Additive-salt effect on low detection limit and slope sensitivity in response of potassium- and sodium-selective neutral carrier based electrodes andtheir liquid-membrane based ion-sensitive field-effect transistor
S. Wakida et al., Additive-salt effect on low detection limit and slope sensitivity in response of potassium- and sodium-selective neutral carrier based electrodes andtheir liquid-membrane based ion-sensitive field-effect transistor, ANAL SCI, 15(1), 1999, pp. 47-51
The remarkable effect of additive salts on low detection limits as well as
slope sensitivities were observed for the response characteristics of bis(c
rown) and valinomycin based poly(vinyl chloride) (PVC) membrane electrodes.
The low detection limits and the slope sensitivities for bis(crown) and va
linomycin based PVC membrane electrodes were improved apparently as the hyd
rophobicity of the additive salts increases. In order to clarify the effect
of additive salts of the PVC membrane electrodes, the response characteris
tics of liquid-membrane based K+ and Na+-ISEs, which were fabricated by usi
ng micro-ion-sensitive field-effect transistors (mu-ISFETs), were evaluated
. The low detection limits and the slope sensitivities in the responses of
the neutral-carrier based K+ and Na+-mu-ISFETs also changed remarkably with
the kind as well as the concentration of the additive salts.