The procedure included solid-phase extraction, clean up and determination by GC using single capillary column and NPD and ECD detector.

• 样本采用固相萃取提取净化，用气相色谱法在同一根色谱柱上分离后分别进入氮磷检测器（NPD） 、电子捕获检测器（ECD）进行检测。