Methods The ketamine and its major metabolites in urine was extracted with organic solvent and detected by GC/NPD, GC/ECD, GC/FID and GC/MS.

• 方法尿液用有机溶剂液-液萃取,气相色谱/氮磷检测器、电子捕获检测器、氢火焰检测器和气-质联用仪测定。