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Question

A turbidimeter using blue cobalt plate is :

A
Tube turbidimeter
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B
Plate turbidimeter
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C
Baylis turbidimeter
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D
Jackson turbidimeter
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Solution

The correct option is D Jackson turbidimeter
Measurement of turbidity is done using the following :
(a) Turbidity rod
(b) Jackson turbidimeter
(c) Baylis turbidimeter
(d) Nephelometer
Baylis Turbidimeter
  • It consists of a closed galvanized iron box, on one side of which, two glass tube can be held vertically side by side.
  • On the other side, in front of the tubes, a 250 watts electric bulb is located with a reflector, so as to throw light on the tube.
  • The glass tube are supported at bottom by a white opal glass plate and surrounded by blue cobalt plates.
  • One of the two glass tube is filled with water sample and other is filled with standard water sample of known turbidity.
  • Match test sample with different standard water sample till colour of both the tubes is same.


Jackson's Turbidimeter
  • In this method, the level of water kept in jar is increased till the image of flame kept at bottom of jar ceases to be seen.
  • It is used when turbidity is greater than 25 ppm.
  • It is a laboratory method.
  • This method is not used for drinking water.
Nephelometer
  • A technique to measure level of light scattered by the particles at right angles to the incident light beam.
  • The unit of expression is NTU (Nephelometer turbidity unit).
Hence, NTU is based on scattering principle.
  • The turbidity unit is also sometimes known as FTU (formazine turbidity unit).
Turbidity Rod
  • Rod with platinum needle is inserted inside water and the depth at which platinum needle just becomes invisible gives turbidity in ppm.
  • As depth of insertion increases, reading will decrease.
  • It is a field method.

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