Second European Quality Assurance Programme for Sulphur Dioxide and Suspended Particulates Measurements
27 measuring stations of Community member states, visited by a JRC mobile laboratory, carried out routine monitoring of SO(2), black smoke and suspended particulates in parallel with a comparison instrument. This was calibrated in the mobile laboratory and used on site. On two standard gas mixtures, 80% of SO(2) specific analysers measured within +/- 20%, though at very low ambient concentrations, less than half the instruments showed comparable reproducibility. The standard solutions used for cross-checks showed a generally good agreement between manual analysis procedures, although the flow rates of the samples caused some differences in ambient intercomparisons. For black smoke, the deviations of ambient intercomparison measurements were due to erroneous sampling flow rates, incomplete application of the procedures described in the new reference method of the Directive and questionable linearity of some reflectometers. For suspended particulates measured by gravimetry, the balances showed a close agreement with standard weights and 81% of ambient intercomparisons agreed within an arbitrary difference band.
Bibliographic Reference: EUR 12334 EN (1990) 68 pp., FS, ECU 6.25
ISBN: ISBN 92-826-1271-6
Record Number: 199011815 / Last updated on: 1994-12-02
Original language: en
Available languages: en