[A microanalytical gas liquid chromatography method with a nitrogen-phosphorus detector in the assay of various psychotropic drugs of tricyclic structure and of their N-demethylated metabolites].

Nanogram amounts of chlorimipramine, chlorpromazine and their Nor1- and Nor2-metabolites were detected in plasma by GLC with nitrogen-sensitive detection. Two extraction procedures were compared. The use of Sep Pak C18 cartridges produced a higher degree of accuracy and precision with significant time and materials saving, as compared to the use of organic solvents in a three steps extraction procedure.