
55-21Electrochemical Composition Measurement
as a function of the volume of titrant added. The titrant has to be chosen such that the reaction
pr
oduct
is no
t
re
ducible
or ox
idizable
at th
e
ap
plied
po
tential
an
d,
he
nce,
do
es
no
t
co
ntribute
to
th
e
cu
rrent
.
If th
e
an
alyte
an
d
th
e
ti
trant
ar
e
el
ectroactive
at th
e
ap
plied
po
tential,
th
en
th
e
cu
rrent
o
w
wi
ll
be
la
rge
at th
e
be
ginning
of th
e
me
asurement
an
d
de
creases
li
nearly
wi
th
th
e
vo
lume
of th
e
ti
trant
ad
ded,
be
cause
bo
th,
th
e
an
alyte
an
d
th
e
ti
trant,
ar
e
co
nsumed
by th
e
re
action
. e co
ncentration
of el
ectroac-
tive
sp
ecies
th
en
di
minishes
un
til
th
e
an
alyte
is tot
ally
co
nsumed
. Fu
rther
ad
dition