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pH meter resuscitation
Hi again,
Today I managed to beg borrow + steal two pocket pen pH meters from my school
chemistry department. They have been in the professors desk drawer for some
time and they were pretty dusty and totally dried out (crud all over the
probes). They are small Hanna types - one is the pHep+ and the other just
says pH on it (but is exactly the same design). I know you're not supposed to
let Hanna meters dry out, but the pHep+ actually seems to work, I calibrated
it at pH 7.0 and it gave moderately stable readings in my tanks that were the
same general area as the pH test kit results. My question is, I remember
reading sometime ago about a method for reactivating worn out probes by
soaking them in a solution of (could have been) KCl. Do those who know, think
that this will be necessary for these meters? And could someone e-mail me
offlist and tell me how they work? I know they use a platinum wire for
something or other, and on the pHep+, that looks pretty furred up with gunk.
Basically, do you think these meters are beyond salvation? (They better not
be, the cheapest ones I can buy are about $85!!)
Thanks,
Matt