Ocean Optics OOISensors - Manual (Page 129)

Appendix C
pH Sensor Theory of Operation
and Calculations
Overview
The following sections contain the equations that express the theory of pH sensor operation and
calculations.
Theory of Operation and Calculations
− + + ⇔ A H HA
] log[ + − = H pH
] [
] ][ [
HA
H A
K
+ −
=
] log[ ] log[ ] log[ log + − − − = − = H A HA K pK
⇓
] log[ ] log[ HA A pK pH − + = −
or
] [
] [
log
HA
A
pK pH
−
+ =
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