1987 Volume 36 Issue 5 Pages 330-334
A simple, rapid and sensitive method for the determination of V in environmental materials by polarized Zeeman AAS using pyrolytic graphite furnace was described. The sensitivity of V was increased by using an optical temperature control system in the atomizing process. When 10 mm3 of sample solution was injected into the pyrolytic graphite furnace, the optimum conditions obtained at heating stages were: drying for 90 s programmed from 100 to 160°C, charring at 400°C for 30 s, atomizing at 2850°C for 30 s and cleaning at 2950°C for 7 s. A linear calibration curve was obtained in the range of 0.253 ng of V. The detection limit was 0.06 ng and the relative standard deviation was about 2% for 0.2 ppm of V in 3% sodium carbonate solution. V concentrations in several environmental reference materials were determined as follows. The powdered sample was fused with sodium carbonate for a desired period, and V in the melt was dissolved in hot water. The solution was filtered through a glass fiber filter (Toyo GC-90), then the filtrate was made up 50 cm3 with water. The absorbance of V was measured at 318.4 nm with injection volume of 10 mm3 employing a standard addition method. The analytical results obtained by the proposed procedure were in good agreement with the certified/recommended values.
