Sensitivity. The application of activation analysis t o strontium-84 micro estimations allowed amounts of the order of gr:tm to be detected with ease. As the half life was relatively long, the samples could be processed in large batches and their activity detected later when all the samples were completed. Tests on solutions of known strontium-84 content gave experimental results which were in the range ztlyo of the (calculated value.Biological samples varying in known strontium-84 content from gram to 10-6 gram were malyzed by the above method and gave experimental results which were in the range *2Q/, of the calculated value. Identificatiion and CONCLUSIONThis type of analysis was made possible by the use of activation analysis and made simple by the ability to add relatively large amounts of carrier strontium, thus removing the need for micro separation techniques.The mixed ferrocyanide was useful in the separation of calcium from barium and strontium. ACKNOWLEDGMENT The author thanks John Glaister, J.M.A. Lenihan, and Edgar Rentoul Origin Determinations of Cannabis by Gas aind Paper Chromatography b The cannabinols present in the leaves and flowering tops ccin be characterized by relative retention times and Rf values.Pyrahexyl, a commercially available tetrahydrocannabinol homologue, may be used as a reference. The Beam reaction diffcrentiatescannabidiol from the other ccinnabinols in gas chromatographic fralctions and on paper chromatograms. This test may now be considered ,characteristic of cannabis. A plot of peak areas of cannabidiol vs. cannabinol plus tetrahydrocannabinol permits differentiation between cannabis of different geog ra p hica I origins. HE FOLLOWING !cannabinols are T contained in Cannabis sativa L.: i=-0 CH/ 'CH3 Tetrahydrocannabinol (THC)for support and laboratory facilities during the investigation.
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