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A new procedure is reported for arsenic preconcentration in juvenile eyeshadow using maghemite nanoparticles (γ-Fe 2 O 3 ) and determination by flow injection analysis – hydride generation atomic absorption spectrometry (FIA-HG-AAS). Maghemite nanoparticles were synthesized and characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and N 2  adsorption measurements at −196 °C. The results showed a crystalline size of 9.1 nm and a surface area of 106 m 2  g −1 . The experimental conditions for the hydride generation system and the preconcentration process were optimized using a central composite design. For hydride generation, the levels of the concentration of the factors HCl, NaBH 4,  and flow of carrier gas were optimized, with optimal conditions of 4 mol L −1 , 1.1% (m/v), and 145 mL min −1 , respectively. The optimized conditions obtained for the adsorption process were a pH equal to 5.3, a mass of γ-Fe 2 O 3  of 184 mg, and stirring time of 41 min in the presence of the sample matrix. The enrichment factor was 50, and the limit of detection was 0.9 μg g −1 . Recovery values ranged from 75 to 99%.

analytical letters

Ultrasensitive Determination of Arsenic in Juvenile Eyeshadow by Novel Dispersive Magnetic Solid-Phase Extraction (MSPE) and Flow Injection Analysis – Hydride Generation Atomic Absorption Spectrometry (FIA-HG-AAS)