Turbidity Methods Comparison

Comparison of Turbidity Measurement Methods

Turbidity is the measure of the clarity of water. This haziness or cloudiness of water is caused by a large number of usually very small suspended particles. 

In drinking water high turbidity can increase the risk of gastrointestinal diseases because viruses and bacteria can attach to the particles in turbid water. High turbidity will reduce the effectiveness of disinfectants like chlorine so turbidity should be lowered as much as possible before disinfecting.

Turbidity tubes and Secchi disks rely on users' eyesight therefore results will be affected by changes in sunlight conditions, choppy water, time of day, and human error. They also cannot be accurately used in very low turbidity samples (<5 NTU)

Photometers & other turbidity meter are electronic devices that measure the absorbance of wavelengths of light in liquids. They are ideal for collecting accurate results, especially in small samples, but can be more expensive than other measurement methods and require power to operate. 


Pro

Con


Turbidity Tube

  • Cheap
  • Simple to use
  • Tough
  • User bias (inaccurate/inconsistent)

Turbidity Meter (Photometer or Colorimeter)

  • Accuracy (especially at low levels <5 NTU)
  • Consistency
  • Fast
  • Price
  • Some can be complicated to use
  • Requires power
  • Can be fragile
  • Small sample size (more variance)

Secchi disk

  • Cheap
  • Simple to use
  • Large sample size (less variance)
  • Not suitable for small samples
  • User bias (inaccurate/inconsistent)


Test Kit

  • Cheap
  • Requires consumables

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  1. Turbidity Tube
    Turbidity tube, measures between 10-400 NTU. Learn More
    A$93.50
  2. Apera TN400 Portable Turbidity Meter Kit

    Backorder: Typically ships in 2-3 days.

    The Apera Instruments TN400 Portable Turbidity Meter, Large Colored TFT display with graphic and text guides, Accuracy: ±1% or 0.02 NTU, whichever is greater

    • Infrared light source -- ISO7027 compliant
    • Easy and quick calibration
    • TFT Colored Screen (measurement mode, green in calibration) with graphic and text operation guides
    • U.S. EPA certified, non-toxic, easy-to-use AMCO Clear® polymer standard solutions
    • CE certified and comes with 2-Year Warranty
    Learn More
    A$1,424.50
  3. TN500 Portable White Light Turbidity Meter Kit

    Backorder: Typically ships in 2-3 days.

    Apera TN500 uses tungsten filament lamp as the light source and 90° scattering method, which is compliant with U.S EPA 180.1 method for the determination of turbidity in drinking, ground, surface, and saline waters, domestic and industrial wastes. The instrument is designed for water quality professionals, offering long-term reliability in high-accuracy turbidity measurement with an intuitive operation system, simple calibration, and GLP data management.

    Learn More
    A$2,084.50
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