Using a Certified Reference Material (CRM) beyond its expiration date can introduce certain risks. The degree of these risks hinges on various factors, including the type of material, the conditions it's been stored in, and how it's been handled. Some CRMs remain stable even past their expiration dates, while others could start to degrade, leading to potential inaccuracies in results.
As a general guideline, using a CRM beyond its expiration date is not recommended when you're aiming for precise results. It's crucial to follow the manufacturer's instructions for storage and handling to ensure the CRM's performance and accuracy. That said, it’s clear there are entrenched misunderstandings surrounding expiry dates. This confusion can lead to misconceptions that, if not corrected, can impact the accuracy of measuring systems and compromise the integrity of scientific research. Let's debunk five common misconceptions about CRM expiry dates.
Misconception 1: Expiration Date and Shelf Life Are the Same
One of the most common misconceptions is that a certified reference material's expiration date and shelf life are the same. These two terms refer to different aspects of a standard's usability. The shelf life refers to when a properly packaged and stored standard remains chemically and physically stable. On the other hand, the expiration date is the recommended period a standard should remain in use in a laboratory setting after it has been opened.
Misconception 2: Expiration Dates Can Be Extended
Another common misconception is that the expiration date of a standard can be extended. This is not the case. The expiration date is determined based on rigorous testing and adherence to ISO Guide 34 and ISO/IEC 17025 guidelines. Extending the expiration date without proper scientific justification can compromise the reliability of the standard and the accuracy of the results obtained using it.
Misconception 3: All Standards Have the Same Expiry Date
It's a common misconception that all standards have the same expiry date. In reality, the expiration date of a standard is dependent on several factors, including its chemical stability, transpiration losses, and the "human factor" associated with its use. Therefore, different standards can have different expiry dates.
Misconception 4: Standards Remain Homogeneous and Stable After Expiry
Some believe that standards remain homogeneous and stable even after their expiry date. This is not true. After the expiration date, the risk of contamination increases, and the standard may no longer remain within the certified reference material’s range. This can lead to inaccurate results and potential issues with regulatory compliance.
Misconception 5: Expiration Dates Are Arbitrary
The final misconception is that expiration dates are arbitrary. This is far from the truth. Expiration dates are determined based on rigorous scientific research and testing. They are designed to ensure the standard's reliability and accuracy and minimize the risk of errors in analytical results.
Understanding the true meaning and significance of the expiration date of standard reference materials is crucial for maintaining the integrity of scientific research and ensuring accurate results. But the journey doesn't stop here. To delve deeper into the world of analytical standards, we invite you to explore our detailed article on the difference between certified reference materials and reference standards. Expand your knowledge and ensure your results are reliable and repeatable with the right choice of materials. At Inorganic Ventures, we're committed to providing reliable, high-quality standards. Contact us today to enhance your quality control with the right choice of certified reference materials.