1.1本指南定义了二氧化碳纯度标准，以确保液化二氧化碳气体适用于SFE和SFC应用（术语定义见指南E1449）。本指南定义了成功的SFE或SFC实验室工作所需的二氧化碳杂质的定量、标记和统计标准，并建议了量化这些杂质的分析方法。 1.2本指南供专门为SFE或SFC应用制造二氧化碳的专业气体供应商使用。SFE或SFC公司 2. 声称遵守本指南的产品将满足与当前SFE或SFC技术需求相匹配的某些绝对纯度和污染物检测能力要求。使用本指南允许不同的SFE或SFC CO 2. 在同等纯度的基础上比较产品供应。 1.3本指南将污染物视为导致检测器信号干扰目标分析物信号或物理阻碍SFE或SFC实验的成分。 1.4以国际单位制表示的数值应视为标准。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This guide defines purity standards for carbon dioxide to ensure the suitability of liquefied carbon dioxide gas for use in SFE and SFC applications (see Guide E1449 for definitions of terms). This guide defines quantitation, labeling, and statistical standards for impurities in carbon dioxide that are necessary for successful SFE or SFC laboratory work, and it suggests methods of analysis for quantifying these impurities. 1.2 This guide is provided for use by specialty gas suppliers who manufacture carbon dioxide specifically for SFE or SFC applications. SFE or SFC CO 2 products offered with a claim of adherence to this guide will meet certain absolute purity and contaminant detectability requirements matched to the needs of current SFE or SFC techniques. The use of this guide allows different SFE or SFC CO 2 product offerings to be compared on an equal purity basis. 1.3 This guide considers contaminants to be those components that either cause detector signals that interfere with those of the target analytes or physically impede the SFE or SFC experiment. 1.4 The values stated in SI units are to be regarded as the standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.