An increase in the concentration of pollutants by the process of food chains is called

 The enrichment of an environment with chemical nutrients, often compounds containing nitrogen, phosphorus, or both are referred to as eutrophication. Defluoridation refers to water treatment procedures that lower fluoride concentrations in the water. Biological oxidation is the oxidation that takes place in biological systems. However, bio-amplification refers to the rise in pollutant concentration caused by the food chain process.