SHUTTING
DOWN THE COULOMETER
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Turn off both
cell power switches and the heater power. |
![Turn power off; link to larger image](../Images/Coulom/Hardware/Thumbnails/celloff2.JPG) |
Unplug the electrodes and
remove the titration cell.
Replace the jumper cable
between the cell current outlet terminals.
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![Replace red jumper to outlet; link to larger image](../Images/Coulom/Hardware/Thumbnails/celloff2.JPG) |
Remove traps by untaping
Teflon seals, removing connector tubes, and taking the trap out of the
holding unit.
Do not remove the KOH trap
until it becomes frothy -
it then needs to be disposed of and replaced with new solution.
Replace the sample vial
with an empty vial.
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![Screw an empty vial into the cap; link to larger image](../Images/Coulom/Set_up/Thumb/scrwcap2.JPG) |
Turn off the N2
gas at the main gas valve and on the flow control knob on the
heating unit.
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![Turn off main valve of tank; link to larger image](../Images/CHN/Hardware/Thumbnails/gas2.jpg) |
Turn off the water bath
- set back to original temperature used for the XRD (26 degrees) - see
Larry Poppe.
Make sure the source valve is closed before the return valve.
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![Turn off water bath; link to larger image](../Images/Coulom/Hardware/Thumbnails/ONchill2.JPG) |
Dispose of chemicals in
their proper waste receptacles.
KI can be rinsed down the
drain with copious amounts of water.
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![Waste bottles](../Images/Coulom/Chemicals/Thumbnails/Wasteb2.JPG) |
Clean all glassware with
a Milli-Q water rinse.
Occasionally, you may need to clean the glassware with Chromerge (Chromic/Sulfuric
Acid mixture) to remove any particles adhering to the frit.
Use a syringe to run Milli-Q
water through the traps.
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![Chromerge in hood](../Images/Coulom/Chemicals/Thumbnails/Chrom2.JPG) |