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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
7-11Needle-Type Environmental Sensors
7.4 Potentiometric Microsensors
Most ion-selective microsensors are potentiometric sensors where the voltage (mV generated vs. Ag/AgCl)
is th
eoretically
de
pendent
on th
e
lo
garithm
io
nic
ac
tivity,
acc
ording
to th
e
Ne
rnst
eq
uation
(E
quation
7.2)
:
E E E E E
cell external ref internal ref membrane junction
= + +
. .
= + +
( )
( )
E
RT
ZF
A
A
E
i
i
jref
external
internal
ln
ln
.
log
( ) ( )
= + =
+k
RT
ZF
A k
Z
C
i isample sample
0 059
(7.2)
where
E
cell
is the potential dierence between the ion-selective microsensor and the reference electrode
E
membrane
is the membrane potential
E
external ref.
and E
internal ref.
are potentials of the exter ...
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Publisher Resources

ISBN: 9781439848913