Nitrifying organisms are sensitive to a wide range of organic and inorganic compounds and at concentrations well below those concentrations that affect aerobic heterotrophic organisms.

• 硝化细菌对于很多的有机化合物和无机化合物都较敏感。硝化细菌能耐受的这些化合物的浓度也远远低于需氧型异养生物能耐受的浓度。