ISO 787-19:1974 颜料的一般试验方法.第19部分：水溶性硝酸盐的测定（水杨酸法）

标准编号：ISO 787-19:1974

中文名称：颜料的一般试验方法.第19部分：水溶性硝酸盐的测定（水杨酸法）

英文名称：General methods of test for pigments — Part 19: Determination of water-soluble nitrates (Salicylic acid method)

发布日期：1974-05

标准范围

本文件规定了分光光度法。该方法的原理在于，样品提取物中的硝酸盐用于在硫酸介质中硝酸化水杨酸。所形成的硝基化合物在碱性溶液中呈深黄色，颜色在410 nm波长下用分光光度法测量。ISO 787/13规定了使用纳氏试剂的方法。这两种方法不一定给出相同的结果；目前正在对这两种方法进行比较。

This document specifies a spectrophotometric method. The principle of the method consists in that the nitrate present in the extract of the sample is used to nitrate salicylic acid in sulphuric acid medium. The nitro-compound formed is of an intense yellow colour in alkaline solution and the colour is measured spectrophotometrically at a wavelength of 410 nm. ISO 787/13 specifies a method using Nessler's reagent. The two methods may not necessarily give the same result; work is being carried out to compare the two methods.

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