Measuring vAg - preliminary results!

[Kirk Keyes]

Awww, man! I was all excited seeing there was some action in this thread about vAg and it turns out it's just banter about 120 paper...

[JOSarff]

I am now at the point of being able to replicate results to within about +/- 5 mv, but with a slope adjustment as the solution becomes more dilute. I am working on that. It may be due to having immersed too little of the billet in the electrolyte.

Here are photos of the reference electrode, the billet, the bridge and a trial setup of a beaker ready for precipitation of a real emulsion. The reference electrode is immersed in its conditioning/storage solution, and the bridge is also immersed in its own gel/salt storage solution. The bridge is marked as to polarity and the salt that it is to be used with. These are two critical items in this measurement.

The making beaker in the 4th picture contains 2 inlet lines for salt and Silver, a temperature probe, the plated Silver billet, and the bridge. The bridge is a mockup in this but not in the other picture. The bridge is connected to the salt solution beaker on the far right which contains the reference electrode.

The pump is partially seen to the far left.

Both electrodes are connected to the VOM. It is then connected to a PC with a cable and data logging can be carried out as a function of time.

PE

Ron:

I'm slightly confused as how the bridge attaches to the meter,

Joe

[Photo Engineer]

Joe;

The bridge does not attach to the meter. The two electrodes attach to the meter and the bridge "bridges" the circuit between two beakers. One is the beaker in which you are making the emulsion and the other is the beaker that you have one of the electrodes in and which contains a buffer solution.

One electrode, in the making beaker, is made of silver metal and the other, in the buffer is a Silver, Silver Chloride double junction reference with the part # given elsewhere in this thread or forum.

The bridge is tubing which contains thickened salt.

PE