Direct determination of Cd and Pb in edible oils by atomic absorption spectrometry with transverse heated filter atomizer

Abstract

A transverse heated filter atomizer (THFA) was employed for the direct determination of Cd and Pb in edible oils, using a PerkinElmer atomic absorption spectrometer (SIMAA-6000). Twelve samples of olive, avocado, grape seed, sunflower, salad and cooking oils were examined. The determination was performed directly, after sample dilution with n-heptane. The metal–organic standard in oil, Conostan S-21, was employed for calibration. Results of determination were verified using the external calibration and analyte addition methods. Reduction of spectral and chemical interferences from the organic matrix, and reduction of losses of the analyte as volatile compounds, provided limits of detection of 0.06 and 0.7 μg L⁻¹ for Cd and Pb, respectively, with the lowest recovery of the analyte above 60%. Omission of chemical modification, a shorter thermal program and stability of analytical signals during 600–700 temperature cycles within 15% deviation with the use of single filter, represent additional advantages in application of AA spectrometry with THFA atomizer for food analysis.