Slurry sampling for electrothermal AAS determination of cadmium in seafoodproducts

The slurry sampling approach including platform atomization; matrix modific ation, by using (NH4)2HPO(4); and slurry stabilization by adding Triton X-1 00 as a dispersant agent, was used for - the cadmium determination in seafo od products, tuna and shellfish (mussels, crams and cockles) slurries, and several seafood product reference materials (DORM-1, DOLT-1 and CRM-278) sl urries by ETAAS. A pyrolysis temperature of 600 degrees C was obtained by u sing (NH4)2HPO(4) at a concentration of 50 mg L-1. The use of oxygen as the purge gas during the pyrolysis step was not necessary. The optimum atomiza tion temperature obtained was 1200 degrees C. Aqueous calibration was possi ble for the determination of cadmium in tuna, clam and cockle slurries; how ever, it was not considered adequate for mussel slurries. It was found that calibration using the standard addition method is better. The good precisi on and accuracy of the procedure is illustrated by the results obtained for the reference materials, tuna and mussel samples.