1.1 本试验方法涵盖了氧化亚氮-乙炔火焰中铝的直接火焰原子吸收测定。 1.2 本试验方法适用于溶解铝和总可回收铝含量在0.5至5.0 mg/L范围内的水。可使用本试验方法在不稀释的情况下测定高达约50 mg/L的铝浓度。然而，对于大于5.0 mg/L的浓度，没有可用的精度和偏差数据。 1.3 该试验方法在试剂水、天然水和饮用水上进行了试验。用户有责任确保本试验方法对未经试验基质的水的有效性。 1. 4. 相同的消解程序可用于测定总可回收镍（试验方法 D1886 )、铬（试验方法 D1687 )、钴（试验方法 D3558 )，铜（试验方法 D1688 )、铁（试验方法 D1068号 )，铅（试验方法 D3559 )，锰（试验方法 D858 )和锌（试验方法 D1691 ). 1.5 获得了试剂水、天然水和饮用水的精度和偏差数据。用户有责任确保该测试方法在未测试矩阵上的有效性。 1.6 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.7 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。 有关具体的危险说明，请参阅 7.5 , 8.4 和 注释2 . 1.8 停止使用以前的试验方法A（荧光法）和B及C（分光光度法）。提到 附录X1 以获取历史信息。 1.9 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 虽然关于铝在人体内的毒理学意义的可用信息很少，但美国水务协会已制定了最高0.05 mg/L的水质指南或目标。根据国家污染排放消除系统（NPDES），一些许可证可能会设定铝排放限值。确实存在一些证据表明，低浓度（5 mg/L）会干扰活性污泥过程。出于上述原因，可能需要监测铝。 5.2 在使用明矾的锅炉补给水中监测铝，以确定预处理后是否存在铝。 残余铝可能消耗离子交换容量，或消耗添加到锅炉给水中化学计量螯合硬度离子（即钙和镁）中的锅炉水处理化学品。 5.3 由于铝的存在可能导致阻垢剂或缓蚀剂处理化学品或两者中的阴离子物质失活，因此在冷却水补给中对铝进行监测。失活可能导致抑制剂性能下降。 5.4 ICP-MS也适用，但仪器成本较高。见测试方法 D5673 .

1.1 This test method covers the direct flame atomic absorption determination of aluminum in the nitrous oxide-acetylene flame. 1.2 This test method is applicable to waters containing dissolved and total recoverable aluminum in the range from 0.5 to 5.0 mg/L. Aluminum concentrations as high as approximately 50 mg/L can be determined using this test method without dilution. However, no precision and bias data are available for concentrations greater than 5.0 mg/L. 1.3 This test method was tested on reagent, natural, and potable waters. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices. 1.4 The same digestion procedure may be used to determine total recoverable nickel (Test Methods D1886 ), chromium (Test Methods D1687 ), cobalt (Test Methods D3558 ), copper (Test Methods D1688 ), iron (Test Methods D1068 ), lead (Test Methods D3559 ), manganese (Test Methods D858 ), and zinc (Test Methods D1691 ). 1.5 Precision and bias data have been obtained on reagent, natural, and potable waters. It is the responsibility of the user to ensure the validity of this test method on untested matrices. 1.6 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversion to inch-pound units that are provided for information only and are not considered standard. 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 7.5 , 8.4 , and Note 2 . 1.8 Former Test Methods A (Fluorometric) and B and C (Spectrophotometric) were discontinued. Refer to Appendix X1 for historical information. 1.9 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 Although there is little information available concerning the toxicological significance of aluminum in man, the American Water Works Association has established a water quality guideline or goal of a maximum of 0.05 mg/L. Under the National Pollution Discharge Elimination System (NPDES), some permits may set aluminum discharge limits. Some evidence does exist to indicate that low levels (5 mg/L) will interfere with activated sludge processes. For the above reasons monitoring of aluminum may be desirable. 5.2 Aluminum is monitored in boiler make-up water, where alum has been used, to determine whether aluminum is present after pretreatment. Residual aluminum may consume ion exchange capacity or consume boiler water treatment chemicals added to stoichiometrically chelate hardness ions (that is, calcium and magnesium) in boiler feed water. 5.3 Aluminum is monitored in cooling water make-up, since its presence may result in deactivation of anionic substances in scale or corrosion inhibitor treatment chemicals, or both. Deactivation may result in decreased performance of inhibitors. 5.4 ICP-MS may also be appropriate but at a higher instrument cost. See Test Method D5673 .