1.1 这些试验方法包括测量以二氧化碳（CO）形式存在的总二氧化碳或溶解二氧化碳 2. )，水中的碳酸、重碳酸盐离子和碳酸盐离子: 范围 小节 试验方法A（气敏电极） 2至800毫克/升 8. 到 15 试验方法B（CO 2. 进化，库仑滴定） 5至800毫克/升 16 到 24 1.2 还可以从样品中颗粒物中的碳酸盐中检测到二氧化碳。 1.3 试验方法A适用于各种天然水和盐水。 1.4 试验方法B适用于天然水、盐水和中描述的各种工业用水 16.4 . 1.5 用户有责任确保这些测试方法在未经测试的基质水上的有效性。 1.6 1988年，本标准停止了几种试验方法。提到 附录X1 以获取历史信息。 1.7 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。 1.8 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。 ====意义和用途====== 4.1 二氧化碳是动植物的呼吸产物，也是有机物和某些矿物质的分解产物。大气中CO的平均体积分数约为0.04% 2. . 地表水的含量通常低于10毫克/升，但局部有机物或矿物异常分解点除外；然而，地下水，特别是深水，可能含有数百毫克/升。 4.2 当溶解在水中时，CO 2. 大大加剧了水处理系统的腐蚀。这在蒸汽冷凝系统中尤其麻烦。 CO损失 2. 来自水系统的水可能会扰乱碳酸盐平衡，并导致封闭表面的方解石结垢。热水器的结垢就是一个很好的例子。由于腐蚀和结垢趋势之间的微妙平衡，必须非常小心地控制CO 2. 以及水系中的相关物种。为此，在软化和蒸汽冷凝液胺中和的最后阶段对市政供水进行再碳化。

1.1 These test methods cover the measurement of total or dissolved carbon dioxide present as carbon dioxide (CO 2 ), carbonic acid, bicarbonate ion, and carbonate ion in water: Range Sections Test Method A (Gas Sensing Electrode) 2 to 800 mg/L 8 to 15 Test Method B (CO 2 Evolution, Coulometric Titration) 5 to 800 mg/L 16 to 24 1.2 Carbon dioxide may also be detected from carbonates present in particulates in samples. 1.3 Test Method A is applicable to various natural waters and brines. 1.4 Test Method B is applicable to natural waters, brines, and various industrial waters as delineated in 16.4 . 1.5 It is the user's responsibility to ensure the validity of these test methods on waters of untested matrices. 1.6 Several test methods were discontinued from this standard in 1988. Refer to Appendix X1 for historical information. 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 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. ====== Significance And Use ====== 4.1 Carbon dioxide is a respiration product of plants and animals and a decomposition product of organic matter and certain minerals. The atmosphere averages about 0.04 vol % of CO 2 . Surface waters generally contain less than 10 mg/L, except at local points of abnormal organic or mineral decomposition; however, underground water, particularly deep waters, may contain several hundred mg/L. 4.2 When dissolved in water, CO 2 contributes significantly to corrosion of water-handling systems. This is particularly troublesome in steam condensate systems. Loss of CO 2 from an aqueous system can disturb the carbonate equilibrium and result in calcite encrustation of confining surfaces. Scaling of water heaters is a good example. Because of the delicate balance between corrosion and encrustation tendencies, much care must be given to control of CO 2 and related species in water systems. Recarbonation of municipal supplies during final stages of softening and amine neutralization of steam condensate are applied for these purposes.