Anions such as SCN−, Br− or EDTA and I− were studied
as regenerating reagents. It was found that EDTA and
Br− and SCN− were not useful for this study and the best
result was obtained by applying I−, which gave short membrane
regeneration times (1–4 min). To study the influence
of I− concentration on the optode response to Hg2+ ions,
solutions of KI of different concentrations were used in the
range of 10−1 to 10−3 M. It was observed that the lower I−
concentration, the longer was generation time of the sensor
while the higher I− concentration caused low response of
the sensor. A 10−2 M