Improved dynamic response of potentiometric ammonia sensors using pure teflon membranes

Several microporous membrane parameters are investigated in an attempt to improve the dynamic response of ammonia gas-sensing electrodes. Parameters of interest include hydrophobic and support membrane porosities as well as support polymer composition. Results show that the electrode recovery process represents the major component of the total dynamic response and that, of the teflon membranes currently available, the 0.02-μm pure teflon membrane is the membrane of choice for these electrodes.