ASTM Standard
D2234/D2234M Practice for Collection of a Gross Sample of Coal

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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  • segregation variance of increment collection — Ss2, n the variance caused by nonrandom distribution of ash content or other constituent in the lot. For a method of estimating this variance, see Annex A1 of Test Methods D2234/D2234M. D2234/D2234M …   Coke&Coal Terminology

  • air drying — n a process of partial drying of coal to bring its moisture near to equilibrium with the atmosphere in the room in which further reduction and division of the sample will take place. D2013; D2234/D2234M …   Coke&Coal Terminology

  • analysis sample — n final subsample prepared from the original gross sample but reduced to 100 % through No. 60 (250 µm) sieve and divided to not less than 50 g. D2013; D2234/D2234M …   Coke&Coal Terminology

  • error — difference of an observation from the best obtainable estimate of the true value. D2234/D2234M; D4916 …   Coke&Coal Terminology

  • free impurity — n the impurities in a coal that exist as individual discrete particles that are not a structural part of the coal and that can be separated from it by coal preparation methods. D2234/D2234M …   Coke&Coal Terminology

  • gross sample — n a sample representing one lot of coal and composed of a number of increments on which neither reduction nor division has been performed. D2013; D2234/D2234M …   Coke&Coal Terminology

  • increment — n a small portion of a lot collected by one operation of a sampling device and normally combined with other increments from the lot to make a gross sample. D2234/D2234M; D4916 …   Coke&Coal Terminology

  • inherent ash — n the residue remaining from the inherent impurities after ignition under conditions specified for the ash determination. D2234/D2234M …   Coke&Coal Terminology

  • inherent impurity — n the inorganic material in coal that is structurally part of the coal and cannot be separated from it by coal preparation methods. D2234/D2234M …   Coke&Coal Terminology

  • lot — n a discrete quantity of coal for which the overall quality to a particular precision needs to be determined. D2234/D2234M …   Coke&Coal Terminology

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