High solids content sample torches and method of use
US5233156A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1991 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Aug 28, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H1/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Torches of the type used in Inductively Coupled Plasma sample analysis systems are disclosed. The torches are designed to provide a user with the ability to minimize sample carry-over and torch clogging problems during use. The torches are suitable for use with high solids content samples prepared by ultrasonic nebulization and other high efficiency sample introduction systems. The torches incorporate means based upon design criteria which include minimization of critical tapers or constrictions in sample injecting tube and other tubes of a torch, providing means which allow control of the temperature of various components in a torch and indirectly a sample per se introduced thereto, and providing means which allow auxiliary gas flows through a torch which aid sample flow through the torch. In addition, external control of sample solvent vapor content can be practiced during an analysis procedure to further reduce any tendency of sample solids to adhere to and accumulate upon torch components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.