through the glass tube. In normal use, the entire gas flow passes
over the adsorbent material.
A sample of flooring material (10 mm 50 mm 7.6 mm,
W L T) was placed in a glass extraction tube. The VOCs and
formaldehyde were purged under a pure nitrogen gas stream at
a constant flow on a Tenax TA tube and 2,4-DNPH cartridge. The
emission rate considered the area specific emission factor and air
exchange rate ratio of the volume of clean air brought into emission
TE per hour and the free emission TE volume measured in identical
units (mg/m2 h). The thermal extraction process was applied at 25,
35 and 45 C for 30 min (Table 1 lists the test conditions.).
The sampling volume was 1 L. Air sampling was performed at
a flow rate of 39 ml/min for approximately 30 min. Due to the low
volume of the glass tube and high nitrogen gas flow, the air
exchange rate was 90 h1 (Table 1 lists the test conditions). The
tests were carried out at three temperatures, 25 1, 35 1 and
45 1 C, with the humidity uncontrolled but w55 10% R.H. The
VOCs and carbonyl compounds concentrations were analyzed by
TD-GC/MSD and HPLC, respectively.
3