1.1 本试验方法包括测定饮用水、地下水、地表水、废水中的总碳（TC）、无机碳（IC）、总有机碳（TOC）、溶解有机碳（DOC）和非净化有机碳（NPOC），以及0.5 mg/L至50 mg/L范围内的海水。50–4000 mg/L的碳浓度可通过自动注入较少的样品体积或通过样品稀释来确定。或者，使用更少的样品体积，并在更高浓度下校准。 1.2 将样品注入加热温度为 ≥ 680ºC。样品转化为气相，并强制通过一层催化剂，确保所有含碳化合物转化为CO 2. . 非色散红外（NDIR）探测器测量产生的CO 2. . 1.3 对于TOC和DOC分析，注入一部分样品以测定TC或溶解碳（DC）。然后对部分样品进行酸化和净化，以去除IC。 净化后的无机碳测量为TIC或DIC。TOC或DOC的计算方法是从总碳中减去无机部分: 1.4 对于NPOC分析，对部分样品进行酸化和净化，以去除IC。然后注入净化的样品以测定NPOC。 1.5 本试验方法适用于实验室间研究中验证的基质和浓度。用户有责任确保本试验方法对未经试验基质和不同浓度范围的水的有效性。 1.6 本试验方法仅适用于样品中可引入反应区的含碳物质。注射器针头或注射器开口尺寸通常会限制由此引入的颗粒的最大尺寸。 1.7 除实验室分析外，该试验方法还可用于河流监测。 1.8 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。 1.9 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。 1.10 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====== 5.1 本试验方法用于测定来自各种自然、家庭和工业来源的水的碳含量。在其最常见的形式中，该试验方法用于测量有机碳，作为监测工业废水中有机污染物的一种手段。 这些测量也用于监测废物处理过程。 5.2 文献中描述了TOC与其他水质参数的关系，如化学需氧量（COD）和总需氧量（TOD）。 4.

1.1 This test method covers the determination of total carbon (TC), inorganic carbon (IC), total organic carbon (TOC), dissolved organic carbon (DOC), and non-purgable organic carbon (NPOC) in drinking water, groundwater, surface water, wastewater, and seawater in the range from 0.5 mg/L to 50 mg/L. Concentrations of 50–4000 mg/L of carbon may be determined by automated injection of less sample volume or by sample dilution. Alternatively, use less sample volume and calibrate at higher concentrations. 1.2 The sample is injected into a tube heated at ≥ 680ºC. The sample converts into a gaseous phase and forced through a layer of catalyst ensuring conversion of all carbon containing compounds to CO 2 . A non-dispersive infrared (NDIR) detector measures the resulting CO 2 . 1.3 For TOC and DOC analysis a portion of the sample is injected to determine TC or dissolved carbon (DC). A portion of the sample is then acidified and purged to remove the IC. The purged inorganic carbon is measured as TIC, or DIC. TOC or DOC is calculated by subtracting the inorganic fraction from the total carbon: 1.4 For NPOC analysis a portion of sample is acidified and purged to remove IC. The purged sample is then injected to determine NPOC. 1.5 This test method is applicable to the matrices and concentrations validated in the inter-laboratory study. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices and different concentration ranges. 1.6 This test method is applicable only to carbonaceous matter in the sample that can be introduced into the reaction zone. The syringe needle or injector opening size generally limits the maximum size of particles that can be so introduced. 1.7 In addition to laboratory analyses, this test method may be applied to stream monitoring. 1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.9 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. 1.10 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 is used for determination of the carbon content of water from a variety of natural, domestic, and industrial sources. In its most common form, this test method is used to measure organic carbon as a means of monitoring organic pollutants in industrial wastewater. These measurements are also used in monitoring waste treatment processes. 5.2 The relationship of TOC to other water quality parameters such as chemical oxygen demand (COD) and total oxygen demand (TOD) is described in the literature. 4