Understanding Reference Standard Expiration

0:03
Understanding Reference Standard Expiration
0:07
Based on over 30 years of stability data
0:10
and extensive knowledge of chemical behavior
0:12
AccuStandard's analytical chemists assign an expiration period
0:16
ranging from three months to ten years
0:19
Certain chemicals, due to their nature,
0:21
are more likely to degrade than others
0:25
Conditions that may cause degradation include:
0:28
time, temperature, solvent, air, light, pH, and other analytes present
0:35
Our on-going stability program is constantly retesting standards
0:40
to see if the expiration period can be extended
0:42
If you have an unopened, expired standard contact us
0:46
to see if the expiration date of your AccuStandard product
0:49
can be extended
0:51
Some formulations are inherently unstable
0:54
so some products have a short expiration period to reflect
0:58
their anticipated usable shelf life
1:01
For example, our Method 8260 Additions Standard
1:04
has a four-month shelf life
1:06
Here is what a good chromatogram looks like for this standard
1:10
and here is a chromatogram of the same product several months later after improper storage
1:16
The integrity of the standard is affected and ketals have formed
1:20
due to both improper storage and time
1:23
As an every day example leaving milk out on your
1:26
kitchen counter will cause it to prematurely expire
1:29
before the provided expiration date
1:31
Milk must be sealed and refrigerated for the expiration date to remain valid
1:36
the same principle applies to properly storing your standards
1:40
proper storage of your standard is essential to ensure the optimal stability of the analytes
1:47
some products are shipped in a cold pack to delay their exposure to higher temperatures
1:53
AccuStandard states the storage conditions on the label
1:56
and the certificate of analysis
1:59
For more information, visit our website at www.accustandard.com
2:05
or you can reach technical service by emailing techservice@accustandard.com