ISO 21644:2021 pdf download – Solid recovered fuels — Methods for the determination of biomass content.
3.2 biogenic produced in natural processes by living organisms but not fossilized or derived from fossil resources 3.3 biomass material of biological origin excluding material embedded in geological formations and/or fossilized [SOURCE: ISO 16559:2014, 4.32, modified — Notes 1 and 2 to entry have been removed.] 3.4 calorific? value quantity of heat produced by the complete combustion, at a constant pressure equal to 1 013,25 mbar, of a unit volume or mass of gas, the constituents of the combustible mixture being taken at reference conditions and the products of combustion being brought back to the same conditions [SOURCE: EN 437: 2018, modified — Second paragraph (the list) has been removed.] 3.5 gross? calorific? value calorific value where the water produced by combustion is assumed to be condensed [SOURCE: ISO 21637:2020, 3.34] 3.6 isotope abundance fraction of atoms of a particular isotope of an element 3.7 laboratory sample part of the sample (3.13) sent to or received by the laboratory Note 1 to entry: When the laboratory sample is further prepared (reduced) by subdividing, mixing, grinding, or by combinations of these operations, the result is the test sample. When no preparation of the laboratory sample is required, the laboratory sample is the test sample. A test portion is removed from the test sample for the performance of the test or for analysis. Note 2 to entry: The laboratory sample is the final sample from the point of view of sample collection, but it is the initial sample from the point of view of the laboratory. Note 3 to entry: Several laboratory samples may be prepared and sent to different laboratories or to the same laboratory for different purposes. When sent to the same laboratory, the set is generally considered as a single laboratory sample and is documented as a single sample.
3.11 nominal top size smallest aperture size of the sieve used for determining the particle size distribution of solid recovered fuels through which at least 95 % by mass of the total material passes through the sieve [SOURCE: ISO 21637:2020, 3.48] 3.12 percentage modern Carbon pmC carbon mass fraction from biogenic origin Note 1 to entry: The internationally accepted radiocarbon dating reference value is 95 percent of the activity, in AD 1950, of this NBS oxalic acid SRM4990B. Note 2 to entry: In 2015, the value of 100 % biogenic carbon was set at 102 pmC. Note 3 to entry: The biogenic origin is expressed in percentage. 3.13 sample quantity of material, from a larger amount for which the quality is to be determined [SOURCE: ISO 21637:2020, 3.63, modified — Notes 1–3 to entry have been removed.] 3.14 sample preparation actions taken to obtain representative laboratory samples (3.7) or test portions from the original sample (3.13) as received [SOURCE: ISO 21637:2020, 3.66]