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Olajire,A.A., AmeenA.B., Abdlil-Hammed,M., Adek2la, F.A.,2007.”Occurrence and Distribution of Metals and Porhyrins in Nigerian Coal Minerals” Journal of Fuel chemistry and technology, Vol.35, No.6, pp.641-647.

has been cited by the following article:

• TITLE: Analytical Study of Two Differently Ranked Coals Using UV-VIS-NIR Spectroscopy

  AUTHORS: B. Manoj, A.G. Kunjomana

  KEYWORDS: UV-VIS-NIR spectroscopy, Coal characterization, chemical leaching, proximateanalysis.

  JOURNAL NAME: Journal of Minerals and Materials Characterization and Engineering, Vol.10 No.10, August 10, 2011

  ABSTRACT: The characterization of Indian bituminous and subbituminous coal was performed by UVVisible– NIR spectroscopy. Chemical leaching with varying concentration of hydrofluoric acid was conducted on both the samples. Electronic absorption at this region was higher for higher ranked coals. Chemical leaching increased electronic transitions in subbituminous coal with maximum transitions for HF (10%) leached samples. The absorption maximum of benzeneoxygen system was found between 235-270 nm and was showing a red shift with leaching. The characteristic naphthalene ring systems (220 & 280 nm) were masked by the absorption regions of monoaromatic rings; indicating the content of napthalenoid hydrocarbon was very low. The bands observed in the visible region (450nm) were attributed to SO2 in the sample and was showing a red shift. The weak band at the 680 nm was attributed to the Ⅱ-Ⅱ* electronic transitions of the polynuclear aromatic hydrocarbons which also showed red shift with leaching. It was found that the ash content is reduced by 87.5% & 76.2% in bituminous and subbituminous coal respectively with HF (30%) leaching.