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We have had an ongoing debate in our lab and several bad pH electrodes. I would like to ask the following question

Do paraformaldehyde soloutions (2-4% w/v) damage pH meter electrodes?

If so, why?

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  • $\begingroup$ One would expect that the oligomers block up the membrane in the electrodes. Keeping them in an acidic solution for a while might help, polyformaldehyde degrades to formaline under acidic conditions. $\endgroup$ – Karl Oct 13 '15 at 21:24

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