NA 119
DIN Standards Committee Water Practice
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DIN 38405-9
DIN 38405-9
German standard methods for examination of water, waste water and sludge; anions (group D), determination of nitrate ion (D9)
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Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung; Anionen (Gruppe D); Bestimmung des Nitrat-Ions (D 9)