STANDARDLESS ANALYSIS IN ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROSCOPY WITH PD AS MATRIX MODIFIER - COMPARISON OF A NEW ATOMIZATION SYSTEM WITH A COMMERCIAL SYSTEM IN THE DETERMINATION OF PB AND CD IN FRUIT JUICE

A new atomization system, previously proposed for standardless analysi s, is compared with a commercial system in the determination of Pb and Cd in fruit juice with Pd as matrix modifier. It is concluded that, i n addition to an increase in sensitivity, the new atomization system h as a response independent of the matrix. Therefore, no calibration is necessary except for a knowledge of the spectroscopic constant of the line used. Naturally the atomization must be such that all the atoms i njected are simultaneously present in the atomizer. In the commercial system on the other hand, the calibration curve is dependent on the ty pe and concentration of the matrix modifier.