Apparatus and method for sampling of confined spaces
In various embodiments of the invention, a cargo container can be monitored at appropriate time intervals to determine that no controlled substances have been shipped with the cargo in the container. The monitoring utilizes reactive species produced from an atmospheric analyzer to ionize analyte molecules present in the container which are then analyzed by an appropriate spectroscopy system. In an embodiment of the invention, a sorbent surface can be used to absorb, adsorb or condense analyte molecules within the container whereafter the sorbent surface can be interrogated with the reactive species to generate analyte species characteristic of the contents of the container.
1. A chemical signature system comprising:
a sorbent material adapted to collect one or more analyte molecules; and
a chemical code positioned on the sorbent material, where the chemical code comprises a plurality of compounds, where two or more of the plurality of compounds produce a plurality of ions when analyzed by one or more atmospheric ionizers, where the plurality of ions generate a chemical signature, where the chemical signature represents one or more pieces of information about the one or more analyte molecules collected on the sorbent material.
2. The system of claim 1 , where the one or more analyte molecules collected on the sorbent material are one or more of absorbed, adsorbed and condensed on the sorbent material.
3. The system of claim 1 , where at least one of the plurality of compounds is impregnated on the sorbent material.
4. The system of claim 1 , where the one or more pieces of information include whether the sorbent material has been tampered with or disabled.
5. The system of claim 1 , where the one or more pieces of information include the integrity of the one or more analyte molecules collected.
6. The system of claim 1 , where the sorbent material is exposed to a reactive species prior to analysis by the one or more atmospheric ionizers.
7. The system of claim 1 , where the positional relationship of two or more of the plurality of compounds can be used to interrogate the chemical code.
8. The system of claim 7 , where the positional relationship of two or more of the plurality of compounds can be used to verify the integrity of the one or more analyte molecules.
9. The system of claim 7 , where the positional relationship of two or more of the plurality of compounds can be used to verify the one or more analyte molecules have not been tampered with or disabled.
10. A chemical signature device comprising:
a sorbent material containing one or more analyte molecules; and
a chemical code associated onto the sorbent material, where the chemical code comprises a plurality of compounds, where two or more of the plurality of compounds produce a plurality of ions when analyzed by one or more atmospheric ionizers, where the plurality of ions generate a chemical signature, where the chemical signature represents one or more pieces of information about the one or more analyte molecules collected on the sorbent material, where one or more of the plurality of compounds are one or both stable to oxidation and stable to further oxidation.
11. The device of claim 10 , where the chemical code includes one or more molecules with a vapor pressure that insures that the one or more molecules remain on the sorbent material for approximately twelve months.
12. The device of claim 10 , where the chemical code does not produce ions that interfere with the analysis of substances selected from the group consisting of explosives, radiation threat molecules and illicit drug molecules.
13. The device of claim 10 , where the chemical code includes one or more molecules selected from the group consisting of polydisperse synthetic organic polymers, monodisperse synthetic organic polymers, paints, dyes, organic molecules and inorganic molecules.
14. The device of claim 10 , where the chemical code includes one or more polymer molecules selected from the group consisting of polyether, polyglycol, polyester, polyethylene, poly(halogen)ethylene, polypropylene, polyvinylidene halogen, polymethylmethacrylate, polyacrylonide, polycaprolactone, polylactide, poly butylene succinate, polybutylene succinate adipate, polybutylene succinate terephthalate, poly-hydroxypropionate, poly-hydroxybutyrate, poly-hydroxyvalerate, poly-hydroxyhexanoate, poly-3-hydroxyoctanoate, poly-3-hydroxyphenylvaleric acid and poly-3-hydroxyphenylhexanoic acid.
15. The device of claim 10 , where the chemical code includes one or more dye molecules selected from the group consisting of methoxycoumarin, coumarins, fluorescein, bodipy-Fl, ethidium bromide, bodipy-R6G, Rhodamine, TAMRA, Cy-3 and Coomassie blue.
16. The device of claim 10 , where the chemical code includes one or more transition metal complex molecules selected from the group consisting of FeS, NiO, SiO 2 , Ni 2 O 3 , Al 2 O 3 , Fe 2 O 3 and Fe 3 O 4 .
17. The device of claim 10 , the chemical code comprises a mixture of monodisperse polystyrene, Coomassie blue, fructose and Fe 2 O 3 .
18. A chemical signature device comprising:
a sorbent material containing one or more analyte molecules; and
a chemical code associated onto the sorbent material, where the chemical code comprises a plurality of compounds, where two or more of the plurality of compounds produce ions when analyzed by one or more atmospheric ionizers, where the chemical code is arranged in a specific pattern on the sorbent material to represent one or more pieces of information about the one or more analyte molecules collected on the sorbent material.
19. The device of claim 18 , where the specific pattern is a bar code.
20. The device of claim 18 , where the chemical code can be interrogated with a specific wavelength of light to read the chemical code.