Your pre-sampling and post-sampling pump calibrations using a primary standard are both 0.05 L/min. You collect personal samples on two employees working in the operation. The samples are collected for 450 minutes (Sample 1) and 460 minutes (Sample 2).
Calculate the sample volumes for each of the samples. The laboratory reports that the front section of Sample 1 contains 4,500 µg of methyl n-amyl ketone and the back section contains 100 µg of methyl n-amyl ketone. The front section of Sample 2 contains 5,500 µg of methyl n-amyl ketone and the back section contains 200 µg of methyl n-amyl ketone. Neither the front nor back sections of the field blank you supplied contain any detectable levels of methyl n-amyl ketone.