CHAPTER 18 . Affinity Electrochemical Biosensors for Pollution Control
Fig. 18.4. a Chronopotentiograrns
for (a) calf thymus ssDNA
modified screen printed electrodes and followed by an increasing PCB 105 concentration,
(b) 0.2mgr',(c) 0.6mgr',
(d) 1 mg r'; b Calibration
curves obtained increasing the
concentration of PCB 105. The
results correspond to the difference between the guanine peak
area after interaction with
PCB 105 minus that obtained
for the buffer solution. Calf
thymus ssDNA immobilization:
20 mg r', calf thymus ssDNA
for 2 min at +0.5 V vs. SCE. PSA
transduction: in 0.2 M acetate
buffer pH 5.0 with a stripping
constant current of +6 flA and
an initial potential of +0.5 V
Table 18.3. Results of the
water samples obtained using
a standard method with a
Varian 3400 gas chromatograph coupled to a Finningan
Mat 800 ion trap detector
mass spectrometer (GC-ITDMS)
1.20
:=- 0.80
:>
~
~
.!Q
0;S
!II
~
!II
..><:
0.40
10
o
al Co -10
<]
ClJ
c::
.i:
!II
:::l
I.!l -20
1.00
1.05
E(V)
1.10
b
~
1----1
-30 '~ __ ~~ __ ~ __ L-~ __ L-~ __ ~~ __ -L~
0.0
0.2
0.4
0.6
0.8
1.0
PCB 105 (mg 1-')
a
b(ngr')
c(ngr')
d(ngr')
Desetil-terbutilazine
0
12
21
Carbofuran
0
210
101
Simazine
0
0
23
Terbutilazine
79
28
81
Etofu mesate
6
184
83
Alachlor
0
0
27
Metolachlor
7
14
225
421
1.15