cen:proj:80074

Metrological traceable protocol for the calibration of oxidised mercury gas generators cen:proj:80074

Scope

This protocol specifies the procedures for establishing traceability to the SI for the quantitative output of oxidised mercury gas generators that are employed in regulatory applications for emission monitoring or testing.
This protocol provides methods for 1) Calibrating the output of a candidate generator by comparison with a reference standard, 2) Calculating the mercury concentration and the associated uncertainty of the mercury concentration generated with the candidate generator in relation to the known uncertainty of the reference standard and 3) Determining the interpolation function between setpoint of the candidate generator and the output mercury concentration.
This protocol specifies a measurement method for the determination of the output of candidate generators used to calibrate mercury analysers for the determination of the concentration of mercury in emission sources and ambient air.
The method is applicable for different types of mercury gas generators 1) Saturation gas generators, working according to ISO 6145-9, 2) Permeation gas generators, working according to ISO 6145-10 and 3) Continuous injection gas generators, working according to ISO 6145-4.
The concentrations are expressed in ng m-3 or μg m-3 (at 0 °C and 101.325 kPa).
A separate Work Item is established to develop a metrological traceable protocol for the calibration of elemental mercury gas generators.