Emerson Solu Comp Xmt-P-FF/FI Instruction Manual download pdf (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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Emerson Solu Comp Xmt-P-FF/FI Instruction Manual Page 144

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