title: Preparation and characterization of magnetic nanoparticles for the on-line determination of gold, palladium, and platinum in mine samples based on flow injection micro-column preconcentration coupled with graphite furnace atomic absorption spectrometry.
abstract: A simple and highly selective procedure for on-line determination of trace levels of Au, Pd, and Pt in mine samples has been developed using flow injection-column adsorption preconcentration coupled with graphite furnace atomic absorption spectrophotometry (FI-column-GFAAS). The precious metals were adsorbed on the as-synthesized magnetic nanoparticles functionalized with 4'-aminobenzo-15-crown-5-ether packed into a micro-column and then eluted with 2% thiourea + 0.1 mol L(-1) HCl solution prior to the determination by GFAAS. The properties of the magnetic adsorbents were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). Various experimental parameters affecting the preconcentration of Au, Pd, and Pt were investigated and optimized. Under the optimal experimental conditions, the detection limits of the developed technique were 0.16 ng mL(-1) for Au, 0.28 ng mL(-1) for Pd, and 1.01 ng mL(-1) for Pt, with enrichment factors of 24.3, 13.9, and 17.8, respectively. Precisions, evaluated as repeatability of results, were 1.1%, 3.9%, and 4.4% respectively for Au, Pd, and Pt. The developed method was validated by the analysis of Au, Pd, and Pt in certified reference materials and mine samples with satisfactory results.
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, PR China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Ye
authors.forename: Shuxia
authors.initials: S
authors.lastname: Liu
authors.forename: Miaomiao
authors.initials: M
authors.lastname: Tian
authors.forename: Wanjun
authors.initials: W
authors.lastname: Li
authors.forename: Bin
authors.initials: B
authors.lastname: Hu
authors.forename: Weihong
authors.initials: W
authors.lastname: Zhou
authors.forename: Qiong
authors.initials: Q
authors.lastname: Jia
mesh_terms: D000814:Aniline Compounds; D047248:Crown Compounds; D017022:Flow Injection Analysis; D019015:Geologic Sediments / Q000032:analysis*; D006046:Gold / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008906:Mining; D009862:Online Systems; D010165:Palladium / Q000032:analysis*; D010984:Platinum / Q000032:analysis*; D013054:Spectrophotometry, Atomic; D014961:X-Ray Diffraction; D043844:Crown Ethers
chemical_list: D000814:Aniline Compounds; D047248:Crown Compounds; D006046:Gold; D006108:Graphite; D058185:Magnetite Nanoparticles; D010165:Palladium; D010984:Platinum; C526639:4'-aminobenzo-15-crown-5; D043844:Crown Ethers
keywords: Crown ether-functionalized magnetic nanoparticles; Flow injection; Graphite furnace atomic absorption spectrophotometry; Precious metals; Preconcentration