Method of and system for determining particular species of chlorine in a water sample
US4391775A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 7, 1981 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Dec 7, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/196666
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A technique for determining and distinguishing between specific species of chlorine in a supply of water is disclosed herein along with certain applicable apparatus. In carrying out this technique, one or more water samples are obtained from a larger supply and made to display a pH within a specific range. In a preferred embodiment, a sample is provided for each of the different species of chlorine to be determined. A predetermined amount of hydrogen peroxide is added to each of these samples. If hypochlorous acid and/or hypochlorite (one of the species to be determined) is present in any of the samples, the hydrogen peroxide by itself will react therewith for producing oxygen. If however either monochloramine or dichloramine (other chlorine species) is present, it is necessary to combine the hydrogen peroxide with a certain minimum amount of iodine, preferably in the form of potassium iodide, to produce an oxygen evolving reaction. Dichloramine requires a greater concentration of iodine than monochloramine and, hence, the two can be distinquished from one another. In each case, the produced oxygen is detected for determining whether any or all of these chlorine species are present…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.