title: Preparation and characterization of magnetic carboxylated nanodiamonds for vortex-assisted magnetic solid-phase extraction of ziram in food and water samples.
abstract: A simple and rapid vortex-assisted magnetic solid phase extraction (VA-MSPE) method for the separation and preconcentration of ziram (zinc dimethyldithiocarbamate), subsequent detection of the zinc in complex structure of ziram by flame atomic absorption spectrometry (AAS) has been developed. The ziram content was calculated by using stoichiometric relationship between the zinc and ziram. Magnetic carboxylated nanodiamonds (MCNDs) as solid-phase extraction adsorbent was prepared and characterized by Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD) spectrometry and scanning electron microscopy (SEM). These magnetic carboxylated nanodiamonds carrying the ziram could be easily separated from the aqueous solution by applying an external magnetic field; no filtration or centrifugation was necessary. Some important factors influencing the extraction efficiency of ziram such as pH of sample solution, amount of adsorbent, type and volume of eluent, extraction and desorption time and sample volume were studied and optimized. The total extraction and detection time was lower than 10min The preconcentration factor (PF), the precision (RSD, n=7), the limit of detection (LOD) and limit of quantification (LOQ) were 160, 7.0%, 5.3µgL(-1) and 17.5µgL(-1), respectively. The interference of various ions has been examined and the method has been applied for the determination of ziram in various waters, foodstuffs samples and synthetic mixtures.
authors.affiliation: Erciyes University, Faculty of Sciences, Department of Chemistry, 38039 Kayseri, Turkey.
authors.forename: Erkan
authors.initials: E
authors.lastname: Yılmaz
authors.affiliation: Erciyes University, Faculty of Sciences, Department of Chemistry, 38039 Kayseri, Turkey. Electronic address: soylak@erciyes.edu.tr.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D000327:Adsorption; D060766:Drinking Water / Q000032:analysis; D005506:Food Contamination / Q000032:analysis*; D005659:Fungicides, Industrial / Q000032:analysis* / Q000737:chemistry; D060106:Lakes / Q000737:chemistry; D060328:Magnetic Phenomena; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry; D058612:Nanodiamonds / Q000737:chemistry*; D012275:Oryza / Q000737:chemistry; D052616:Solid Phase Extraction; D014908:Triticum / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D015039:Ziram / Q000032:analysis* / Q000737:chemistry
chemical_list: D060766:Drinking Water; D005659:Fungicides, Industrial; D058185:Magnetite Nanoparticles; D058612:Nanodiamonds; D014874:Water Pollutants, Chemical; D015039:Ziram
keywords: Dithiocarbamate pesticides; Magnetic carboxylated nanodiamonds; Magnetic solid phase extraction; Zinc; Ziram