Lawn chemicals, when used as directed, don't break down completely but filter into lakes, rivers and aquifers, affecting drinking water supplies. It is used to control many broadleaf weeds such as dandelions. Dissolved oxygen in streams by Sandra Eidson , Martha Nix , Jane Mullinax , Debra Wood . Most living things including aquatic organisms use oxygen in respiration. The amount of oxygen dissolving in water is influenced by water temperature.
Many factors contribute to the dissolved oxygen level.
The Duckweed Coalition by Daniel Hyke , Arronza Major , Helen Simmons , Debora Stone , Melissa Weimer . Duckweed, a monocot aquatic species of plants, is a natural purifier of water. Duckweed is capable of treating wastewater, namely nitrates and phosphates, by absorbing the compounds and converting it to biomass and water. It will only survive under certain conditions and is not found in all areas. Presently, duckweed is being used in some areas as a biological means of wastewater treatment and as biomass to feed livestock.