Voltammetric determination of morphine in poppy straw concentrate at a glassy carbon electrode

Morphine is determined by oxidation at a glassy carbon electrode in methanolic carbonate buffer. Samples are taken up in dilute hydrochloric acid, and aliquots are transferred to the supporting electrolyte for differential pulse voltammetry. Precision averaged 1–2% and linear calibration graphs were obtained over the range 10–40 ppm. Results compared favorably with those obtained by other methods.