Abstract
This study is focused on the speciation of selected elements in oil ash. Our efforts weredirected primarily to obtain information on the various forms of vanadium, chromium and nickel.One sample was characterized via its total composition and via its capacity for releasing variouselements. The latter was estimated by hot water and nitric acid extractions. A rapid cold waterextraction technique has been developed and utilized for sample preparation prior to aqueousspeciation by high pressure ion chromatography (HPIC).
Results of the HPIC measurements, in agreement with electron spin resonance (ESR)investigations performed on the solid sample, indicate that 38% of the vanadium is present asVOSO4, 58% of the chromium is Cr2(SO4)3 and 30% of the nickel is NiSO4. The pH and theredox potential values of the cold water extract support the existence of these forms. Results of ageneric study with successive fractionation extractions show the probable existence of oxides,associations with organic matter and aluminosilicate minerals.
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Achilli, M., Zoboli, A., Gács, I. et al. Speciation of Selected Minor and Major Elements in Oil Ash I. Operationally Defined Chemical Associations and Aqueous Speciation. Water, Air, & Soil Pollution 93, 285–302 (1997). https://doi.org/10.1023/A:1022122330061
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DOI: https://doi.org/10.1023/A:1022122330061