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  2. Turbidity - Wikipedia

    en.wikipedia.org/wiki/Turbidity

    Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air.The measurement of turbidity is a key test of both water clarity and water quality.

  3. Wastewater quality indicators - Wikipedia

    en.wikipedia.org/wiki/Wastewater_quality_indicators

    Settleable solids are measured as the visible volume accumulated at the bottom of an Imhoff cone after water has settled for one hour. [2]: 89–98 Turbidity is a measure of the light scattering ability of suspended matter in the water. [2]: 131–137 Salinity measures water density or conductivity changes caused by dissolved materials.

  4. Secchi disk - Wikipedia

    en.wikipedia.org/wiki/Secchi_disk

    The disc is mounted on a pole or line and lowered slowly down in the water. The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity. Since its invention, the disk has also been used in a modified, smaller 20 cm (8 in ...

  5. Water quality - Wikipedia

    en.wikipedia.org/wiki/Water_quality

    Many water utilities have developed systems to collect real-time data about source water quality. In the early 21st century, a variety of sensors and remote monitoring systems have been deployed for measuring water pH, turbidity, dissolved oxygen and other parameters. [37]

  6. Water clarity - Wikipedia

    en.wikipedia.org/wiki/Water_clarity

    Three glass vials used as turbidity standards for 5, 50, and 500 nephelometric turbidity units (NTU). Turbidity is a measure of the cloudiness of water based on light scattering by particles at a 90-degree angle to the detector. A turbidity sensor is placed in water with a light source and a detector at a 90-degree angle to one another.

  7. Freshwater environmental quality parameters - Wikipedia

    en.wikipedia.org/wiki/Freshwater_environmental...

    Unfortunately neither colour nor turbidity are strong indicators of the overall chemical composition of water. However both colour and turbidity reduce the amount of light penetrating the water and can have significant impact on algae and macrophytes. Some algae in particular are highly dependent on water with low colour and turbidity.

  8. Water testing - Wikipedia

    en.wikipedia.org/wiki/Water_testing

    Participants learn how to conduct simple water quality tests, analyze common indicators of water health, specifically dissolved oxygen, pH, temperature, and turbidity. The program was originally called "World Water Monitoring Day" and later "World Water Monitoring Challenge", and was established in 2003.

  9. ISO 7027 - Wikipedia

    en.wikipedia.org/wiki/ISO_7027

    ISO 7027:1999 is an ISO standard for water quality that enables the determination of turbidity. [1] The ISO 7027 technique is used to determine the concentration of suspended particles in a sample of water by measuring the incident light scattered at right angles from the sample.

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