Emerson Solu Comp Xmt-P-FF/FI Manuel d'instructions Page 144

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The dashed vertical lines are the measured cell voltages
for the buffers and the sample. The contribution from each
term in equation 4 is shown. The buffers are are assumed
to have identical liquid junction potentials. Because most
buffers are equitransferant, i.e., the mobilities of the ions
making up the buffer are nearly equal, assuming equal liq-
uid junction potentials is reasonable. In the figure, the liq-
uid junction potential of the sample is greater than the
buffers. The difference gives rise to an error in the meas-
ured pH.
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