Abstract: Apparatus and methods for monitoring of dissolved (ionic) heavy metal residuals in liquid process stream or liquid waste (effluent) streams, as examples, after recovery and collection of such metals from a laboratory, medical, industrial or manufacturing process stream. An automatic controller is employed to deliver a sample volume of liquid from the stream to a measurement chamber, adjust the conductivity of the sample volume within the measurement chamber to a predetermined conductivity at a predetermined conductivity measurement temperature, employ an ion specific electrode and a reference electrode to make a voltage measurement representative of the concentration of specific metal ions within the sample volume at the predetermined concentration measurement temperature, record the voltage measurement, and flush the measurement chamber.