Test tube construction and method for testing for copper aerosols
US4329153A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1980 |
| Grant date | May 11, 1982 |
| Priority date | — |
| Expiry date | Sep 30, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for testing copper concentration of a test gas comprises a glass tube having breakoff points at each end with an ampoule filled with a nitric acid arranged upstream of a filter which is followed downstream by a reaction layer of silica gel impregnated with a reagent for copper. The glass tube is opened by breaking off breakoff points at each end and the gas to be tested is pumped through the tube so that any suspended particles including copper particles will be deposited on the filter layer too. Thereafter, the ampoule within the glass tube is broken to release the nitric acid which is directed through the filter layer to the reaction layer. The nitric acid which reacts with the copper deposited on the filter layer moves to the reaction layer and produces a discoloration which is proportional to the amount of copper filtered out from the test air. A chart is made up to provide a color standard which is proportional to the copper concentration in the test gas and the discoloration produced in the reaction layer is compared with this color standard to determine the quantity of copper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.