The classical cobalt(II) thiocyanate reagent has been rendered more sensitive and selective so as to provide a convenient field test for cocaine, methaqualone and methadone, substances that fail to give clear positive responses in the widely used Marquis procedure.
G. V. Alliston, A. F. F. Bartlett, M. J. de Faubert Maunder and G. F. Phillips, Analyst, 1972, 97, 263 DOI: 10.1039/AN9729700263
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