Expiration dates and not only confusing but very variable and inaccurate. I do
not think you should worry about how the vendor determined the exp. date→maybe
it is just greater than a competitor's just to "lure" you to buy theirs, who
knows, but you can use their exp.date for yours.HCl absorbs water vapor if the
container is not well capped, and that may be the "over-reacting"
recommendation of testing is in 5 years, but it could be 4 years or 10 years
depending in the environment humidity or the cap used.These regulations are
something like the "piggy banks", they make "parents bank robbers" and the
exp.dates "make histotechs liers".With experience you will be able to determine
that some solutions "weaken" after some time lapse, use those known lapses as
your exp.date for those solutions and "expand" to others.The inspectors, in
their "infinite wisdom" want to read a date, regarldess of its accuracy. Their
"ego" is saved by a written date.René J.
On Wednesday, December 10, 2014 11:46 AM, "Bitting, Angela K."
<akbitt...@geisinger.edu> wrote:
We are being inspected soon and I'm trying to check the labels on all of my
chemicals. How do I determine the expiration date of a 1N HCl solution I
prepared in house. I went on line and a commercially available 1N HCl solution
has a 36 month shelf life according to the vendor's web site. I don't know how
they arrived at that. I know concentrated HCl has an indefinite shelf life, but
a 5 year retest date appears on the COA. It's confusing to me.
Any help would be appreciated.
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