- ultimate
robustness
- no trapping
of air bubbles
- easy ‘plug
and play’ installation
After the recently introduced
HyREF reference
electrode for the VT-03 flow cell we now launch the Ag/AgCl version
of this ‘in situ’ type of reference electrode. Characteristic for
these in situ electrodes is the integrated design which makes inclusion
of bubbles in the flow cell virtually impossible and maximises robustness.
The ISAAC is easily refurbished by the supplied reference electrode
solution which guarantees a superior longevity. We trust that the
ISAAC will further contribute to the superb performance and convenience
of our VT-03 flow cell.
Recommendations
With the introduction of the ISAAC, three different reference electrodes
are available with our flow cells, each with specific advantages.
We consider the ISAAC reference electrode as an excellent choice in
combination with our flow cells because of its well-defined potential,
the wide acceptance in electrochemistry and the ease of use.
The ISAAC requires addition of 2 mmole/l chloride to the mobile phase,
which results in a few restrictions. At a high working potential (>
1.2 V) Cl- is oxidised and contributes to the background current.
In ion chromatography the addition of Cl- may lead to undesired chromatographic
changes. In case of a silver working electrode, the addition of Cl-
to the mobile phase will cause formation of an AgCl coating on the
working electrode leading to inactivation.
The salt bridge Ag/AgCl reference electrode has been our standard
for many years. It has proven to be a highly reliable concept and
is advised in cases where the addition of Cl- to the mobile phase
is not possible or wanted.
The HyREF is a hydrogen reference electrode, its potential is depending
on the pH of the mobile phase. The HyREF is particularly useful for
applications where both Ag/AgCl reference electrodes are difficult
to use i.e. at a high pH (>11) or high modifier percentages (>80%).
Examples are the analysis of carbohydrates at pH 12 or fat-soluble
vitamins at 98% methanol. In terms of S/N ratio the three reference
electrodes are comparable.
VT-03 cells with glassy carbon working electrode:
|
Part no.
|
Description |
| 110.4205 |
VT-03 flow cell, 3 mm GC
WE, ISAAC |
| 110.4215 |
VT-03 flow cell,
2 mm GC WE, ISAAC |
| 111.4205 |
µ-VT-03 flow cell, 0.7 mm
GC WE, ISAAC |
VT-03 cells with metal working electrode:
|
Part no.
|
Description |
| 110.4220 |
VT-03 flow cell, 3 mm Pt WE, ISAAC |
| 110.4225 |
VT-03 flow cell,
3 mm Au WE, ISAAC |
| 110.4230 |
VT-03 flow cell, 2 mm Ag WE, ISAAC |
| 110.4235 |
VT-03 flow cell,
3 mm Cu WE, ISAAC |
For a complete listing of cells see
VT-03 flow cells.
|
