1.1 该试验方法包括测定饮用水、废水和地下水中的溶解气体甲烷、乙烷、乙烯和丙烷，包括自然产生的或商业活动产生的生活井，或两者兼有。该测试方法的甲烷分析范围为10µg/L至11000µg/L，甲烷分析范围从10µg/L到5000 µg/L，用于乙烷、乙烯和丙烷。如果样品的溶解气体浓度高于校准范围，则需要对样品进行稀释。可以使用其他分析范围，只要仪器校准包括所需范围并证明足够的线性即可。 1.2 本试验方法适用于在标称环境压力下采集的样品。在高压（即高于环境压力）下采集的样品可能无法使用该方法进行准确分析。 1.3 本试验方法适用于各种溶解气体； 然而，对于本标准，仅对甲烷、乙烷、乙烯和丙烷进行了验证。为了验证该方法中未列出的气体，分析员需要确定新气体的饱和浓度，并根据该方法中概述的程序建立有效曲线、方法检测限值和能力证明。 1.4 分析员有责任确保本试验方法对溶解气体（甲烷、乙烷、乙烯、丙烷和其他样品基质除外）的有效性。 1.5 单位-- 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 为了确定替代品的精度和偏差，进行了一项单独的实验室研究（见第节 16 ). 1.7 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。 1.8 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 本试验方法包括测定饮用水、废水和地下水（包括生活水井）中的溶解气体甲烷、乙烷、乙烯和丙烷；无论是自然产生的还是商业活动产生的，溶解气体都可能对环境和人类造成危害。由于对溶解气体的审查力度越来越大，开发一种有效的水中溶解气体测试方法变得更加迫切。 静态顶空取样通常适用于这些化合物的取样。然而，由于这些化合物极易挥发，建议采用封闭式取样系统。该试验方法可用于定量测定地下水、废水和饮用水中的溶解气体。 5.2 该测试方法适用于在石油和天然气勘探活动之前分析住宅和商业供水井的生活饮用水样本，以形成监测勘探期间潜在影响的基线；开发，包括水力压裂；活动关闭；以及回收附近的石油和天然气生产井和注入井。

1.1 This test method covers the determination of the dissolved gases methane, ethane, ethylene, and propane in drinking, waste, and ground waters, including domestic wells whether naturally occurring or resulting from commercial activities, or both. This test method has an analytical range from 10 µg/L to 11 000 µg/L for methane, and 10 µg/L to 5000 µg/L for ethane, ethylene, and propane. If a sample has a dissolved gas concentration above the calibration range, the sample would require dilution. Other analytical ranges may be used as long as the instrument calibration encompasses the desired range and demonstrates adequate linearity. 1.2 This test method is applicable to samples collected at a nominal ambient pressure. Samples collected under high pressures, that is, above ambient pressure, may not be accurately analyzed using this method. 1.3 This test method is applicable to a variety of dissolved gases; however, for the present standard, only methane, ethane, ethylene, and propane were validated. In order to validate for a gas not listed in this method, the analyst would need to establish the saturation concentration of the new gas, and establish a valid curve, method detection limits, and demonstration of capability following the procedures outlined in this method. 1.4 It is the analyst’s responsibility to ensure the validity of this test method for dissolved gases other than methane, ethane, ethylene, and propane and other sample matrices. 1.5 Units— The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.6 A single laboratory study was done in order to establish precision and bias for the surrogate (see Section 16 ). 1.7 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. 1.8 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 test method covers the determination of the dissolved gases methane, ethane, ethylene, and propane in drinking, waste, and ground waters, including domestic wells; whether naturally occurring or resulting from commercial activities, dissolved gases can be hazardous both to the environment and humans. Due to increased scrutiny of dissolved gases, developing a valid method for the testing of dissolved gases in water has become more imperative. Static headspace sampling is generally applicable for sampling these compounds. However, as these compounds are extremely volatile, a closed sampling system is recommended. This test method can be used for quantitatively determining dissolved gases in ground, waste, and drinking waters. 5.2 This test method is suitable for analysis of domestic drinking water samples from residential and commercial water supply wells prior to oil and gas exploration activities to form a baseline for monitoring potential impacts during exploration; development, including hydraulic fracturing; operation; closure; and reclamation of nearby oil and gas production and injection wells.