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The adsorption properties of nanometer-size TiO_ 2 for V(Ⅴ) were studied. The adsorption rate could reach above 99% when the pH values were at the range of 4-10. The adsorption balance time was 10 min , the saturation capacity of adsorption of nanometer-size TiO_ 2 to V(Ⅴ) was 6.43 mg per gram. Using 2 mL 1.5 mol5L~ -1 NaOH as elution, we found the elution rate could reach 95%. A novel method of extreme-trace V(Ⅴ) preconcentration with nanometer-size titanium dioxide and determination by graphite furnace atomic absorption spectroscopy (GFAAS) was advanced. The detection limit(3σ)of the method was 0.61 μg5L~ -1, and the relative standard deviation was 8.1% (n=6) of 2.5 μg5L~ -1 V(Ⅴ). Environmental samples experiments were also conducted to test the feasibility of the method, and it came out that the recovery rates were between 91.2% and 102.0%.
The adsorption properties of nanometer-size TiO 2 for V (V) were studied. The adsorption rate could reach above 99% when the pH values were at the range of 4-10. The adsorption balance time was 10 min, the saturation capacity of adsorption of nanometer-size TiO 2 to V (V) was 6.43 mg per gram. Using 2 mL 1.5 mol 5L ~ -1 NaOH as elution, we found the elution rate could reach 95%. A novel method of extreme-trace The detection limit (3σ) of the method was 0.61 μg 5L ~ -1, and the relative standard deviation was (Vσ) preconcentration with nanometer-size titanium dioxide and determination by graphite furnace atomic absorption spectroscopy (GFAAS) was advanced. 8.1% (n = 6) of 2.5 μg 5L ~ -1 V (Ⅴ). Environmental samples experiments were also conducted to test the feasibility of the method, and it came out that the recovery rates were between 91.2% and 102.0% .