Vortex-Assisted Solidified Floating Organic Drop Microextraction of Molybdenum in Beverages and Food Samples Coupled with Graphite Furnace Atomic Absorption Spectrometry

A simple, rapid, sensitive, and selective vortex-assisted solidified floating organic drop microextraction (VA-SFODME) method was developed for the determination of molybdenum in beverages and food samples by using graphite furnace atomic absorption spectrometry (GFAAS). 4-Amino-3-hydroxy-1-naphthalenesulfonic acid (AHNA) was used as complexing reagent. 1-Undecanol was used as extraction solvent. Analytical parameters were investigated and optimized as pH 5, ligand amount 1 mg, volume of 1-undecanol 100 mu L, extraction time 4 min, and sample volume 20 mL. Under optimum conditions, enrichment factor (EF) and limit of detection (LOD) for Mo(VI) were found to be 133 and 10 ng L-1, respectively. The relative standard deviation (RSD) was found to be 2.5 %. Matrix effects of some cations, anions, and transition metal ions were also investigated. The accuracy of the VA-SFODME method was confirmed by the analysis of certified reference materials (NIST SRM 1568a rice flour, GBW 07605 tea, and NIST SRM 1577b bovine liver). Optimized method was successfully applied to beverages and food samples after microwave digestion method.