7.5.1 Technical Records: The laboratory shall ensure that technical records for each laboratory activity contain the results, report and sufficient information to facilitate, if possible, identification of factors affecting the measurement result and its associated measurement uncertainty and enable the repetition of the laboratory activity under conditions as close as possible to the original:
d) Column lot number
Question: Does this refer to analytical LC/GC columns or preparation (clean up) columns, such as SPE cartridges? Some LC columns do not come with a lot number, but a serial number is. Is that appropriate to meet this requirement?
Answer: Since analytical columns contribute to the measurement uncertainty of the method, it is necessary to record that information. In cases where a lot number is not provided a serial number still provides a record of that unique item. Regarding clean up columns, traceability is still necessary. This can be helpful in laboratories when a lot of cartridges are underperforming or contaminated.
