BS EN ISO 9509:1995

Заменен

Water quality. Method for assessing the inhibition of nitrification of activated sludge micro-organisms by chemicals and waste water — 12 стр.

Заменен на

BS EN ISO 9509:2006

ICS

13.060.30 Sewage. Including sewage water disposal and treatment / Сточные воды. Включая удаление и очистку сточных вод

13.060.70 Examination of biological properties of water / Исследование биологических свойств воды