title: Graphite furnace atomic absorption spectrometric detection of vanadium in water and food samples after solid phase extraction on multiwalled carbon nanotubes.
abstract: Vanadium(V) ions as 8-hydroxyquinoline chelates were loaded on multiwalled carbon nanotubes (MWNTs) in a mini chromatographic column. Vanadium was determined by graphite furnace atomic absorption spectrometry (GFAAS). Various analytical parameters including pH of the working solutions, amounts of 8-hydroxyquinoline, eluent type, sample volume, and flow rates were investigated. The effects of matrix ions and some transition metals were also studied. The column can be reused 250 times without any loss in its sorption properties. The preconcentration factor was found as 100. Detection limit (3 s) and limit of quantification (10 s) for the vanadium in the optimal conditions were observed to be 0.012 µg L(-1) and 0.040 μg L(-1), respectively. The capacity of adsorption was 9.6 mg g(-1). Relative standard deviation (RSD) was found to be 5%. The validation of the method was confirmed by using NIST SRM 1515 Apple leaves, NIST SRM 1570a Spinach leaves and GBW 07605 Tea certified reference materials. The procedure was applied to the determination of vanadium in tap water and bottled drinking water samples. The procedure was also successfully applied to microwave digested food samples including black tea, coffee, tomato, cabbage, zucchini, apple and chicken samples.
authors.affiliation: Gaziosmanpasa University, Faculty of Science and Arts, Chemistry Department, 60250 Tokat, Turkey; National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan.
authors.forename: Sham Kumar
authors.initials: SK
authors.lastname: Wadhwa
authors.forename: Mustafa
authors.initials: M
authors.lastname: Tuzen
authors.forename: Tasneem
authors.initials: T
authors.lastname: Gul Kazi
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D000818:Animals; D002645:Chickens; D004785:Environmental Pollutants / Q000302:isolation & purification*; D017743:Equipment Reuse; D005618:Fresh Water / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D027845:Malus / Q000737:chemistry; D008460:Meat / Q000032:analysis*; D008567:Membranes, Artificial; D037742:Nanotubes, Carbon / Q000737:chemistry; D015125:Oxyquinoline / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*; D013054:Spectrophotometry, Atomic; D018724:Spinacia oleracea / Q000737:chemistry; D013662:Tea / Q000737:chemistry; D014639:Vanadium / Q000302:isolation & purification*
chemical_list: D004785:Environmental Pollutants; D008567:Membranes, Artificial; D037742:Nanotubes, Carbon; D013662:Tea; D014639:Vanadium; D015125:Oxyquinoline
keywords: 8-hydroxyquinoline; Atomic absorption spectrometry; Multiwalled carbon nanotubes; Solid phase extraction; Vanadium