Method and apparatus for optimized sampling of volatilizable target substances
US6405608B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Jan 25, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N1/405
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for capturing, from gases such as soil gas, target analytes. Target analytes may include emanations from explosive materials or from residues of explosive materials. The apparatus employs principles of sorption common to solid phase microextraction, and is best used in conjunction with analysis means such as a gas chromatograph. To sorb target analytes, the apparatus functions using various sorptive structures to capture target analyte. Depending upon the embodiment, those structures may include 1) a conventional solid-phase microextraction (SPME) fiber, 2) a SPME fiber suspended in a capillary tube (with means provided for moving gases through the capillary tube so that the gases come into close proximity to the suspended fiber), and 3) a capillary tube including an interior surface on which sorptive material (similar to that on the surface of a SPME fiber) is supported (along with means for moving gases through the capillary tube so that the gases come into close proximity to the sorptive material). In one disclosed embodiment, at least one such sorptive structure is associated with an enclosure including an opening in communication with the surface of a soil region …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.