Apparatus for urea analysis

US4614577A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Dec 27, 1984
• Grant date: Sep 30, 1986
• Expiry date: Dec 27, 2004

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 a 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.