Accurate measurement and reporting of pH data
has been a long-standing problem due to the
effects of temperature. An increase in any
solutions’ temperature will cause a decrease in
its viscosity and an increase in the mobility of its
ions in solution. An increase in temperature may
also lead to an increase in the number of ions in
solution due to the dissociation of molecules
(this is particularly true for weak acids and
bases). As pH is a measure of the hydrogen ion
concentration, a change in the temperature of a
solution will be reflected by a subsequent change
in pH(1).
In addition, changes in temperature will also
have an influence on the measuring senosr used.
Overall, the effects of temperature can be
divided into two main categories:
• Temperature effects that diminish the
accuracy and speed of response of the
Electrode.
• Temperature Coefficient of Variation effects
on the material being measured by the
sensor, whether it be calibration buffer or
sample.
Further sub-classification is necessary for each
of these categories in order to understand the
cause of the problem and determine the optimal
remedial action.
Temperature plays a significant role on pH measurement. This is a well-know fact for most users of pH test equipment. However, the temperature affects not only your sensor but also your sample. All solutions will change their pH value with temperature. This is a result of the shifting of the chemical equilibrium of the components, mainly of dissociation.
Accurate measurement and reporting of pH datahas been a long-standing problem due to theeffects of temperature. An increase in anysolutions’ temperature will cause a decrease inits viscosity and an increase in the mobility of itsions in solution. An increase in temperature mayalso lead to an increase in the number of ions insolution due to the dissociation of molecules(this is particularly true for weak acids andbases). As pH is a measure of the hydrogen ionconcentration, a change in the temperature of asolution will be reflected by a subsequent changein pH(1).In addition, changes in temperature will alsohave an influence on the measuring senosr used.Overall, the effects of temperature can bedivided into two main categories:• Temperature effects that diminish theaccuracy and speed of response of theElectrode.• Temperature Coefficient of Variation effectson the material being measured by thesensor, whether it be calibration buffer orsample.Further sub-classification is necessary for eachof these categories in order to understand thecause of the problem and determine the optimalremedial action. Temperature plays a significant role on pH measurement. This is a well-know fact for most users of pH test equipment. However, the temperature affects not only your sensor but also your sample. All solutions will change their pH value with temperature. This is a result of the shifting of the chemical equilibrium of the components, mainly of dissociation.
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