EVALUATION OF METHOD:
The desorption efficiency, at levels ranging from 5 times the LOQ to 0.1x the REL, was determined for each
analyte by spiking known amounts (in CS2
) on coconut shell charcoal tubes. Both groups of analytes (A
and B) were spiked together on the charcoal sorbent tubes. All analytes, with the exception of styrene and
naphthalene, exhibited acceptable desorption efficiency recovery results at all five levels evaluated. Styrene
failed to meet the 75% recovery criteria at the 18.1 µg and 90.6 µg levels. Naphthalene failed to meet the 75%
criteria at all levels evaluated ranging from 48.8 µg to 976.0 µg.