what does the abbreviation noael mean for water quality
means the lowest tested concentration that caused an adverse effect in comparison with a control when all higher test concentra-tions caused the same effect. (23) âNo observable adverse effect levelâ or âNOAELâ means the highest tested concentration that did not cause an adverse effect in comparison with a control when no lower test concentration caused an adverse effect. (24) âOctanol/water partition coefficientâ or âKOWâ means