Sequential Second Derivative Spectroscopy of Cocaine and Adulterants in Street Drug Samples. Part I: Cocaine, Procaine, and Lidocaine

A. Cruz Forensic Toxicology service, Legal Medicine Institute. Faculty of Medicine. University of Santiago de Compostela, Spain

M. López-Rivadulla Forensic Toxicology service, Legal Medicine Institute. Faculty of Medicine. University of Santiago de Compostela, Spain

A. M. Bermejo Forensic Toxicology service, Legal Medicine Institute. Faculty of Medicine. University of Santiago de Compostela, Spain

I. Sánchez Forensic Toxicology service, Legal Medicine Institute. Faculty of Medicine. University of Santiago de Compostela, Spain

P. Fernández Forensic Toxicology service, Legal Medicine Institute. Faculty of Medicine. University of Santiago de Compostela, Spain

Abstract

A sequential spectrophotometric method for the resolution of mixtures of cocaine, procaine and lidocaine in powder samples is proposed. The analytes are determined sequentially in the following order: 1st-Procaine, 2^nd-Cocaine and 3^rd-Lidocaine. The three determinations are carried out in phosphate buffer at pH 7.8. This solvent was selected as alternative to 0.1M HCl and NaOH, because the spectral characteristics, solutions stability and reproductibility were suitable.

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Sequential Second Derivative Spectroscopy of Cocaine and Adulterants in Street Drug Samples. Part I: Cocaine, Procaine, and Lidocaine

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Sequential Second Derivative Spectroscopy of Cocaine and Adulterants in Street Drug Samples. Part I: Cocaine, Procaine, and Lidocaine

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