塑料 用于生产聚氨酯的多元醇 水含量的测定

[中文适用范围]： 本文件规定了用于测量用作聚氨酯原料的多元醇中水含量的方法。方法 A 是一种手动安培法，该方法被纳入进来是为了更好地定义卡尔费休测量的原理。安培法适用于各种多元醇，包括那些颜色足以掩盖视觉终点的多元醇。方法 B 包括自动安培法程序和自动库仑法程序。库仑法程序是一种绝对方法，不需要校准，与安培法相比，灵敏度更高。 [外文原描述]： This document specifies methods used to measure the water content of polyols employed as polyurethane raw materials. Method A is a manual amperometric method which has been included to better define the principles of the Karl Fischer measurement. Amperometric methods are applicable to a wide range of polyols, including those which have enough colour to obscure a visual end-point. Method B includes an automated amperometric procedure and an automated coulometric procedure. The coulometric procedure is an absolute method that does not require calibration and gives improved sensitivity compared with amperometric methods.