Further studies on spot tests and microcrystal tests for identification of cocaine

Jamie Swiatko¹, Peter R De Forest, Morris S Zedeck

¹Department of Sciences, John Jay College of Criminal Justice, The City University of New York, 445 West 59th Street, New York, NY 10019, USA.

|May 24, 2003

Abstract:

The presence of cocaine in illicit drug samples is still being determined in some laboratories using spot tests and microcrystal tests. Seventeen chemical species were tested using three different spot tests (Wagner, Marquis, and cobalt thiocyanate followed by stannous chloride reactions) and two microcrystal tests (gold chloride and platinic chloride) to determine whether the results could be differentiated from the results of these tests on cocaine. The data obtained indicated that nine of the 17 compounds gave results similar to those from cocaine using the three spot tests, but that the results from microcrystal testing allowed for differentiation of all nine compounds from cocaine.

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Abstract:

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