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  QUALITY NATURAL WATERS. QUALITY ASSESSMENT OF NATURAL WATERS.
 Taken to divide water quality in the physical, chemical, and sanitary-bacteriological. The physical parameters include temperature of the water content in it of suspended solids, color, smells and flavors.
The chemical composition of water is usually characterized by the following parameters: ionic composition, hardness, alkalinity, oxidation, the active concentration of hydrogen ions (pH), dried and calcined residue, TDS (the amount of cations and anions), dissolved oxygen, free carbon dioxide, hydrogen sulfide, chlorine (chlorination of water).
Due to possible contamination of water sources of industrial and domestic wastewater may need to define a number of specific hazardous substances that are generally not contained in natural waters (eg, copper, lead, zinc, mercury, arsenic, phenols, petroleum, oils and radioactive substances).
To obtain reliable information on the composition of the water it is important to take samples, their storage and transportation. From open ponds of water samples should be collected in that place, and with the depth at which it is supposed to arrange construction of rainwater. Samples must be collected in spring floods, summer low water level, during the autumn rains and in the middle of winter - each season for at least three samples.
Gravity of groundwater sources (wells, dug wells) should be selected at least nine samples - three tests in the spring, summer and winter. Pressure from artesian wells receiving water from a well-protected from contamination of the aquifer, it is enough to make an analysis of two samples taken at any time of year, one after the other not less than 24 hours
If you need to determine the quality of underground water in the absence of well prepared for evacuation, for an estimated assessment is to take samples of water from nearby wells, which feed from the same aquifer, which is supposed to base underground water intake.
Each sample sent to a lab for analysis, accompanied by detailed guidance on the location of sampling, water temperature at the source, date and hour of sampling, the appearance of the water during the selection process (turbidity, color) and odor. In addition, you must specify the weather conditions during sampling and in the previous 10 days (air temperature, precipitation).
The content of carbon dioxide in the water, and ferrous ferric iron, as well as the pH is desirable to determine the on-site water sources, immediately after sampling. If the selection of samples detected the smell of hydrogen sulfide, its concentration is better to define and record a sample on-site water source.
The remaining definitions can be made after delivery of samples to the laboratory, preferably on the day of sampling. If this is not possible, samples should be stored in the refrigerator, but no more than 72 hours for non-contaminated and not more than 48 hours for contaminated water.
The order and location of water sampling in monitoring the work of the structures and devices are provided water treatment plants operating instructions.