本文件规定了将组合样品减少为实验室样品以及将实验室样品减少为子样品和一般分析样品的方法。本文件中描述的方法可用于样品制备，例如，当测试样品的体积密度、生物量测定、耐久性、粒度分布、水分含量、灰分含量、灰分熔化行为、热值、化学成分和杂质时。这些方法不适用于测试桥接性能所需的非常大的样品。

This document specifies methods for sample preparation to ensure representativeness of the samples throughout the preparation procedures to produce general analysis samples. Suitable test portions can be taken from the laboratory or general analysis samples and used for analysis according to the specific requirements defined in the corresponding analytical procedures. This document specifies the correct sample preparation sequence to be applied to: a) the composite sample, in order to produce a laboratory sample (taking into account large pieces of solid recovered fuel); b) each sub-sampling step throughout the testing programme; c) the laboratory sample, in order to obtain suitable test portions; d) ensure the representativeness of the test portions that have been taken according to the sample preparation plan, prior to physical analysis, chemical analysis or both (e.g. extractions, digestion, analytical determinations). The methods specified in this document can be used for sample preparation, for example, when the samples are to be tested for bulk density, biomass content determination, mechanical durability, particle size distribution, moisture content, ash content, ash melting behaviour, calorific value, chemical composition, impurities and self-heating properties. The methods are not intended to be applied to the very large samples required for the testing of bridging properties.