Modified iron oxide nanoparticles as solid phase extractor for spectrophotometeric determination and separation of basic fuchsin

This study presents a novel separation, preconcentration and determination of basic fuchsin (BF) in an aqueous solution by sodium dodecyl sulfate (SDS)-bounded iron oxide nanoparticles(S-IONPs). It is shown that the novel magnetic nano-adsorbent is quite efficient for the adsorption and desorption of BF at 25 degrees C. Different parameters such as pH. temperature, ionic strength and composition of desorbent solvent were optimized. The effect of some co-existing ions on the determination was investigated. The nanoparticles were analyzed by transmission electron microscopy (TEM) and the sizes of S-IONP's were in the range of 20-100 nm. The method showed good linearity for the determination of BF in the range of 10-300 ng mL(-1) with a regression coefficient of 0.9989. The limit of detection (LOD) (signal-to-noise ratio of 3:1) was 0.0073 Lg L-1 and the relative standard deviation (RSD) for 0.03 mu g mL(-1) and 0.2 Kg mL(-1) of BF Were 4.53% and 4.73%, respectively. The BF was determined successfully in spiked samples of Karoon River water. (C) 2008 Elsevier B.V. All rights reserved.