Chromatography apparatus with electrochemical detector having carbon-black containing working electrode
US4343767A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1981 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Apr 9, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/64
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flow-through electrochemical cell distinguished by the feature of a working electrode comprising selected carbon black powder(s) dispersed within an inert binder. An outstanding characteristic of the invention is the markedly improved signal/noise ratio of the electrode which enables a significant gain in the sensitivity level at which trace compounds can be detected. As an example of utility, as little as 5 to 30 parts per billion (ppb) of most phenolic compounds in water can be determined by liquid chromatographic separation of species and amperometric electrochemical detection, using the described flow-through cell to monitor the column effluent. No sample preparation is required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.