Community Directive 80/779/EEC specifies maximum permissible levels of sulphur dioxide in the ambient air.
Intercomparisons organized by DG XI in support of the implementation of this Directive have shown differences in excess of 10 % between central laboratories and in excess of 30 % between network monitors. The aim of the project was to improve the analytical technique and agreement between results.
In the first intercomparison the values obtained ranged from 78 to 94 nmol/mol. In the final stage the sampling procedure had been improved (dead volume minimised, length of sampling line minimised, sufficient equilibration time). All laboratories agreed to within a range of 4 nmol/mol.
Funding SchemeCSC - Cost-sharing contracts
SW19 3UF London