Aspartic acid-modified magnetic nanoparticles as an ideal sorbent for solid phase extraction of Pb in water samples prior to ICP-OES determination

Abstract

AbstractThe present study will consider the application of aspartic acid-coated Fe3O4 as a sorbent for solid-phase extraction of trace amounts of Pb using inductively coupled plasma optical emission spectrometry. Magnetic nanoparticles (MNPs) of Fe3O4 possess a high potential for modification with different organic and inorganic compounds. Using an amino acid (in this case, aspartic acid) as a nontoxic modifier, without an organic solvent, could provide a number of environmentally friendly applications in the field of green chemistry. By using modified MNPs as a sorbent, the separation of metal ions from an aqueous sample solution was easily performed by an external magnet without centrifuging or filtering. An elution step was accomplished by using a 2 mol L−1 nitric acid solution for introducing the desorbed analyte to ICP-OES. Different parameters influencing on the extraction efficiency, such as pH, volume of the modifier, extraction and elution time, types and concentrations of eluent were investigate...