title: [Determination of microgram amounts of heavy metals in organic substance by X-ray fluorescence spectrometry: application to the determination of heavy metal contents in crude drugs].
mesh_terms: D008670:Metals / Q000032:analysis*; D010936:Plant Extracts / Q000032:analysis; D010946:Plants, Medicinal / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D008670:Metals; D010936:Plant Extracts