DETERMINATION OF CADMIUM BY ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROMETRY USING PALLADIUM AND TARTARIC ACID AS A MIXED CHEMICAL MODIFIER AND A TUNGSTEN-FOIL PLATFORM WITH THE POSSIBILITY OF STANDARDLESS ANALYSIS

Palladium and tartaric acid as a mixed chemical modifier is a better m odifier for the determination of Cd in complex environmental samples t han Pd and tartaric acid (or ascorbic acid) used as separate modifiers . The mixed modifier can effectively eliminate matrix effects and the two peak signals observed in the atomization of complex environmental samples. It has also been found that a W-foil platform has a longer li fetime than a Ta-foil platform. A comparison of the calculated and exp erimental values obtained for the characteristic mass, m0, with a W-fo il platform in a pyrolytic graphite coated graphite tube using a mixed modifier shows that an atomization temperature higher than T(set) = 1 673 K and T(effective) = 1530 K can be used for the determination of C d. Quantitative analytical data for Cd in sea-water and in solutions o f reference materials (pork liver, wheat powder, peach leaf, tea leaf, tea tree leaf, cabbage, water sediments, coal fly ash, soils and rock ) by standardless analysis are presented (LOD = 0.3pg; RSD<5%).