DNPH-coated silica gel adsorbent tubes. The SKC adsorbent tube is a
glass tube containing a front bed of 300 mg DNPH-coated silica gel and a back
bed of 150 mg DNPH-coated silica gel. Airflow through the tube should be from
front bed to back bed, as indicated by the arrows marked on the glass cartridge.
Tubes are available with an ozone scrubber (SKC Inc., Eighty Four, PA; Cat. No.
226-120) or without the scrubber (SKC Inc., Eighty Four, PA; Cat. No. 226-119).
SKC manufactures these tubes to meet the following criteria:
•Total formaldehyde concentration: