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Paint and Coatings Industry Standards
ISO 787-19:1974 ISO 787-19:1974 General methods of test for pigments -- Part 19: Determination of water-soluble nitrates (Salicylic acid method)
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.
