Process for the quantitative determination of the oxygen demand of water containing oxidizable matter

US4244695A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Werner Melzer · Liederbach, DE
• Dieter Jaenicke · Hofheim, DE

Key dates

• Filing date: Jul 19, 1979
• Grant date: Jan 13, 1981
• Expiry date: Jul 19, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/1806
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

For the quantitative determination of the total oxygen demand of water containing oxidizable matter, the water is continuously evaporated at about 900.degree. C. in the presence of varying amounts l.sub.1, . . . , l.sub.n of oxygen-containing gas added per unit of steam at continuously repeated intervals. The oxygen-containing gas should not exceed 1 to 5% by volume, calculated on the amount of steam produced during each interval. The residual oxygen concentrations S.sub.1, . . . , S.sub.n in the steam gas/mixture are measured for the different amounts of oxygen-containing gas added and the oxygen demand is calculated from the residual concentrations and the added amounts of the oxygen-containing gas.