title: Dithizone-modified graphene oxide nano-sheet as a sorbent for pre-concentration and determination of cadmium and lead ions in food.
abstract: Graphene oxide nano-sheet was modified with dithizone as a novel sorbent for selective pre-concentration and determination of Cd(II) and Pb(II) in food. The sorbent was characterised by various analytical methods and the effective parameters for Cd(II) and Pb(II) adsorption were optimised during this work. The high adsorption capacity and selectivity of this sorbent makes the method capable of fast determinations of the Cd(II) and Pb(II) content in complicated matrices even at μg l(-1) levels using commonly available instrumentation. The precision of this method was < 1.9% from 10 duplicate determinations and its accuracy verified using standard reference materials. Finally, this method was applied to the determination of Cd(II) and Pb(II) ions in common food samples and satisfactory results were obtained.
authors.affiliation: a Department of Chemical Engineering , South Tehran Branch, Islamic Azad University , Tehran , Iran.
authors.forename: Hamid Reza
authors.initials: HR
authors.lastname: Moghadam Zadeh
authors.affiliation: a Department of Chemical Engineering , South Tehran Branch, Islamic Azad University , Tehran , Iran.
authors.forename: Parvaneh
authors.initials: P
authors.lastname: Ahmadvand
authors.affiliation: a Department of Chemical Engineering , South Tehran Branch, Islamic Azad University , Tehran , Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Behbahani
authors.affiliation: b Department of Chemistry, Faculty of Science , Shahid Beheshti University , G.C. Tehran , Iran.
authors.forename: Mostafa M
authors.initials: MM
authors.lastname: Amini
authors.affiliation: c School of Civil and Environmental Engineering , University of New South Wales , Sydney , Australia.
authors.forename: Omid
authors.initials: O
authors.lastname: Sayar
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000032:analysis*; D004230:Dithizone / Q000737:chemistry*; D005504:Food Analysis; D005506:Food Contamination / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D007854:Lead / Q000032:analysis*; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D007477:Ions; D010087:Oxides; D002104:Cadmium; D007854:Lead; D004230:Dithizone; D006108:Graphite
keywords: cadmium; dithizone; food samples; graphene; lead