hello, for the Redox buffer solutions, what is the uncertainty that we can

Your questions about pH and Redox probes for swimming pools

ph-redox-pool.com

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bot: Question FR Dec 21, 2022, 11:42 am

. If you have any questions, please let us know.

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Dec 21, 2022, 11:43 am

hello, for Redox buffer solutions, what is the uncertainty that we can accept? THANKS

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Olivier Michaud Dec 21, 2022, 11:45 am

Our solutions are at +/- 5 mV, on the other hand at the measurement level +/- 50 mV without worries

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Dec 21, 2022, 11:46 am

ok, the same value (+/- 50mV) for +220mV and +468 mV?

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Olivier Michaud Dec 21, 2022, 11:47 am

Yes

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Olivier Michaud Dec 21, 2022, 11:47 am

Redox measurement is very volatile

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Dec 21, 2022, 11:49 am

What does very volatile mean?

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Olivier Michaud Dec 21, 2022, 11:50 am

The measured values ​​may vary frequently. What is your concern?

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Dec 21, 2022, 11:52 am

My concern is that when I test buffer solutions, my values ​​have moved constantly. and sometimes I have values ​​+60mv compared to the reference value

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Dec 21, 2022, 11:53 am

so I don't know under what conditions I can have stable values

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Olivier Michaud Dec 21, 2022, 11:55 am

Do this: Leave the probe soaked for 4 hours in the standard solution, and come and see the value every hour. See if it moves. If it still moves then it may be a tired probe! a probe is a battery, if it no longer has enough energy then it gives very unstable values.

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Dec 21, 2022, 11:58 am

ok I will try your idea, thank you very much for your advice, I wish you a great day.

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Olivier Michaud Dec 21, 2022, 11:58 am

You are welcome, do not hesitate to contact us! Good day

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Dec 21, 2022, 11:59 am

Yes, I will come back to you. THANKS

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Dec 21, 2022, 12:11 pm

Hello again, excuse me, I have a question just arrived

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Olivier Michaud Dec 21, 2022, 12:11 pm

No worries

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Dec 21, 2022, 12:13 pm

The interval that you told me +/-50mV is applied in all measurement conditions (I mean in a swimming pool as in the lab for a small 250ml flask or a 2l, 5l, 20l fermenter?

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Olivier Michaud Dec 21, 2022, 12:14 pm

No, this is what I observe in the case of swimming pools

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Dec 21, 2022, 12:16 pm

Ah ok, so if I test my redox probes with the buffer solutions at +220mV and +468mV the range of +/-50mV is still good?

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Olivier Michaud Dec 21, 2022, 12:17 pm

Yes . but you also need to calibrate

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Dec 21, 2022, 12:18 pm

Yes I calibrate before measuring, just to see if my probes are still good

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Olivier Michaud Dec 21, 2022, 12:19 pm

OK

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Dec 21, 2022, 12:19 pm

thanks again