Abstract
One hundred poisons and their related compounds including pesticides, hypnotics, psychotropics, narcotics, local anesthetics etc., have been classified into four divisions by relative Rf values to standard maker on silica gel thin layer chromatography, by use of four developing solvents and seven chromogenic reagents. The markers used were methyl yellow, methyl red, tetrabromophenol phthalein ethylester, malachite green and rhodamine B. It is decided that the first division is pesticides and some psychotropics, the second is hypnotics and some pesticides, the third is psychotropics, local anesthetics, narcotics and others and the fourth is sympathomimetics and others.