DIN EN ISO 9509:2006-10 Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms (ISO 9509:2006); German version EN ISO 9509:2006
2006DIN EN ISO 9509:2006-10 Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms (ISO 9509:2006); German version EN ISO 9509:2006
2006DIN EN ISO 9509:2006 Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms (ISO 9509:2006); English version of DIN EN ISO 9509:2006-10