Sampling cartridge for gas sampling apparatus
A sampling cartridge for a gas sampling apparatus includes a shell having a cylindrical wall and a sampling window extending through the wall. A pair of spools are coaxially and internally positioned within the shell. The spools are independently rotatable relative to the shell. A first spool may include multiple interval sample collectors while the second spool includes a duration sample collector. Each spool also has a window closing surface which is positioned adjacent the window whenever an access door of the gas sampling apparatus is opened. The sampling cartridge may also include a fully encapsulated section of sample collector material as a negative control, and an integral RF tag for storing chain of custody information including personal identification information of a cartridge replenisher.
1. A method of collecting a particulate sample with gas sampling apparatus having an access door, comprising:
collecting the sample on a substrate;
automatically sealing the substrate whenever the access door is opened; and
recording chain of custody information on memory means associated with the substrate.
2. The method of claim 1 , wherein the substrate comprises a substrate of a sampling cartridge, said sealing comprises self-sealing said cartridge, and said recording comprises recording the chain of custody information on a radio frequency tag integral with the cartridge.
3. The method of claim 2 , wherein said chain of custody information includes personal identification information of a cartridge replenisher.
4. The method of claim 2 , further including incorporating a fully encapsulated portion of virgin substrate material as a negative control in said cartridge.