Chemistry Reference
In-Depth Information
Figure 9.2
On the right: portable CE instrument controlled via a touch-screen computer (the screen can be
seen on top of the instrument). The electronics and high voltage power supply are located below the computer.
The CE compartment with two sample/buffer vials and a CCD block is at the front. High voltage is applied
to the vials via electrodes located inside the two plastic insulators (black rods). On the left for comparison:
a commercial CE instrument (photograph of the working instruments from the author's laboratory).
(a)
(b)
1
3
8
9
7
5
6
8
3
4
5 6
7
9
i
2
4
9
10
3
11
iii
ii
11
9
10
3
10
11
iii
ii
i
0
5
10
15
20
25
30
8
10
12
14
16
18
20
22
24
26
28
Time (min)
Time (min)
Figure 9.3
An example of on-site analysis of phosphonic acids using a portable CE instrument. Procedure: an
aqueous solution of 75
M phosphonic acids and internal standards was sprayed over a 10 cm
2
area of sand.
After 24 h the 5 mg of the polluted sand was collected and extracted with MilliQ water;
(a) Raw elecrtopherograms; (b) Corrected elelctropherograms. (i) blank, (ii) electropherogram of the extract,
(iii) electropherogram of the standards. Peaks: 1 - cations, 2 - EOF, 3 - sodium decanoate (internal standard),
4 - pinacolylmethylphosphonic acid, 5 - 1-butylphosphonic acid, 6 - propylphosphonic acid,
7 - ethylphosphonic acid, 8 - methylphosphonic acid, 9 - lactic acid (internal standard), 10 - salicylic acid,
11- unknown. (From the authors' laboratory).
μ
