1.1 本规程涵盖适用于通过直接水注射气相色谱法定性和定量测定水中特定有机化合物或各类化合物的某些试验方法的一般指南 ( 1. , 2. , 3. , 4. ) . 2. 1.2 水溶液浓度大于约1mg/L的挥发性有机化合物通常可以通过直接水注射气相色谱法测定。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 这种做法有助于识别废水中的主要有机成分，以支持有效的厂内或污染控制计划。目前，初步鉴定和测量一系列挥发性有机化合物的最实用的方法是气液色谱法。阳性鉴定需要补充测试（例如，多列、专用检测器、光谱学或这些技术的组合）。

1.1 This practice covers general guidance applicable to certain test methods for the qualitative and quantitative determination of specific organic compounds, or classes of compounds, in water by direct aqueous injection gas chromatography ( 1 , 2 , 3 , 4 ) . 2 1.2 Volatile organic compounds at aqueous concentrations greater than about 1 mg/L can generally be determined by direct aqueous injection gas chromatography. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This practice is useful in identifying the major organic constituents in wastewater for support of effective in-plant or pollution control programs. Currently, the most practical means for tentatively identifying and measuring a range of volatile organic compounds is gas-liquid chromatography. Positive identification requires supplemental testing (for example, multiple columns, speciality detectors, spectroscopy, or a combination of these techniques).