The most frequent specific indicators of water quality include:
The content of phenols in the water, along with the arrival of antropogen sources can be determined aquatic metabolism and biochemical transformation of organic substances. The source of phenols proceeds are humic substances from soils and peatlands. Phenols are toxic to aquatic life and affect the organoleptic properties of water.
By mineral oil include fuel oils, bitumens and some other products, representing a mixture of hydrocarbons of various classes. The sources of petroleum are leaks in their production, processing and transport, as well as waste water. A small amount of oil can be released as a result of intra-vodoemnyh processes. Included in the petroleum hydrocarbons are toxic and, to some extent, a narcotic effect on living organisms, affecting the cardiovascular and nervous systems.
By surfactant substances (surfactants) include organic substances which have a pronounced ability to adsorb at the interface "air-liquid". In the vast majority of the water falling surfactants are synthetic (surfactants). Detergents are toxic to aquatic organisms and humans, impair gas exchange with the atmosphere of a water body, reduce the intensity of vnutrivodoemnyh processes degrade the organoleptic properties of water. Detergents are slowly degradable substances.
Under pesticides understand a large group of synthetic organochlorine and organophosphorus substances used to control weeds, insects and rodents. The main source of income is the surface and drainage water from agricultural lands. Pesticides have toxic, mutagenic and cumulative action, is slowly destroyed.
The most common heavy metals include lead, copper and zinc. Heavy metals mutagenic and toxic effect, greatly reduce the intensity of biochemical processes in water bodies.