Is there a way of testing the strength of 10% formalin?
At our hospital laboratory the staff have been making up 10% formal saline
for 40 years. An odd time one would come across a dud bottle of 38-40%
formaldehyde and discard.
Recently however there has been a lot of dud bottles and I'm wondering is
it the unseasonally cold spell of weather. The temperature in the Chemical
store in the yard may have dropped well below (-7min.) the recommended
10-25C some nights and I'm wondering would this result in weak formalin.
There also is an uncharacteristic clear red tinge to blood stained
specimens as if it had a higher than usual alcohol content. (We decided
not to change over to NBF years ago as it works fine for most Immunos. We
are in the UKNeqas ICC and doing OK.
I thought even if the temp. dropped below 10C and subsequently was brought
up to room temperature and diluted to make 10% formal saline then it would
be fine. Does anyone have any experience of this kind of thing???
Any thoughts ?? I have asked the supplier for a "certificate of
conformity" for this batch and the date of manufacture and it is pending.
There is a use by date on it of Oct 2001. Is there a way of testing the
strength of the formaldehyde or would a low pH indicate a deteriorating
Medical Laboratory Technologist
Our Lady of Lourdes Hospital
<< Previous Message | Next Message >>