Ultra-low range chlorine determination
US5362650A · kind A · utility
12Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | Oct 4, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/25375
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining trace amounts of total chlorine present in a water sample. The method includes use of DPD as an indicator. The sample is filtered after a color development delay, and then light absorbance through the sample is measured. A control sample is treated with malonic acid to de-chlorinate the control. Light absorbance through the sample being tested is adjusted by the light absorbance through the control sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.