Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10558592 | Spectrochimica Acta Part B: Atomic Spectroscopy | 2005 | 7 Pages |
Abstract
A sensitive and simple method for low temperature electrothermal vaporization inductively coupled plasma optical emission spectrometry (ETV-ICP-OES) determination of V(IV) and V(V) after separation/preconcentration by a micro-column packed with immobilized thenoyltrifluoroacetone (TTA) on microcrystalline naphthalene has been developed. Thenoyltrifluoroacetone was used as both a chelating agent for micro-column separation/preconcentration and a chemical modifier for ETV-ICP-OES determination of vanadium. Both vanadium species could be trapped by micro-column at pH 4.0, and the vanadate (VO2+) ion could be collected selectively at pH 2.4. Solid material loaded with analyte in the micro-column was dissolved with 100 μL of acetone containing 2.0 mmol Lâ1 TTA and the vanadium was determined subsequently by ETV-ICP-OES. The concentration of vanadyl (VO2+) ion was calculated by subtracting the vanadate concentration from the total concentration of vanadium. Under the optimized experimental conditions, the detection limit (3Ï) for the preconcentration of 5 mL of aqueous solution is 0.068 μg Lâ1 for both species and the relative standard deviations were 4.3% for vanadium(V) and 4.8% for vanadium(IV) (c=10 μg Lâ1, n=7), respectively. The method was applied successfully to the determination of vanadium(IV) and vanadium(V) in natural water samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Zhefeng Fan, Bin Hu, Zucheng Jiang,