a) Different redox determination methods respond to different redox sensititve and redox determination components
b) There are different protocols at different laboratories for the application of redox electrodes
c) Calculation of redox states based on analytical data of presumably coupled redox sensitive components suffer under uncertainty
d) In calculations based on analytical data it is unclear which components are in redox equilibrium
e) The timely response redox measurements depend on the kinetics of involved reactions and electrode surface properties.
f) The timely response to external changes of the redox conditions of near natural and real systems depends on the deviation from equilibration of the overall system.