1.1 本指南涉及使用光子相关（PCS）技术测量悬浮颗粒的粒径分布，悬浮颗粒仅为或主要为100 nm以下。它没有提供任何特定纳米材料的完整测量方法，但提供了良好实践应遵循的方法的一般概述和指南，以及潜在的陷阱。 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====== 5.1 PCS是极少数能够测量纳米尺寸区域内粒度分布的技术之一。本指南重点介绍了这种光散射技术，通常适用于从亚纳米区域到样品中开始沉淀的粒径范围。PCS技术通常应用于液体载体中固体材料的泥浆或悬浮液。这是一种第一原理方法（即校准在标准理解这个词时，不涉及）。测量基于流体动力学，因此提供悬浮介质（通常为水）中的尺寸信息。因此，流体动力直径几乎肯定会与其他技术隔离的其他尺寸直径不同，PCS技术的用户在进行技术比较之前需要了解不同粒径描述符的区别。尽管有上述规定，该技术在工业界和学术界广泛应用，作为研究和开发工具以及亚微米系统表征的质量控制方法。

1.1 This guide deals with the measurement of particle size distribution of suspended particles, which are solely or predominantly sub-100 nm, using the photon correlation (PCS) technique. It does not provide a complete measurement methodology for any specific nanomaterial, but provides a general overview and guide as to the methodology that should be followed for good practice, along with potential pitfalls. 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 ====== 5.1 PCS is one of the very few techniques that are able to deal with the measurement of particle size distribution in the nano-size region. This guide highlights this light scattering technique, generally applicable in the particle size range from the sub-nm region until the onset of sedimentation in the sample. The PCS technique is usually applied to slurries or suspensions of solid material in a liquid carrier. It is a first principles method (that is, calibration in the standard understanding of this word, is not involved). The measurement is hydrodynamically based and therefore provides size information in the suspending medium (typically water). Thus the hydrodynamic diameter will almost certainly differ from other size diameters isolated by other techniques and users of the PCS technique need to be aware of the distinction of the various descriptors of particle diameter before making comparisons between techniques. Notwithstanding the preceding sentence, the technique is widely applied in industry and academia as both a research and development tool and as a QC method for the characterization of submicron systems.