Mostafa Mehrdadi - ۱Department of Chemistry, Faculty of Science, Islamic Azad University – science and research branch, Arak
Majid Ramezani - Department of Chemistry, Faculty of Science, Islamic Azad University –Arak branch, Arak, Iran
Ali Niaz - Department of Chemistry, Faculty of Science, Islamic Azad University –Arak branch, Arak, Iran

A rapid, simple and sensitive magnetic solid phase extraction method was developed for thepreconcentration and determination of palladium ions in water samples. In this study, palladium ions formcomplexes with 5-(4-Dimethylaminobenzylidene) rhodanine(DMR) and then are quantitatively extracted tothe surface of sodium dodecyl sulfate (SDS)-coated magnetite nanoparticles (Fe3O4 NPs) in a batch processand then analysis by flame atomic absorption spectrometry (FAAS). The effect of different parameters suchas pH of sample, concentrations of DMR, amounts of SDS and Fe3O4 NPs, contact time and interfering ionson the removal of palladium ions were studied. Salt addition has a negative effect on the removal efficiencyof the metal ions, thus extraction follows the ion exchange mechanism. Under optimum conditions, thecalibration curve was linear in the range of 50 - 1250 μg L-1 with R2= 0.9985. Detection and relative standarddeviation of the proposed method were 20 μg L-1and 2.87 %, respectively. The adsorption data wereanalyzed by Langmuir and Freundlich isotherm models and a maximum adsorption amount of 344.83 mg g-1and a Langmuir adsorption equilibrium constant of 0.0115 Lmg-1 and Freundlich constant (Kf) 5.84 and (n)1.26 were obtained. Finally, this adsorbent was successfully used for removal of palladium from severalenvironmental water samples.

palladium;Magnetite nanoparticles;Wastewaters;Removal;Sodium dodecyl sulphate