离心液体沉降法测定粒度分布 第1部分：一般原则、要求和指导

[中文适用范围]： 本文件规定了离心液体沉降法 (CLS) 的粒度分析原理。它还： — 定义相关术语； — 描述各种测量技术； — 为样品制备、测量和数据分析提供指导； — 制定方法验证、确定不确定度预算以及结果表示的规则。本文件的一个重要部分涉及从 CLS 数据推导粒度分布，包括以下讨论： — 布朗运动的影响； — 粒子浓度的并行确定； — 尺寸和浓度的工作范围； — 非球形和多孔粒子的处理。本文件适用于由低粒子浓度分散体组成的样品，因此可以将粒子的运动视为完全孤立粒子的运动。本文件不涉及重力、电力或磁力引起的粒子迁移。它也不涉及除尺寸、沉降速度和沉降系数之外的粒子特性的推导。注意本文件可能涉及危险材料、操作和设备。它并不旨在解决与其使用相关的所有安全问题。检查低闪点挥发性液体时，可能适用有关防爆分析仪的规定。本文件的使用者有责任在使用前制定适当的安全和健康措施，并确定监管限制的适用性。 [外文原描述]： This document specifies the principles of particle size analysis by centrifugal liquid sedimentation (CLS). It also: — defines the relevant terms; — describes the various measurement techniques; — gives guidance for sample preparation, conducting measurements as well as data analysis; — establishes rules for method validation, determination of the uncertainty budget as well as representation of results. An important part of this document deals with the derivation of particle size distributions from CLS data, including discussions on: — the impact of Brownian motion; — the parallel determination of particle concentrations; — the working range with respect to size and concentration; —the handling of non-spherical and porous particles. This document applies to samples composed of dispersions of low particle concentration, so that the particles’ motion can be considered as that of fully isolated particles. This document does not cover particle migration by gravity, electric or magnetic forces. It also does not cover deriving particle properties other than size, sedimentation velocity and sedimentation coefficient. NOTE This document can involve hazardous materials, operations and equipment. It does not purport to address all the safety problems associated with its use. Regulations regarding explosion-proof analysers can apply when examining volatile liquids with a low flash point. It is the responsibility of the user of this document to establish appropriate safety and health practices and to determine the applicability of the regulatory limitations prior to its use.