By Clarence Karr
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Extra resources for Analytical methods for coal and coal products, Volume 1
In "P hy sical M ethods in D eterm inative M in eralog y " (J. ). A cadem ic Press, N ew York. , and Berry, W. F. (1965). Preparation and P olishin g of Coal and Coke for Petro graphic A nalysis. , M onroeville, P ennsylvania, van G ijzel, P. (1971). In "S p o ro p o lle n in " (J. ). A cadem ic Press, New York. , and Virgos, J. M. (1977). J. Microsc. 109, 2 3 -2 8 . International C om m ittee for Coal Petrology (ICCP) (1963). "In ternational H an dbook of Coal P e tro lo g y ," 2nd ed. Centre de la Rech.
L)-(3) reflectances are expressed as fractions, not percentages. In practice, it is acceptable to determine the reflectance in oil of vitri nite by direct comparison with a reflectance standard and without re course to these equations, by assuming the refractive index of the im mersion oil. Figure 2 illustrates in the manner of Huntjens and van Krevelen (1954) how the maximum reflectance of vitrinite is dependent on both the maximum refractive and absorption indices. 0 it shows little further increase, and the absorption index becomes the principal controlling factor.
This state is called photochemical equilibrium, fading, or alteration by different workers. It is strongly suggested that quantita tive fluorometric work be carried out within as short a period as possi ble, preferably less than 1 min. Readers are referred to the articles mentioned previously for detailed methods of quantitative fluorospectrophotometry. VIII. PET R O G R A PH IC A N A LY SIS BY T H IN SE C T IO N T E C H N IQ U E S Early petrographic studies of coals in the United States employed strictly thin section techniques.
Analytical methods for coal and coal products, Volume 1 by Clarence Karr