Se estudiaron 100 muestras de Pleurotus ostreatus procedentes de distintos establecimientos minoristas de alimentacion de la ciudad de Cordoba durante los anos 1995 y 1996, en las que se determino la humedad y se detecto en el 6 por ciento un posible fraude por adicion de agua.

The present study explores the biosorption potential of Pleurotus ostreatus immobilized magnetic iron oxide nanoparticles for solid-phase extractions of Ni(II) and Pb(II) ions from the water and food samples. It was characterized using FTIR, FE-SEM/EDX before and after analyte ions biosorption. Important operational parameters including the effect of initial pH, the flow rate of the sample solution and volume, amount of biomass and support material, interfering ions, best eluent, column reusability were studied. The biosorption capacities of fungus immobilized iron oxide nanoparticles were found as 28.6 and 32.1 mg g⁻¹ for Ni(II) and Pb(II), respectively. The limit of detection (LOD) and limit of quantitation (LOQ) were achieved as 0.019 and 0.062 ng mL⁻¹ for Ni(II), 0.041 and 0.14 ng mL⁻¹ for Pb(II), respectively. The proposed method was validated by applying to certified reference materials and successfully applied for the preconcentrations of Ni(II) and Pb(II) ions from water and food samples by ICP-OES.

Se estudiaron 100 muestras de Pleurotus ostreatus procedentes de distintos establecimientos minoristas de alimentacion de la ciudad de Cordoba durante los anos 1995 y 1996, en las que se determino la humedad y se detecto en el 6 por ciento un posible fraude por adicion de agua.