The standard product has expired, what about the laboratory staff?
What else can an expired standard be used for? If the standard product has expired, can it be used as waste? It should not be possible to continue to use it as a standard product, and it would be a pity to throw it away directly. It is all silver.
Some netizens said that it is completely possible to do qualitative analysis and rapid screening of pesticides. For example, for pesticide metabolism research, general analysis can also be used if it does not require too accurate quantification.
In fact, the laboratories that make residues have more or less expired standards, mainly because it is difficult to use them all within the shelf life.
Some seniors even took itexpired standardAfter conducting comparative experiments, the data show that if the standard is properly preserved, its use will not be affected after the expiration date, and even the quantitative accuracy will not be affected at all after one year of expiration.
In general, if the standard product has expired, we can use these methods.
1. Treat waste as liquid or solid waste in a unified manner for internal quality control.
2, the expired standard sample for a check, with the newly purchased standard liquid to quantify (please pay attention to cost considerations), refer to the physical and chemical properties of the standard product, as long as the change is not big, can be used as a collection rate test.
3. It can be used for the study of the change law of standards, and for the peak characterization of chromatographic analysis under the premise that the response of its degradation products is extremely weak.
4. It can be used for internal quality control, as a blind sample for data comparison, for qualitative analysis and rapid screening of pesticides, and for exploring experimental conditions in the laboratory to optimize parameters.
Here, the National Standard Products Network still has to say that some of the above tips are for waste utilization due to laboratory cost considerations. For regular CNAS-certified laboratories, they can only follow regulations and replace them when they expire. This obvious management loophole cannot exist.
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