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 0MHz的工作条件下对敌百虫和乙酰甲胺磷及其混合气体表现出高的灵敏度和清晰的动态特征响应 A new method for the rapid detection and identification of pesticide residues (trichlorfon and acephate) in the ambient atmosphere was studied, namely the dynamic detection method. This method uses a single SnO2 gas sensor to perform a qualitative analysis of trichlorfon and acephate and their mixtures at a square wave temperature. The experimental results show that the SnO2 gas sensor shows high sensitivity and clear sensitivity to trichlorfon and acephate and their mixtures under the working conditions of temperature range of 250 ~ 300 ℃ and temperature changing frequency of 20 MHz Dynamic Feature Response