Determination of Cadmium by Graphite Furnace Atomic Absorption Spectrometry Using Ammonium Sulphate-Tris modifier

A method has been developed for the determination of Cd in enviromental and biological samples by platform graphite furnace atomic absorption spectrometry. Ammonium sulphate and tris-(hydroxymethyl)-aminomethane (Tris) were employed as a chemical modifier. The tolerable pyrolysis temperature for Cd was raised to 850℃ in the presence of modifier, the sensitivity for the determination of Cd was also improved if compared with that obtained by using (NH₄)₃PO₄-Mg(NO₃)₂ and (NH₄)₂PO₄-HNO₃ as chemical modifier.