ISO 2174:1990 表面活性剂.已知钙质硬度水的制备

标准编号：ISO 2174:1990

中文名称：表面活性剂.已知钙质硬度水的制备

英文名称：Surface active agents — Preparation of water with known calcium hardness

发布日期：1990-04

标准范围

储备溶液是通过在水中溶解适量的氯化钙来制备的。使用媒介黑11（C.I.14645）和甲基红的混合物作为指示剂，用（亚乙基二硝基）四乙酸二钠盐（EDTA）络合滴定法测定储备溶液中的钙含量。通过稀释适当体积的储备溶液制备所需硬度的稀释溶液。

A stock solution is prepared by dissolving an appropriate quantity of calcium chloride in water. The calcium content of this stock solution is determined by complexometric titration with the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA) using a mixture of Mordant Black 11 (C.I. 14645) and methyl red as indicator. Dilute solutions of the hardness required are prepared by dilution of appropriate volumes of the stock solution.

标准预览图