ISO 787-19-1974 颜料的通用试验方法 第19部分:水溶性硝酸盐的测定(水杨酸法)

标准号：ISO 787-19-1974
中文标准名称：颜料的通用试验方法 第19部分:水溶性硝酸盐的测定(水杨酸法)
英文标准名称：General methods of test for pigments; part 19: determination of water-soluble nitrates (Salicylic acid method)
标准类型：G53
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G53
国际标准分类号：87.060.10
适用范围：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.