Apparatus and method for chemical phase sampling analysis
In various embodiments of the invention, a sorbent coated mesh or grid introduced into contact with a sample can be monitored at appropriate temperatures, positions and time intervals to determine species present in the sample. The monitoring utilizes reactive species produced from an atmospheric analyzer to ionize analyte molecules present on the sorbent coated mesh or grid 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 from the sample whereafter the sorbent surface can be interrogated with the reactive species to generate analyte species characteristic of the sample.
1. A system for analyzing a sample comprising:
a sample collection device comprising:
a first tine with a first major axis adapted for insertion into a container;
a first sorbent material applied to a first area of the first tine; and
a second sorbent material applied to a second area of the first tine, where the first sorbent material is adapted to collect a first sample molecule present in the sample, where the second sorbent material is adapted to collect a second sample molecule present in the sample;
a mesh in proximity with the first tine;
a power source electrically connected to the mesh adapted to deliver at least a first current to the mesh;
an ionization source directing ionizing species at the first area to generate a plurality of ions of the sample; and
a spectrometer adapted to analyze the plurality of ions of the sample.
2. The system of claim 1 , further comprising a holder to position the first tine relative to the mesh, where the holder is adapted to adjust at least the first area in registration with the mesh.
3. The system of claim 1 , where a distance between the first area and the mesh is between:
a lower limit of approximately 10 −5 m; and
an upper limit of approximately 10 −2 m.
4. The system of claim 1 , where a distance between the first area and the mesh is between:
a lower limit of approximately 10 −4 m; and
an upper limit of approximately 10 −3 m.
5. The system of claim 2 , where the holder can adjust a distance between the first area and the mesh between:
a lower limit of approximately 10 −4 m; and
an upper limit of approximately 10 −3 m.
6. The system of claim 2 , where the holder can adjust a distance between the first area and the mesh such that the energy reaching the first area is between:
a lower limit of approximately 10 −6 W; and
an upper limit of approximately 10 −1 W.
7. The system of claim 1 , further comprising a second tine with a second major axis.
8. The system of claim 7 , where the first major axis is parallel to the second major axis.
9. The system of claim 7 , where the first tine is co-planar with the second tine.
10. The system of claim 7 , where the second tine comprises the first sorbent material applied to a first area of the second tine and the second sorbent material applied to a second area of the second tine.
11. The system of claim 7 , where one or both the first tine and the second tine comprise a grid.
12. The system of claim 11 , where the grid comprises a plurality of holes.
13. The system of claim 1 , where the first area of the first tine comprises a grid with a plurality of holes.
14. The system of claim 1 , where the second area of the first tine comprises a grid with a plurality of holes.
15. A method for analyzing a sample comprising:
receiving a first tine with a first major axis comprising:
a first sorbent material applied to a first area of the first tine; and
a second sorbent material applied to a second area of the first tine, where the first sorbent material is adapted to collect a first sample molecule, where the second sorbent material is adapted to collect a second sample molecule;
positioning the first tine in proximity to a mesh;
applying a first current to the mesh;
directing an ionizing species at one or both the first area and the second area;
generating a plurality of ions from one or both the first area and the second area; and
analyzing the plurality of ions with a spectrometer.
16. The method of claim 15 , where the first current heats the mesh with the first area in registration with the mesh.
17. The method of claim 16 , where a second current heats the mesh with the second area in registration with the mesh.
18. The method of claim 15 , where the ionizing species are generated with an ionization source selected from the group consisting of Direct Analysis Real Time (DART) source, a Dielectric barrier discharge (DBDI) source and a Desorption Electrospray Ionization (DESI) source.
19. A system for vaporizing a sample comprising:
a tine with a first major axis;
a first sorbent material applied to a first area of the tine, where the first sorbent material is adapted to collect one or more first sample molecules;
a second sorbent material applied to a second area of the tine, where the second sorbent material is adapted to collect one or more second sample molecules, where the one or more first sample molecules are not the same as the one or more second sample molecules;
a mesh in proximity with the tine; and
a power source electrically connected to the mesh to heat the mesh, where the mesh transfers heat to the tine to vaporize the sample.
20. The system of claim 19 , further comprising an ionization source directing ionizing species at the first area or the second area to generate ions of the sample.