英文题名:German standard methods for the examination of water, waste water and sludge - Anions (group D) - Part 29: Spectrometric determination of nitrate with sulfosalicylic acid (D 29); ISO 7890-3:1988, modified
This document describes a chemical method for the spectrometric determination of nitrate in water. After adding sulfosalicylic acid a yellow compound is produced which will give the nitrate concentration by spectrometric measurement.