Method of calibration using analytical apparatus for measurement of low concentration constituent
US6679093B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2002 |
| Grant date | Jan 20, 2004 |
| Priority date | — |
| Expiry date | Oct 17, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/965
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An analytical apparatus for measuring a low concentration of a constituent in a stream at a parts per billion level is provided. The apparatus comprises a sample loop having a predetermined volume for receiving a sample from the stream, a purifier for producing substantially pure carrier liquid from a sample of the stream, a first and a second multi-path valve, a preconcentrator column for absorbing and increasing the concentration of the low concentration constituent, an eluent, and a detector. In one embodiment, the apparatus is an ion chromatograph and may be used to analyze ions at concentrations as low as about 1 to about 500 parts per trillion. A method for analyzing a stream for a low concentration constituent present in a stream at a parts per billion level is also provided. The invention also includes methods for single- and multi-point calibration of a detector in an analytical apparatus for measuring a low concentration of a constituent in a stream at a parts per billion level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.