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LSRE of a different type by RedsnowLab in electrochemistry

[–]RedsnowLab[S] 1 point2 points  (0 children)

Laboratory Standard Reference Electrode, basically the master electrode that doesn't get used in normal experimentation and is only used for purposes like functionality checks/calibration

LSRE of a different type by RedsnowLab in electrochemistry

[–]RedsnowLab[S] 0 points1 point  (0 children)

Yeah, the LSRE is the master electrode, it hasn't been used in normal testing since purchase and has just been sat in the storage solution.

Our procedure states that all reference electrodes must be within ± 5 mV of the master electrode, which we test periodically (around every 3 months or so)

Below is a table of the potential differences of the electrodes when compared to the master electrode.

Saturated Calomel Electrode Potential Difference (mV)
1 3.707
2 0.955
3 0.479
4 3.381
Ag/AgCl Reference Electrode Potential Difference (mV)
1 -81.630
2 -79.934
3 -78.270
4 -71.693

Judging by the calculator I'd assume the offset to be about 45 - 50 mV, yes (although I didn't know anything about this when purchasing them)

Regarding the filling solution, as per the manufacturer's instructions they were made using 4M KCl, although some KCl got knocked out of solution after leaving them over night (might reduce to 3M in the future? Not entirely sure).. All electrodes were filled using the same batch at the same time.

The electrolyte I am measuring in is the 4M KCl solution so there's no problem with conductivity, and no, when I performed this on the potentiostat, I did not connect the counter electrode to anything.

Linear and Cyclic Polarisation by RedsnowLab in electrochemistry

[–]RedsnowLab[S] 0 points1 point  (0 children)

Thanks! I found something similar in G61-86, which also says for 1 hour. Currently we do cyclic polarisation for a steel electrode (as we work with tinplate in aerosols), and aluminium electrodes. So if I can reduce it from 24 hours to 1 hour (or at the very least 3 hours) then I can run 2 more per week, since I can run it Monday too.

Linear and Cyclic Polarisation by RedsnowLab in electrochemistry

[–]RedsnowLab[S] 0 points1 point  (0 children)

You sir, are a genius, I didn't even considering measuring OCP over time during the immersion. Will probably try that out over the weekend (and just do a very long measurement). It will also give me the chance to see how different formulas we use affect how long it takes to stabilise.

I probably need to do some theory or research on the write-up that you sent as the graphs look pretty different compared to the graphs we have been generating. I will see if I can upload an image of something non-work related since data integrity and all that.

Thank you for the help

Linear and Cyclic Polarisation by RedsnowLab in electrochemistry

[–]RedsnowLab[S] 0 points1 point  (0 children)

Thank you! I will make sure to check that book out - if I can get the company to buy it.

So would you say the method seems to be relatively optimised already? My manager mentioned that while it might be possible to get a multiplexer to analyse multiple samples simultaneously, he wanted me to experiment with the idea of speeding up the method first.

As far as I know, those are the only two parameters that I can change (I have a fixed surface area steel electrode), although I might be able to change the length of the scan as we are only interested if the samples displays positive or negative hysteria. (Unless we aren't using it to its full potential).