1.1 本试验方法包括测定大多数水和废水中的溶解钡和总可回收钡。 1.2 本试验方法在33.5至132μg/L的钡范围内进行评估。通过改变进样量或仪器设置，可以增加或减少范围。高浓度可稀释，但最好通过直接吸入原子吸收分光光度法进行分析。 1.3 该试验方法已成功用于废水处理厂废水、湖水、过滤自来水和井水。分析员有责任确定试验方法对其他基质的适用性。 1.4 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。 1.5 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。 1.6 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 钡在自然界的丰度排序中约为第六位；然而，它通常只在饮用水中发现微量。 摄入、吸入或吸收500至600毫克被认为对人类是致命的。低水平可能导致心脏、血管和神经的紊乱。饮用水标准将钡的最大污染水平设定为2毫克/升。 3.

1.1 This test method covers the determination of dissolved and total recoverable barium in most waters and wastewaters. 1.2 This test method was evaluated in the range from 33.5 to 132 μg/L of barium. The range can be increased or decreased by varying the volume of sample injected or the instrumental settings. High concentrations may be diluted but preferably should be analyzed by direct aspiration atomic absorption spectrophotometry. 1.3 This test method has been used successfully with waste treatment plant effluent water, lake water, filtered tap water, and well water. It is the responsibility of the analyst to determine the suitability of the test method for other matrices. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 Barium ranks about sixth in order of abundance in nature; however, it is normally found in only trace quantities in drinking water. Consumption, inhalation, or absorption of 500 to 600 mg is considered fatal to human beings. Lower levels may result in disorders of the heart, blood vessels, and nerves. The drinking water standards set the maximum contaminant level for barium as 2 mg/L. 3