Expiration dating for laboratory reagents and solutions
This article provides you, the consumer, with the best definitions for shelf life and expiration date.This information will help you make the correct decisions when other suppliers throw misleading comments into the mix.The integrity of an aqueous trace metals standard is dependent upon: is the amount of time that a properly packaged and stored standard will last without undergoing chemical or physical changes, remaining within the specified uncertainty.A change greater than that uncertainty (±0.5% relative for our standards) means the standard has gone over (passed) its shelf life. I am wondering how to establish the expired date for the test reagents (using for identification, test) that the expired date is not specified is pharmacopoeia. Very simple, usually we give 2 months expiry for reagents for identifiation tests. Evaluation : Examine a test sample by using freshly prepared solution and a solution prepared two months before.
In some cases you can also find information about alternative columns.This decision is made based on the stability of the solution, its intended use and storage conditions.If this information is not stated in the text in a USP monograph for the particular volumetric solution, then it is up to your lab to define this frequency.Inorganic Ventures manufactures single-element standards to be chemically stable .Our chemists have been checking and testing standards for almost 20 years.