1.1 这些试验方法包括水中溶解氧的测定。三种试验方法如下: 范围，mg/L 小节 试验方法A-滴定程序-高水平 >1.0 8 – 15 试验方法B-仪器探针程序-电化学 0.05至20 16 – 25 测试方法C-仪器探针程序发光传感器 0.05至20 26 – 31 1.2 试验方法A和B的精度是使用试剂水的饱和样品进行的。用户有责任确保未经测试基质水的测试方法的有效性。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 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、健康和环境实践，并确定监管限制的适用性。 有关具体的预防说明，请参阅 7.1 和 附注17 . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 许多水生生物（包括鱼类）的生存和生长需要溶解氧。溶解氧浓度也可能与腐蚀性和光合活性有关。缺氧可能导致有机物厌氧腐烂，并在水中产生有毒和不良的美学物质。

1.1 These test methods cover the determination of dissolved oxygen in water. Three test methods are given as follows: Range, mg/L Sections Test Method A—Titrimetric Procedure–High Level >1.0 8 – 15 Test Method B—Instrumental Probe Procedure—Electrochemical 0.05 to 20 16 – 25 Test Method C—Instrumental Probe Procedure—Luminescence-Based Sensor 0.05 to 20 26 – 31 1.2 The precision of Test Methods A and B was carried out using a saturated sample of reagent water. It is the user's responsibility to ensure the validity of the test methods for waters of untested matrices. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. For a specific precautionary statements, see 7.1 and Note 17 . 1.5 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 ====== 4.1 Dissolved oxygen is required for the survival and growth of many aquatic organisms, including fish. The concentration of dissolved oxygen may also be associated with corrosivity and photosynthetic activity. The absence of oxygen may permit anaerobic decay of organic matter and the production of toxic and undesirable esthetic materials in the water.