標準號：ISO 787-19-1974
中文標準名稱：顏料的通用試驗方法 第19部分:水溶性硝酸鹽的測定(水楊酸法)
英文標準名稱：General methods of test for pigments; part 19: determination of water-soluble nitrates (Salicylic acid method)
標準類型：G53
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：G53
國際標準分類號：87.060.10
適用范圍：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.