1.1 本试验方法包括测量粘土对亚甲基蓝染料的吸附，该吸附作为粘土的亚甲基蓝指数计算。 1.2 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。 1.3 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。 1.4 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====== 3.1 在许多粘土上进行的试验通常表明，亚甲基蓝指数（MBI）与阳离子交换容量、干粘结强度和浇注率等基本粘土特性之间存在直线关系。当粘土的胶体部分为高岭石时，也与比表面直接相关（由氮吸附确定）。如果胶体部分含有大量伊利石或蒙脱石，则不存在相同的密切相关性。与比表面相比，MBI与陶瓷成型性能的相关性更好。 3.2 位于胶体范围内的粘土部分（通常定义为0.5-0.001-μm范围）决定了粘土的严格胶体性质，以及与粘土和粘土相关的有机材料的数量和类型- 0.2μm分数，在很大程度上决定了粘土在陶瓷成型过程中的性能。虽然粘土的比表面是粒径和形态的函数，并且染料吸附和比表面之间存在关系，但MBI不应被视为粒径分析，因为获得的值仅由粒径分布非常细的一端的特征决定。本程序描述了粘土染料吸附（在本例中为亚甲基蓝）的测定。

1.1 This test method covers the measurement of the adsorption of methylene blue dye by a clay, which is calculated as a methylene blue index for a clay. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 ====== 3.1 Tests run on many clays generally indicate that a straight-line relationship exists between the methylene blue index (MBI) and such fundamental clay properties as cation exchange capacity, dry bond strength, and casting rate. Where the colloidal portion of the clay is kaolinite, there is also a direct correlation with specific surface (as determined by nitrogen adsorption). Where the colloidal portion contains significant amounts of illite or montmorillonite, the same close correlation does not exist. The MBI better correlates with the ceramic-forming properties than does the specific surface. 3.2 That portion of a clay lying within the colloidal range (generally defined as the 0.5- to 0.001-μm range), determines the strictly colloidal properties of the clay and, together with the amount and type of organic material associated with the clay and the 2- to 0.2-μm fraction, largely determines the properties of the clay when used in ceramic-forming processes. While the specific surface of a clay is a function of the particle size and morphology and a relationship exists between dye adsorption and specific surface, the MBI should not be considered to be a particle size analysis since the value obtained is dominated by the character of only the very fine end of the particle size distribution. This procedure describes the determination of the dye adsorption (in this case, methylene blue) of a clay.