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The SIET (Scanning Ion-selective
Electrode Technique) can measure ion concentrations down to
picomolar levels but must be measured slowly at
approximately 1-2 seconds per point. This is mainly due to the
mechanical disturbance of the gradient by the electrode movement,
although the time constant of the LIX (Liquid Ion Exchanger)
electrodes is also a factor. It takes a fraction of a second to
reestablish the gradient. The electrode is stepped from one
position to another in a defined sampling routine while also being
scanned with the 3D micro-stepper motor manipulator (CMC-4).
1,2,3D or complex measurement paths are user programmable.
How
does the SIET work? -see a
movie clip |
| A
complete SIET system contains: |
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RP-1
Research Platform
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IPA-2
Ion/Polarographic Amplifier with two ion heads
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2HM-1
2 head mounting assembly with micromanipulator for
simultaneous two electrode measurements
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IEFS-1
Ion electrode filling station
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Ion
electrode kit - 2 teflon electrode holders, dri-ref. electrode
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FC-1
Faraday cage
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Sutter
P-97 pipette
puller
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