These
detectors proved to have short time constants and sufficient
long-term stability. The ring-shaped surface of the composite
electrode was exposed to the solution stream resulting in a
nearly undisturbed flowof the solution. Hydrochloric acid and
acetic acid were titrated by injection of samples into a sodium
hydroxide carrier solution. The dynamic measuring range of
the detector for this kind of titrations using 150L-injection
volumes was about 4 orders of magnitude. The detection
limit is almost ten times lower than for titrations
using color indicators and spectrophotometric detection