Rectangular mode of operation for detecting pesticide residue by using a single SnO2-based gas sensor

A new rapid detecting method (called dynamic measurements) was reported to detect and distinguish the presence of two pesticide gases in the ambient atmosphere. The method employed only a single SnO2-based gas sensor in a rectangular temperature mode to perform the qualitative analysis of a binary gas mixture (acephate and trichlorphon) in air. Experimental results showed that high selectivity of the sensor achieved in the range of 250-300 degreesC and modulating frequency 20 mHz, one can easily observe the qualitative difference among the response to pure acephate and trichlorphon gases of the same concentration and to the mixture. (C) 2003 Elsevier B.V. All rights reserved.