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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; Corrigendum 1 Corrigenda by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2019
