turbidity of water

The turbidity of natural waters is caused by the presence of fine impurities caused by insoluble or colloidal inorganic and organic substances of various origins. Qualitative definition is conducted descriptively: weak opalescence, opalescence, weak, noticeable and strong turbidity. In accordance with the hygienic requirements for the quality of drinking water, the turbidity should not exceed 1.5 mg / dm3. Turbidity of water is determined by turbidimetric method (by attenuation of light passing through the sample).

Turbidimetric determination is intended for waters having a changeable composition and the shape of fine impurities. Without preliminary filtering of the sample with a turbidimetric method, not only colloidal but also coarser particles