In this study, a new Co3O4 nanoparticles (NPs) coated with sodium dodecyl sulphate (SDS) is developed for preconcentration of trace amounts of cadmium ions (Cd 2+) as a prior step to its determination by flame atomic absorption spectrometry (FAAS). The effects of various parameters, including pH of sample solution, amount of sorbent, flow rates of solution and eluent, sample volume, type, and least amount of the eluent for elution of the Cd 2+ from Co3O4 NPs were studied and optimized. Experimental conditions for effective separation of trace levels of the Cd 2+were optimized with respect to different experimental parameters in Column method. Under the best experimental conditions, the calibration curve was linear in the range of 1.0–500.0 ng.mL−1 of cadmium (Cd) with R2 = 0.999. The detection limit was 0.4ng.mL−1 in the original solution (3Sb/m) and the relative standard deviation for eight replicate determination of 0.1μg.mL−1 Cd was ±2.1%. The method was validated by the analysis of a certified reference material with the results being in agreement with those quoted by manufactures. The developed method was successfully applied to the extraction and determination of Cd in water and food samples with satisfactory results.
