Determination of germanium in medicinal plants by atomic absorption spectrometry with electrothermal atomization.

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Flameless atomic absorption spectrometry combined with solvent extraction was developed for the determination of germanium in medicinal plants. A wet oxidation procedure using only nitric acid was suitable for ashing plant samples. Carbon tetrachloride and water were used as solvents for extraction and back-extraction. Measurements were carried out after preparing sample solutions in 0.5 M sodium hydroxide in order to enhance the sensitivity. This high sensitive method (detection limit, 1 ppb) was applied to the determination of germanium in some medicinal plants. The analytical results obtained indicate that medicinal plants contain small amounts of germanium ; it appeared that there was no connection between the pharmacological effects of medicinal plants and their germanium contents.

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