As sample-preparation techniques for infrared spectroscopy evolved, research workers in coal chemistry were quick to investigate the potential of each. Each of these had something to recommend it and each had some disadvantage. At times, both mulls and alkali halide disks have exhibited excessive scattering, and, in other instances, have yielded good spectra only after long periods of grinding, often under selected solvents. But even after a sample was prepared and its spectrum recorded, the interpretation was complicated by the presence of a large amount of carbon. In fact, the presence of a large amount of highly absorbing carbon detracts from the spectrum by imposing attenuation requirements on the reference beam. In addition, some organic components have reacted with alkali halide disks, and, in some cases, spurious water bands have been reported.
KeywordsReference Beam Bituminous Coal Carbonyl Region Infrared Spectrophotometry Good Spectrum
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