pollutants

Definition: Physical, chemical or biological agent, in a hydro system, which causes, by its concentration in water, prejudicial disturbances to the good balance of the ecosystem and which reduces the possibilities of uses of water.

One distinguishes:

micro pollutants:

Mineral or organic active product likely to have a toxic action with negligible concentrations (order of the µg/l or less).

macro pollutants:

Natural molecules, that are in different concentrations from those usually observed in the environment. That involves an increase in the kinetic of biochemical. reactions.