title: Separation-preconcentration of nickel and lead in food samples by a combination of solid-liquid-solid dispersive extraction using SiO2 nanoparticles, ionic liquid-based dispersive liquid-liquid micro-extraction.
abstract: A microextraction method for the determination of nickel and lead using solid-liquid-solid dispersive extraction followed by ionic liquid-based dispersive liquid-liquid microextraction (SLSDE-ILDLLME) was presented. It was applied to the extraction of nickel and lead from food samples. Ammonium pyrrolidine dithiocarbamate (APDC) as complexing agent, [C4MIM][PF6] as ionic liquid, SiO2 as nanoparticles and 2 mol L(-1) HNO3 as eluent were used. Several important parameters such as amount of IL, extraction time, pH and volume of the complexing agent were investigated. The quantitative recoveries were obtained at pH 7.0 for analytes. Under the optimum conditions, the limits of detection (LODs) calculated using 3(Sd)blank/m were 0.17 for Ni(II) and 0.79 µg L(-1) for Pb(II) for aqueous solutions with 125 enrichment factor (EF). The limit of detections of the analyte ions (3(Sd)blank/m) for solid samples were 0.09 µg g(-1) (Ni) and 0.40 µg g(-1) (Pb). The accuracy of the proposed method was confirmed by the analysis of standard reference material (1577c bovine liver) and spiked recovery test. The proposed method was applied to determine nickel and lead levels in chicken, fish and meat samples.
authors.affiliation: Erciyes University, Fen Faculty, Department of Chemistry, 38039 Kayseri, Turkey; PCSIR Laboratories, Karachi, Pakistan.
authors.forename: Nusrat
authors.initials: N
authors.lastname: Jalbani
authors.affiliation: Erciyes University, Fen Faculty, Department of Chemistry, 38039 Kayseri, Turkey. Electronic address: soylak@erciyes.edu.tr.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D000818:Animals; D002417:Cattle; D002645:Chickens; D005399:Fishes; D005504:Food Analysis / Q000379:methods*; D052578:Ionic Liquids / Q000737:chemistry*; D007854:Lead / Q000032:analysis* / Q000302:isolation & purification*; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000379:methods; D008460:Meat / Q000032:analysis; D053768:Metal Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000032:analysis* / Q000302:isolation & purification*; D012822:Silicon Dioxide / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000379:methods; D013054:Spectrophotometry, Atomic
chemical_list: D052578:Ionic Liquids; D007854:Lead; D012822:Silicon Dioxide; D009532:Nickel
keywords: Ammonium pyrrolidine dithiocarbamate; Ionic liquid; Lead; Microextraction; Nickel; SiO(2) nanoparticle