The USEPA and Standard Methods recommend a particular wavelength in the visible range of the spectrum and the European system requiring an infrared light source (ISO 7027). In order to satisfy these different requirements, HANNA has developed products that meet both standards.

What is turbidity?

Turbidity is a measure of the cloudiness of water- the cloudier the water, the greater the turbidity. Turbidity is caused by suspended solids caused by phytoplankton, human activities that disturb land such as construction that can result in high sentiment levels.

Why is turbidity important?

Turbidity is important because high turbidity in drinking water can lead to develop into gastrointestinal diseases. High turbidity in water bodies such as lakes, rivers and reservoirs, can reduce the amount of light reaching lower depths, which can inhibit growth of submerged aquatic plants and consequently affect species which are dependent on them, such as fish and shellfish.

Stormwater and turbidity

Storm water is generated when precipitation from rain and snowmelt events flows over land or surfaces and does not infiltrate into the ground. Storm water can also be caused from construction activities. As storm water flows over a construction site. HANNA offers a EPA compliant turbidity meter that will allow storm water officials to determine if they are compliant with the EPA turbidity limitation.

Turbidity of water is an optical property that causes light to be scattered and absorbed, rather than transmitted. The scattering of light that passes through a liquid is primarily caused by suspended solids. The higher the turbidity, the greater the amount of scattered light. Even a very pure fluid will scatter light to a certain degree; no solution will have zero turbidity. There are different measurement standards used based on applications, and with these standards are applied units. The ISO standard adopted the FNU (Formazin Nephelometric Unit) while the EPA uses the NTU (Nephelometric Turbidity Unit). Other units include the JTU (Jackson Turbidity Unit), FTU (Formazin Turbidity Unit), EBC (European Brewery Convention Turbidity Unit) and diatomaceous earth (mg/L SiO?).




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