Journal of Analytical Methods in Chemistry

Research Article

Determination of Morphine and Codeine in Human Urine by Gas Chromatography-Mass Spectrometry

Figure 2

Chromatograph of urine sample containing 1600 ng/mL morphine (a) and codeine (b) processed through the procedure.
151934.fig.002a
(a)
151934.fig.002b
(b)