the combination electrode is the part of the ph probe that is sensitive to hydrogen ion concentration.
the combination electrode is the part of the ph probe that is sensitive to hydrogen ion concentration.
what part of the ph probe is sensitive to hydrogen ion concentration?
the combination electrode
an isfet electrode sensitive to h concentration can be used as a conventional glass electrode to measure the ph of a solution. however, it also requires a reference electrode to operate. if the reference electrode used in contact with the solution is of the agcl or hgcl classical type, it will suffer the same limitations as conventional ph electrodes (junction potential, kcl leak, and glycerol leak in case of gel electrode). a conventional reference electrode can also be bulky and fragile. a too large volume constrained by a classical reference electrode also precludes the miniaturization of the isfet electrode, a mandatory feature for some biological or "in vivo" clinical analyses (disposable mini-catheter ph probe). the breakdown of a conventional reference electrode could also make problem in on-line measurements in the pharmaceutical or food industry if highly valuable products are contaminated by electrode debris or toxic chemical compounds at a late production stage and must be discarded for the sake of safety.
isfet
bullet::::- the oxygen binding effectiveness of hemocyanin in the blue crab "callinectes sapidus" varies according to the concentration of two factors, calcium ion concentration, and hydrogen ion concentration. when these concentrations are varied in the same direction, they have a counterbalancing effect. to stabilize oxygen binding at low ionic concentrations, the crab increases its internal ph (decreasing the hydrogen ion concentration) to allow the hemocyanin to continue to function efficiently.
enantiostasis