title: Separation/preconcentration and determination of vanadium with dispersive liquid-liquid microextraction based on solidification of floating organic drop (DLLME-SFO) and electrothermal atomic absorption spectrometry.
abstract: A novel dispersive liquid-liquid microextraction based on solidification of floating organic drop (DLLME-SFO) for separation/preconcentration of ultra trace amount of vanadium and its determination with the electrothermal atomic absorption spectrometry (ETAAS) was developed. The DLLME-SFO behavior of vanadium (V) using N-benzoyl-N-phenylhydroxylamine (BPHA) as complexing agent was systematically investigated. The factors influencing the complex formation and extraction by DLLME-SFO method were optimized. Under the optimized conditions: 100 microL, 200 microL and 25 mL of extraction solvent (1-undecanol), disperser solvent (acetone) and sample volume, respectively, an enrichment factor of 184, a detection limit (based on 3S(b)/m) of 7 ng L(-1) and a relative standard deviation of 4.6% (at 500 ng L(-1)) were obtained. The calibration graph using the preconcentration system for vanadium was linear from 20 to 1000 ng L(-1) with a correlation coefficient of 0.9996. The method was successfully applied for the determination of vanadium in water and parsley.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Yazd University, Safaeieh, Yazd 89195-741, Iran.
authors.forename: Tahereh
authors.initials: T
authors.lastname: Asadollahi
authors.forename: Shayessteh
authors.initials: S
authors.lastname: Dadfarnia
authors.forename: Ali Mohammad Haji
authors.initials: AM
authors.lastname: Shabani
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D006898:Hydroxylamines / Q000737:chemistry; D012492:Salts / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013696:Temperature; D013997:Time Factors; D014639:Vanadium / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D006898:Hydroxylamines; D012492:Salts; D012997:Solvents; D014639:Vanadium; C071190:N-benzoyl-N-phenylhydroxylamine