Water quality control method, and method and apparatus for measuring electrical conductivity used in the water quality control
US4853638A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1988 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Jan 7, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/182
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Electric conductivities of an aqueous solution under measurement are measured at two or more different temperatures in a range To to Tn, and a relationship between the electrical conductivity and the temperatures is obtained. A solute substance in the aqueous solution is determined by applying this relationship against a known temperature and electrical conductivity relationship of an individual substance. A concentration of the determined substance is estimated by applying the electrical conductivity at the lowest temperature To to a known relationship between an electrical conductivity and a concentration at the same temperature To with respect to an individual substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.