Determining the concentration of a biocide additive in a liquid
US4036589A · kind A · utility
8Cited by
3References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1976 |
| Grant date | Jul 19, 1977 |
| Priority date | — |
| Expiry date | Mar 22, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/255
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and a kit for testing the biocide concentration of a liquid containing a biocide of the type which breaks down in acidic aqueous solution to liberate formaldehyde. A strong aqueous acid is added to the liquid, and a modified Schiff's reagent is also added. Time is given for color to develop, and then the color intensity of the solution is read. In instances where oil-water emulsions or latices are involved, the emulsion is broken before adding the Schiff's reagent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.