storage of standards...what temp?
Posted 17 February 2010 - 12:18 AM
so i ordered some tnf-a standards several months ago. i had anticipated using them pretty soon (about 4 weeks later) but due to some circumstances i postponed my experiment to...3 months later. here's the thing: my facility only has a -20 C freezer, and i had been keeping them there even though they are recommended to be stored at -80 C . when i asked the tech support at the company, they said it would be fine for 4 weeks. when asked about 3 months, they said they didn't know but would guess it would be okay.
do you think the standards are unable to be used now? should i purchase new ones to be safe (an extra $300) or so or just go with these?
Posted 17 February 2010 - 07:17 AM
if they aren't too expensive and/or irreplaceable then try the standard with them.
you can purchase new standard and run it along side the questionable one.
genius does what it must
i do what i get paid to do
Posted 17 February 2010 - 11:43 AM
Posted 31 May 2010 - 04:51 PM