Average responses of the potentiometric sensor array towards
analyzed samples are shown in Fig. 1. As can be seen, differentiated
response is obtained for each type of sensor and beer. This situation,
with marked mix-response and differentiated signals obtained
from the different electrodes, is highly desirable for
studies with ET systems given very rich data is generated, which
is a very useful departure point.
It should be noticed that the response obtained with blank electrodes
presents a differentiated fingerprint for the different types
of beer. Also, as expected according to most relevant ions composition
of water, ISEs for Ca2+ and Na+ present a distinguished response
for the different beer classes. Also, the ISE for pH shows
an interesting response in terms of classification. On the other
hand, the sensors with generic response towards cations do not
present distinguishable signals, given the similar total amount of
cations of the beers. It is also the case of the sensors for anions,
mainly chloride and nitrate, which show similar variation of potential
for all the types of beer.