An internal standard method has been applied for the determination of lanthanum, antimony, scandium, chromium, iron and cobalt
in commercial cigarettes by neutron activation analysis using gold as an internal standard element. These trace elements were
separated from irradiated samples by APDC (ammonium pyrrolidine dithiocarbamate)/Zeph (tetradecyl dimethyl benzyl ammonium
chloride) coprecipitation, followed by direct gamma-counting of the separated precipitate using a Ge(Li) detector. Standard
reference tobacco 1R1 prepared by the University of Kentucky was also analyzed by this procedure for the above 6 elements,
the results of which were compared with literature values. Good results were obtained by the present method.