Apparatus and method for sampling
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. An ionization device comprising:
(a) an atmospheric ionization sorbent module including a sorbent material and a headspace;
(b) a device adapted to introduce one or more analyte molecules to the headspace adjacent to the sorbent material;
(c) a heat source adapted to heat the sorbent material; and
(d) an atmospheric ionizer adapted to direct a plurality of ionizing species at the sorbent material to generate one or more molecule ions of the one or more analyte molecules.
2. The device of claim 1 , where in step (b) the one or more analyte molecules can be absorbed, adsorbed or condensed on the sorbent material.
3. The device of claim 1 , where a thermoelectric source is used to heat the sorbent material.
4. The device of claim 1 , where the temperature of the sorbent material is controlled by a temperature controller.
5. The device of claim 1 , further comprising where the sorbent material is segmented.
6. The device of claim 5 , where the segmented sorbent material collects both low vapor pressure molecules and high vapor pressure molecules.
7. The device of claim 5 , where a first segment of the sorbent material is analyzed at a first temperature and a second segment of the sorbent material is analyzed at a second temperature, where the first temperature is not equal to the second temperature.
8. The device of claim 1 , where the temperature of the sorbent material is held for a period of time at between:
a lower limit of approximately 1×10 2 degrees K; and
an upper limit of approximately 4×10 2 degrees K.
9. The device of claim 1 , further comprising directed ionizing species generated at different temperatures at the sorbent material.
10. The device of claim 1 , further comprising directed ionizing species generated with different reagent species at the sorbent material.
11. A method of ionizing one or more analyte molecules comprising:
(a) introducing one or more analyte molecules to an atmospheric ionization sorbent module (AISM), the AISM including a sorbent material and a headspace;
(b) heating the sorbent material; and
(c) directing a plurality of ionizing species at the sorbent material to generate one or more molecule ions, thereby ionizing the one or more analyte molecules.
12. The method of claim 11 , where the one or more analyte molecules can be absorbed, adsorbed or condensed on the sorbent material.
13. The method of claim 11 , where the temperature of the sorbent material is controlled by a temperature controller.
14. The method of claim 11 , further comprising directed ionizing species generated at different temperatures at the sorbent material.
15. A system of ionizing one or more analyte molecule comprising:
(a) an atmospheric ionization sorbent module (AISM), the AISM including a sorbent material and a headspace;
(b) a device to introduce one or more analyte molecules to the headspace adjacent to the sorbent material;
(c) a heat source to heat the sorbent material; and
(d) an atmospheric ionizer to direct a plurality of ionizing species at the sorbent material to generate one or more molecule ions of the one or more analyte molecules.
16. The system of claim 15 , further comprising a temperature controller to control the temperature of the sorbent material.
17. The system of claim 15 , further comprising directed ionizing species generated at different temperatures at the sorbent material.
18. The system of claim 15 , further comprising directed ionizing species generated with different reagent species at the sorbent material.
19. The system of claim 15 , further comprising where the sorbent material is segmented.
20. The system of claim 19 , where a first segment of the sorbent material is analyzed at a first temperature and a second segment of the sorbent material is analyzed at a second temperature, where the first temperature is not equal to the second temperature.