Electrothermal vaporization system using furnace-fusion technique for the determination of lead in botanical samples by inductively coupled plasma atomic emission spectrometry

摘要

A new approach to sample digestion, subsequent vaporization an4 introduction into an inductively coupled plasma aiowi~ emission spectrometer was developed for the directs dptermination of lead. To each small sample cuvette mnde of tungsten, a mixture of a ground solid sample and powdered diammonium hydrogenphosphate was precisely weighed. The cuvette was positioned onto the tungszen boat furnace (TBF) incorporating a vaporizer. Tetramediyhmmonium hydroxide solution was added. Then the cuvette was heated and maintained at a wet-di-gestion temperature to decompose the solid sample. After digestion, due temperature was elevated to generate the analyte vapor for introduction into a plasma. Since the solid samples were wet-digested in the sample cuvettes before waIau~izazion, they could be analyzed by using a calibratiaa curve prepared from aqueous standard solu-tions. Tli~s hiethod was applied to the determination of lead in ~o~ipral biological materials with satisfactory. re-sults.