Abstract
Ecgonidine methyl ester (EDME), a product of the thermal decomposition of cocaine, has been identified as a likely candidate for the detection of concealed cocaine by vapor sniffing. Using a continuous-flow vapor generator preconcentration/thermal desorption technique in combination with GC-TSD analysis, the vapor pressure of EDME was measured between −20 and +20 °C, and the results were fitted into the following equation: log P = 16.6 − (3.64 × 103/T), where P is in parts per billion and the temperature is in kelvin. At 20 °C, the vapor pressure of EDME is 16 ppm, approximately 5 orders of magnitude higher than that of cocaine base.
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