
55-26 Chemical Variables
Shorter analysis times are achieved if very short and relatively large rectangular pulses with a dura-
tion
t
p
= 5–10 ms and an amplitude of ∆E = 50 mV are superimposed on a stepped potential ramp with
th
e
sa
me
du
ration
bu
t
sm
aller
po
tential
st
eps
of ab
out
10 mV. e po
tential
ca
n
th
en
be sc
anned
at
ex
tremely
hi
gh
ra
tes
of up to 12
00
mV s
−1
. However, the sensitivity decreases because the ratio of fara-
daic
to c
apacitive
c
urrents
i
s
l
owered
b
y
t
he
s
hort
p
ulse
t
imes
.
Di
erential Pulse Voltammetry: Dierential pulse methods
ar
e
th
e
mo
st
im
portant
on
es
in an
alytical
vo
ltammetry
. Pe
riodically
re
peated
re
ctangular
vo
ltage
pu