一种利用单个SnO_2气体传感器检测农药残留的新方法(英文)

A New Method for Detecting Pesticide Residue by Using a Single SnO_2-based Gas Sensor

研究了一种在环境气氛中快速检测和识别农药残留 (敌百虫和乙酰甲胺磷 )的新方法 ,即动态检测方法。这种方法是利用单个SnO2 气体传感器在方波变化的温度下完成对敌百虫和乙酰甲胺磷及其混合气体的定性分析。实验结果表明 ,SnO2 气体传感器在温度范围为 2 5 0～ 30 0℃、温度变化频率为 2

A new rapid detecting method (called dynamic measurements) to detect and distinguish the presence of two pesticide gases in the atmosphere was reported. The method employed only a single SnO 2-based gas sensor in a rectangular temperature wave mode to perform the qualitative analysis of a binary gas mixture (acephate and trichlorphon) in air. Experimental results show that high selectivity of the sensor achieved in the range of 250～300℃and modulating frequency 20 MHz, one can easily observe the qualitative difference among the responses to the pure acephate and trichlorphon of the same concentration and to there mixture.