Calculations
3.7.1 Construct a calibration curve by plotting detector response versus concentration (µg/mL) of limonene.
3.7.2 Determine from the calibration curve the concentration (µg/mL) of limonene on each section of the samples and blank.
3.7.3 Blank correct each sample by subtracting the concentration (µg/mL) found in each section of the blank from the concentration (µg/mL) found in the corresponding sections of the samples. Add the results together for the total concentration (µg/mL) for each sample.
3.7.4 Determine the air concentration using the following formula.
mg/m3 = (µg/mL, blank corrected) × (desorption volume, mL)
(air volume, L) × (desorption efficiency, decimal)
ppm = (mg/m3)(24.46)
136.23
where 24.46 = molar volume (liters) at 101.3 kPa (760 mmHg) and 25°C.
136.23 = molecular weight of limonene.