A method for measuring a target constituent of an electroplating solution using
an electroanalytical technique is set forth in which the electroplating solution
includes one or more constituents whose by-products skew an initial electrical
response to an energy input of the electroanalytical technique. The method comprises
a first step in which an electroanalytical measurement cycle of the target constituent
is initiated by providing an energy input to a pair of electrodes disposed in the
electroplating solution. The energy input to the pair of electrodes is provided
for at least a predetermined time period corresponding to a time period in which
the electroanalytical measurement cycle reaches a steady-state condition. In a
subsequent step, an electroanalytical measurement of the energy output of the electroanalytical
technique is taken after the electroanalytical measurement cycle has reached the
steady-state condition. The electroanalytical measurement is then used to determine
an amount of the target constituent in the electroplating solution. An automatic
dosing system that includes the foregoing method and/or one or more known electroanalytical
techniques in a close closed-loop system is also set forth.