where: RRF = Relative response factor.
A = Area of the primary ion for the compound to be measured, counts. x
A = Area of the primary ion for the internal standard, counts. is
C = Concentration of internal standard spiking mixture, ppbv. is
C = Concentration of the compound in the calibration standard, ppbv. x
[Note: The equation above is valid under the condition that the volume of internal standard spiking mixture
added in all field and QC analyses is the same from run to run, and that the volume of field and QC sample
introduced into the trap is the same for each analysis. C and C must be in the same units.]