Reference number
ISO 787-19:1974
© ISO 2025
ISO 787-19:1974
General methods of test for pigments — Part 19: Determination of water-soluble nitrates (Salicylic acid method)
Edition 1
1974-05
Withdrawn
Withdrawn (Edition 1, 1974)

Abstract

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.

General information

  • Status
     : Withdrawn
    Publication date
     : 1974-05
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 1
    Number of pages
     : 2
  • Technical Committee :
    ISO/TC 256
    ICS :
    87.060.10 
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