前言这是CSA W213的第一版，木质素-通过31P NMR对羟基进行定量。CSA集团承认，作为创新计划的一部分，加拿大标准委员会的财政支持部分促成了本标准的制定。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。范围1。1概述本标准描述了木质素中存在的脂肪族（R-OH）、羧酸（R-COOH）和酚羟基（Ph-OH）的定量方法。酚羟基包括a）丁香基（S）、愈创木酰（G）和对羟基苯基（H）单元；b）含有-5,4-O-5'和5-5'单元间连接的缩合酚类化合物。1.2方法学该程序利用磷衍生化- 包含试剂，然后进行31P NMR分析。1.3应用本程序适用于干燥固体木质素（例如，粉末状），从制浆过程中以酸性形式分离，完全溶于NMR溶剂混合物。如果木质素未完全溶解在NMR溶剂中，则获得的数据将仅代表木质素样品可溶部分的结构。1.4例外情况本程序不适用于原浆黑液、湿木质素或高灰分或碳水化合物含量的木质素，只要这些影响木质素在所选溶剂系统中的溶解度。1.5本标准中的术语“应”用于表示要求，即用户为遵守本标准而有义务满足的规定；“应该”用于表示建议或建议但不需要的建议；“可”用于表示一个选项或在标准范围内允许的选项。 注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。

PrefaceThis is the first edition of CSA W213, Lignin - Quantification of hydroxyl groups by 31P NMR. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of the Standards Council of Canada, as part of the Innovation Initiative. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.Scope1.1 General This Standard describes a method for the quantification of the aliphatic (R-OH), carboxylic acid (R-COOH), and phenolic (Ph-OH) hydroxyl groups present in lignin. Phenolic hydroxyl groups include a) syringyl (S), guaiacyl (G), and p-hydroxyphenyl (H) units; and b) condensed phenolics incorporating -5, 4-O-5', and 5-5' inter-unit linkages.1.2 Methodology The procedure utilizes derivatization with a phosphorus-containing reagent followed by 31P NMR analysis.1.3 Application The procedure is applicable to dry solid lignins (e.g., in powdered form), isolated from the pulping processes in their acid form, that are completely soluble in the NMR solvent mixture. If the lignin is not fully dissolved in the NMR solvent, the data obtained will represent only the structure of the soluble portion of the lignin sample.1.4 Exclusions The procedure does not apply to raw black liquor, wet lignin, or lignin with a high ash or carbohydrate content, to the extent that these affect lignin solubility in the selected solvent system.1.5 Terminology In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.