Method for urea analysis

US4505784A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Konrad Mund
• Gunter Luft · Achern, DE
• Ulrich Gebhardt · Langensendelbach, DE

Key dates

• Filing date: Jul 19, 1982
• Grant date: Mar 19, 1985
• Expiry date: Jul 19, 2002

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N33/62
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

For determining the urea concentration in liquids in continuous operation, with high sensitivity and reliable determination of the urea content over an extended period of time, an electrode which is separated from the urea containing liquid by means of a diaphragm with a diffusion coefficient of less than 10.sup.-7 cm.sup.2 s.sup.-1 for urea has impressed on it potentiostatically and cyclically, two potential values, the more positive potential being between 0.9 and 2.0. V/H.sub.2 rev and the more negative potential being lower than 0.6 V/H.sub.2 rev, and at the more positive potential, the current flowing within a predetermined time interval is evaluated as the measuring signal.