Test kit for measuring volatile ammonia in biological sample
US6391262B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Aug 16, 1999 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Aug 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/224
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A test kit for determining the “volatile ammonia content” of biological samples comprising any wet or dry compost, manure, plasma or soil sample. The kit includes a transparent container for holding the sample, and a reactant chemistry gel system, located within the container in the space not occupied by the sample. The reactant mass includes an acidic pH reactant material, and a color change indicator material, responsive to pH changes in the reactant material. Ammonia vapors diffuse into the reactant material, reacting chemically with the acidic pH reactant material so as to produce a color change. The nature of the color change is an indication of the quantity of NH3 in the test-jar atmosphere, which in combination with the known pH of the sample, indicates the total ammonium in the biological sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.