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Sometimes, conductivity measurements are linked with other methods to increase the sensitivity of detection of specific types of ions. For example, in the boiler water technology, the boiler blowdown is continuously monitored for "cation conductivity", which is the conductivity of the water after it has been passed through a cation exchange ...
Typically, there are three major types of conductivity measurements used: Specific conductivity, a measurement that indicates the total dissolved solids in an aqueous solution; Cation conductivity, a measurement taken after the water sample has flowed through a resin bed (known as a cation exchanger)
Electrical conductivity of water samples is used as an indicator of how salt-free, ion-free, or impurity-free the sample is; the purer the water, the lower the conductivity (the higher the resistivity). Conductivity measurements in water are often reported as specific conductance, relative to the conductivity of pure water at 25 °C.
Specific conductivity gives overall conductivity value of the sample and is the most generic measurement Cation conductivity is conductivity measurement after the Cation Column. At the Cation Column, the H+ resins replace the positive ions of all dissolved matter in the solution.
κ is the measured conductivity (formerly known as specific conductance), [3] c is the molar concentration of the electrolyte. The SI unit of molar conductivity is siemens metres squared per mole (S m 2 mol −1). [2] However, values are often quoted in S cm 2 mol −1. [4]
For reaction between a weak acid and a weak base in the beginning conductivity decreases a bit as the few available H + ions are used up. Then conductivity increases slightly up to the equivalence point volume, due to contribution of the salt cation and anion of the weak acid as it is formed from and the neutral acid (This changing contribution ...