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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 turbidimeterMeasurement 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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