Turbidity is a measure of water clarity and is caused by suspended particles in water. It is measured in NTU using a nephelometer, turbidimeter, or colorimeter, which measures light scattered as a beam passes through water. No suspended solids is 0 NTU, while drinking water should be below 5 NTU. Turbidity can provide an estimate of total suspended solids and is important to measure for water quality assessments.

1. Water Quality

2. Turbidity

3. Measuring Water Clarity
• Turbidity is a measure of the degree to which
the water looses its transparency due to the
presence of suspended particulates.
• A turbidity measurement could be used to
provide an estimation of the TSS (Total
Suspended Solids)

4. Importance of turbidity

5. Measurement
• Jackson turbidimeter
• Nephelo turbidimeter

7. Ways to Measure Turbidity
Turbidity is measured in NTU: Nephelometric
Turbidity Units. The instrument used for measuring
it is called nephelometer, colorimeter or
turbidimeter, which measures the intensity of light
scattered at 90 degrees as a beam of light passes
through a water sample.
In lakes or bays, turbidity is measured with a secchi
disk

8. Turbidity Values?
• Turbidity is measured in NTUs and sometimes
FTUs (Forel Turbidity Units)
• No suspended solids present is a value of O
NTU, while drinking water should be no more
than 5 NTU

9. Colour
Determining the concentration of a chemical in a solution

10. Measurement
• Platinum-Cobalt

11. Taste and odour