Determining the Pollutant Emission Rate from a Source
Pollutant Concentration (mg/R.m³) x Effluent Flow Rate (R.m³/s) = Pollutant Mass Rate mg/s
Volumes and volumetric rates measured at Actual Conditions (A) can be converted to Reference or Standard Conditions using the universal gas laws.
Instrumental analyzers typically report pollutant concentrations on a part per million volume basis (ppmv). This unit needs to be converted to a mass per unit volume basis (mg/m³) in order to determine the mass rate of the pollutant.
This is accomplished using the formula below:
MW is the molecular weight of the pollutant gas i.e. 64 g/mole for SO2
MV is the molar volume at reference or standard conditions i.e. 24.45 L/mole at 25°C and 1 atm
In Canada, reference conditions (R) are 25°C and 101.3 kPa. In the United States, standard conditions (S) are 68°F and 29.92 in Hg.
Source Testing (44 KB)