Methods for the Determination of As, Cd, and Pb in Potato Slurry Using Multivariate Optimization and Graphite Furnace Atomic Absorption Spectrometry

摘要

This study presents the development and validation of a method for the determination of arsenic (As), cadmium (Cd), and lead (Pb) in potato slurry samples using graphite furnace atomic absorption spectrometry (GFAAS) after multivariate optimization. The slurries were prepared by cryogenic grinding, sieving, and addition of 2% (v/v) nitric acid and 1% (v/v) hydrogenous peroxide up to a 2-mL volume. The slurries were kept homogeneous using air bubbling with an aquarium pump. Iridium (500 mu g) and titanium were the best permanent modifiers for As, Cd, and Pb. Factorial design was used to obtain the best modifiers, pyrolysis and atomization temperatures for all analytes. After that a central composition design (CCD) was made, to obtain the best pyrolysis and atomization temperatures.