Aqueous solution based on an azo dye, process for its manufacture and use thereof
US6777242B1 · kind B1 · utility
4Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1999 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Sep 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/193333
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a stable aqueous solution (A) comprising an azo dye, a borate buffer and one or more masking agents, wherein the azo dye changes its coloration or coloration intensity in the presence of chlorine dioxide. The present invention further relates to a process for manufacturing the aqueous azo-dye solution (A), and to its use for the determination of residual chlorine dioxide in water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.