A common source of error in pH measurements.

@article{Illingworth1981ACS,
  title={A common source of error in pH measurements.},
  author={J A. Illingworth},
  journal={The Biochemical journal},
  year={1981},
  volume={195 1},
  pages={259-62}
}
Glass-electrode assemblies in which the reference half-cell contains a porous ceramic type of liquid junction are likely to produce misleading pH measurements under normal service conditions. The error arises from substantial liquid-junction potentials, associated with the porous ceramic plug, which vary with the ionic composition of the solution under test. The error is not revealed by conventional two-point calibration procedures, since the majority of standard buffer solutions have a similar… CONTINUE READING

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