This part of EN ISO 787 specifies a general method of test for determining the water-soluble nitrates in a sample of pigment by a spectrophotometric method using salicylic acid.
DS/EN ISO 787-19:1995 history
1995DS/EN ISO 787-19:1995 General methods of test for pigments - Part 19: Determination of water-soluble nitrates (Salicylic acid method)