RAPID PROCEDURES FOR COBALT AND NICKEL DETERMINATION IN SLURRIED FOOD SAMPLES BY ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY

摘要

Electrothermal atomic absorption spectrometric (ETAAS) procedures are discussed for the rapid determination of cobalt and nickel in slurried food samples. The suspension medium, containing 0.025% of Triton X-100, 1% nitric acid, and 10% hydrogen peroxide, was used to prevent buildup of carbonaceous residue inside the atomizer. Wall atomization was carried out, allowing calibration with aqueous standards. Detection limits were 36 and 42 ng/g for cobalt and nickel, respectively. A mild calcination procedure is also proposed for materials containing low cobalt concentrations (detection limit 4 ng/g cobalt). The accuracy of the results was checked against three standard reference materials. [References: 12]