초록

A passive air sampler is designed to facilitate emptying granular or particulate adsorbent from it directly into a thermal desorption tube or other vessel for use in an analytical instrument. The preferred form has an adsorbent container in a conical or funnel-like shape.

대표청구항 ▼

1. A passive air sampler comprising particulate adsorbent and a container therefor having a generally conical shape, said container including an opening for draining to empty said particulate adsorbent by gravity from said container into a thermal desorption tube for chromatographic analysis. 2. A p

1. A passive air sampler comprising particulate adsorbent and a container therefor having a generally conical shape, said container including an opening for draining to empty said particulate adsorbent by gravity from said container into a thermal desorption tube for chromatographic analysis. 2. A passive air sampler of claim 1 including a perforated panel to admit air to said container. 3. A passive air sampler of claim 1 including means for fastening said air sampler to a user's clothing. 4. A passive air sampler of claim 2 including a membrane for excluding water droplets from said container. 5. A passive air sampler of claim 2 including a screen for retaining adsorbent within said sampler. 6. A passive air sampler of claim 1 including at least one conductive surface for dispersing electrostatic charges. 7. A passive air sampler of claim 1 contacted with a vessel for receiving said particulate adsorbent from said container and extracting sampled material from said adsorbent. 8. A passive air sampler comprising a container for granular adsorbent and granular absorbent substantially filling the volume of said container, said container including an outlet neck for said adsorbent, a perforated panel for admitting air to said container, and a stopper for said outlet, said outlet neck being of a shape for mating with the intake opening of a sample-receiving vessel for chemical analysis. 9. A passive air sampler of claim 8 including means for attaching said sampler to the clothing of a user. 10. A passive air sampler of claim 8 wherein said adsorbent is a carbonaceous adsorbent. 11. A passive air sampler of claim 8 including a membrane near said panel for admitting air, for excluding water droplets in said air from said container. 12. A passive air sampler of claim 8 wherein said container has a conical shape. 13. A passive air sampler of claim 8 wherein said container has a shape substantially similar to a conical funnel. 14. Passive air sampler of claim 8 mated with a sample-receiving vessel for receiving said particulate adsorbent from said container. 15. Method of obtaining samples of contaminants in air comprising adsorbing said contaminants on a particulate adsorbent in a passive sampler, connecting a thermal desorption tube to said passive sampler, and draining said particulate adsorbent by gravity from said sampler into said thermal desorption tube. 16. Method of claim 15 wherein the volume of said particulate adsorbent in said passive sampler is no greater than the internal volume of said thermal desorption tube. 17. Method of claim 15 followed by desorbing said contaminants from said adsorbent into a carrier gas therefor in said thermal desorption tube and analyzing said carrier gas for said contaminants. 18. Method of claim 15 wherein said passive sampler is worn by a human.