All integrated breathing zone and area samples were
obtained using either Gilian Gilair 5 sampling pumps with
constant low flow modules (Gilian, Sensidyne Inc.) or PAS-
500 mini-pumps (Spectrex Inc., Cedar Grove, N.J.). The flow
rate was 100 mL/min. All pumps were calibrated before and
after each sampling day using a Gilibrator-2 Primary FlowCalibrator
(Gilian, Sensidyne Inc.) with a representative charcoal
tube sampler in line. Differences in pre- and postcalibration
values were within 5% in all cases. Pre- and postcalibration
values were averaged to calculate the volume of air sampled. At
the end of each sample period, charcoal tubes were capped and
transported to the laboratory, where they were stored at−20◦C.
All integrated breathing zone and area samples wereobtained using either Gilian Gilair 5 sampling pumps withconstant low flow modules (Gilian, Sensidyne Inc.) or PAS-500 mini-pumps (Spectrex Inc., Cedar Grove, N.J.). The flowrate was 100 mL/min. All pumps were calibrated before andafter each sampling day using a Gilibrator-2 Primary FlowCalibrator(Gilian, Sensidyne Inc.) with a representative charcoaltube sampler in line. Differences in pre- and postcalibrationvalues were within 5% in all cases. Pre- and postcalibrationvalues were averaged to calculate the volume of air sampled. Atthe end of each sample period, charcoal tubes were capped andtransported to the laboratory, where they were stored at−20◦C.
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