glass electrode (ion-specific electrode, ISE)

Glass electrodes are made from specially formulated glass consisting of a melt of silicon dioxide with added oxides of various metals. Membranes with varying composition of the glass & with directed selectivity for H⁺, Na⁺, K⁺, Li⁺, Rb+, Cs+, Ag+, Tl+ & NH₄⁺ have been prepared. The membranes generally have a thickness of 10-100 uM. Depending upon the type of glass, their electrical resistance is very high (about 10-100 M Ohms at room temperature) & increases considerably as the temperature decreases.

Specific

H+-selective glass electrode (pH electrode) Na+-selective glass electrode pCO2 electrode

References

Tietz Textbook of Clinical Chemistry, 2nd ed. Burtis CA & Ashwood ER (eds), WB Saunders Co, Philadelphia PA, 1993, pg 168