Determination of Electrical Conductivity of Water

August 23, 2017August 21, 2019 ReadCivil 3 Comments Determination of electrical conductivity of water

Hi readers.Today we are going to discuss the determination of electrical conductivity of water.Before that, we must know what is electrical conductivity of water.

The electrical conductivity of an aqueous solution is its ability to carry an electric current, which depends on the ions present and their concentration and mobility. Most inorganic compounds, dissolved in water are good conductors.

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Conductance of a solution, G, is directly proportional to the surface area of the electrode, A cm2 and inversely proportional to the distance between the electrode, L cm.

Principle of electrical conductivity experiment

G α (A/L) or G = k(A/L)

where k is called conductivity or specific conductance and the unit of k is mho/cm

Assuming the conductivity of a solution is mainly due to the dissolved solids, the value of electrical conductivity can be used to get an indirect result of total dissolved solids by the following equation.

Total Dissolved Solids (TDS) in mg/L = 0.64 X Electrical Conductivity in µmho/cm

Determination of electrical conductivity of water — Water conductivity meter

Procedure for measuring the conductivity of water

The below steps gives details about how to measure the electrical conductivity of water.

Calibrate the conductivity meter as per the directions were given by the manufacturer’s manual using standard solutions.
Rinse the cell with the sample, measure the sample resistance or conductivity.
Measure the total dissolved solids (TDS) using the TDS mode of the meter.

Result