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ISO 787-19:2020
General methods of test for pigments - Part 19: Determination of water-soluble nitrates (Salicylic acid method)standard by International Organization for Standardization, 04/01/2020
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ISO 787-19:2020 specifies a general method of test for determining the water-soluble nitrates in a sample of pigments by a spectrophotometric method using salicylic acid.
ISO 787-13 specifies a method for determining the water-soluble nitrates in a sample of pigments using Nessler`s method.