Method and device for the detection of not easily volatized substances

US6521119B2 · kind B2 · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Michael Krausa · Remchingen, DE
• Klaus Schorb · Rheinstetten, DE
• Stefan Krebs · Krefeld, DE
• Frank Becker · Karlsruhe, DE

Key dates

• Filing date: Apr 4, 2001
• Grant date: Feb 18, 2003
• Expiry date: Apr 4, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4045
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and device for the detection of substances such as nitrotoluene, trinitrotoluene, dinitrotoluene, or derivatives, wherein a working electrode and an opposing electrode are contacted with the substance via a viscous electrolyte layer and a voltage is applied to the working electrode whose value is increased and decreased at least once with substantially equal beginning and end values within a predetermined time period, wherein the current strength is determined during this at least one measurement cycle in dependence on the applied voltage, is distinguished in that a plurality of measurement cycles are scanned, and differences of current values of sequential measurement cycles are determined and, in the event of the occurrence of a cathode current maximum, the associated voltage value is determined, held constant and the current strength extracted.