Fig. 3From: Analysis of opioids in postmortem urine samples by dispersive liquid-liquid microextraction and high performance liquid chromatography with photo diode array detectionEffect of extraction time (minutes) on the recovery of morphine, codeine and methadone. Extraction conditions: sample volume: 5 ml, volume of acetone: 500 μl and volume of chloroform: 300 μl, pH 9.8, the spiked concentration of morphine, codeine and methadone were 10 μg ml− 1Back to article page