. In order to determine the "true" quantities of total mass and elements on the filters, randomly selected parallel filters from each filter series were analysed at the National Institute of Occupational Health in Oslo. The reference values for Series V (welding fume) were based on the results using ICP-AES. The reference values for Series C (reference filters) were calculated and the theoretical values verified by chemical measurements. In this round of the proficiency testing programme, thirteen laboratories from England, Lithuania, Finland, Sweden and Norway have participated. Each laboratory was asked to determine a total of fourteen elements in two filter matrices (Ag, Al, Be, Cd, Co, [...]
Hjem Publikasjon Proficiency Testing for Measurement of To[...]