Method and apparatus for analysis of total atmospheric sulfuric acid content
US4279618A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1980 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Jun 3, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/188
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for determining the level of sufuric acid in atmospheric air which also contains other interferrants, including a sampling cycle to collect sulfuric acid on the walls of a collection chamber tube which is cooled, while at the same time eliminating interfering sulfur dioxide and ammonia by treating them with a dilute flow of hydrochloric acid through the collection chamber, and further including an analysis cycle during which the walls of the collection chamber tube are heated so as to revolatilize the sulfuric acid and entrain it in a clean air stream which then passes to the burner block of a flame photometric detector, the clean air stream being saturated with water vapor to make the revaporization of sulfuric acid more rapid and complete. The apparatus includes a timing clock which operates valves to select the cooling and heating of the collection tube, and to initiate the timely introduction of sample ambient air streams, air carrying the hydrochloric acid, and the saturated air stream, as appropriate for the various different cycles of the system. The apparatus further includes a source of sulfuric acid entrained in a clean air stream which is used to c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.