Water Quality Control by Means of Measuring the Specific Electrolytic Conductivity

Abstract

AbstractResults of investigations on the basis of series of measurements having been performed for many years on the electrolytic conductivity in several waters with different degrees of pollution have shown a good correlation between residue from evaporation and conductivity. For concentrations of more than 2500 mg/l chloride these functional relations loose their validity. Because of this finding, the routine investigations of the residue from evaporation in the laboratory were stopped. Comparative measurements of residue from evaporation and conductivity which were repeated after a few years indicated deviations between 0.5 and 8 %. Limited artificial additions of salt, acid, base and thawing salt caused linear changes of the conductivity of the water samples, so that in continuous water quality control systems respective disturbances will be automatically signalled and transmitted and the extent of the pollution can be determined quantitatively with the aid of integral calculus.