DIRECT DETERMINATION OF THE VANADIUM CONTENT OF LIGNITE BY ATOMIC-ABSORPTION SPECTROMETRY USING A GRAPHITE-FURNACE ATOMIZER AND A SOLID SAMPLE

Citation
B. Ergenoglu et A. Olcay, DIRECT DETERMINATION OF THE VANADIUM CONTENT OF LIGNITE BY ATOMIC-ABSORPTION SPECTROMETRY USING A GRAPHITE-FURNACE ATOMIZER AND A SOLID SAMPLE, Fuel, 73(4), 1994, pp. 629-631
Citations number
26
Categorie Soggetti
Energy & Fuels","Engineering, Chemical
Journal title
FuelACNP
ISSN journal
00162361
Volume
73
Issue
4
Year of publication
1994
Pages
629 - 631
Database
ISI
SICI code
0016-2361(1994)73:4<629:DDOTVC>2.0.ZU;2-N
Abstract
The vanadium content of lignite is directly determined using powdered samples and a graphite furnace atomizer. Powdered lignite samples were standardized by the standard addition method and mixed with graphite powders; they were then introduced into the furnace using a simple met allic bar with a cavity in it. Absorbance-concentration ratios of orig inal and standardized lignite samples were different. However, upon mi xing with a proper amount of graphite powder, the absorbance-concentra tion ratio of the lignite samples approached the same limiting value. Spectral interference of Al was observed at 318.4 nm, at which atomic absorption of V is measured. However, since Al is more volatile than V , signals due to Al disappear before signals of V reach their peak hei ght. Therefore, accuracy of V determination is not affected by the pre sence of Al in the sample.