本文件规定了使用元素分析仪直接测定生物基产品中总氧含量的方法。范围仅限于含有碳、氢、氧、氮、氯化物、溴化物和碘化物元素的产品，不含氟化物，至少占待分析产品成分的95%。注1:生物基材料可包含有机和无机成分。氧含量可能来源于有机和\/或无机成分。无机组分不是生物基的，但仍将有助于通过以下规定方法测定氧的量，因此影响氧含量方面的结果。根据目前的技术现状，通过同位素测量不可能在源自生物质的氧和源自非生物质的氧之间建立区别。注2虽然本文件的起草目的是测定生物基含量，但也可作为测定有机化合物中氧含量的独立标准。注3:在本文件中，单位“%（m\/m）”用于表示材料的含氧量。注4:本文件中规定的方法包括测定氧含量的直接测量方法。该方法与ASTM D5622[1]汽油和甲醇燃料标准有许多相似之处。本文件中规定的方法是专门为生物基产品开发和验证的。此外，与测定氧气的间接测量方法（如ASTM D 3176[2]）相比，该方法提供了更准确和无杂质的氧气测量值。

This document specifies a direct method for the determination of the total oxygen content in bio-based products using an elemental analyser. The scope is limited to products containing elements carbon, hydrogen, oxygen, nitrogen, chloride, bromide and iodide without fluoride, representing at least 95 % of the composition of the product to be analysed. NOTE 1 Bio-based materials can contain both organic and inorganic components. The oxygen content might originate both from the organic and/or the inorganic components. The inorganic components are not bio-based but will nevertheless contribute to the amount of oxygen determined by the following prescribed methods and therefore influence the results in terms of oxygen content. According to the current state of the art, it is not possible by isotopic measurements to establish a distinction between oxygen originating from biomass and oxygen originating from non-biomass. NOTE 2 Although this document has been drafted for the purpose of the determinations dealing with bio-based content, it can be also used as a standalone standard for determination of oxygen in organic compounds. NOTE 3 For the purposes of this document, the unit "% (m/m)" is used to represent the oxygen content of a material. NOTE 4 The method specified in this document involves a direct measurement method for the determination of oxygen content. This method contains many similarities with the ASTM D5622 [1] standard for gasoline and methanol fuels. The method specified in this document is specifically developed and validated for bio-based products. In addition, this method provides more accurate and unadulterated measured values for oxygen in contrast to indirect measurement methods for the determination of oxygen (e.g. ASTM D 3176 [2]).