As you are aware of, the ISO/IEC 17025:2017 Clause 7.6.1 states that “(Accredited) laboratories shall identify the contributions to measurement uncertainty. When evaluating measurement uncertainty, all contributions that are of significance, including those arising from sampling, shall be taken into account using appropriate methods of analysis.”
If your laboratory is involved routinely in site sampling followed by laboratory analysis for
– environmental baseline studies,
– contaminated site surveys,
– production QC checks / issuing Certificates of Quality, and/or,
– swimming pool water/potable water tank / trade effluent discharge,
you are then expected to evaluate your measurement uncertainty covering both sampling and analytical uncertainties.
Sub-sampling of the laboratory sample received for analysis however, does not require the evaluation of sampling uncertainty as it is considered to be part of your testing procedure.
However, you have to ensure the test sample taken for analysis is representative of the laboratory sample received. So, you shall have a sub-sampling method in your SOP.
If you or your colleagues are interested in this subject, you are most welcome to register the interest with us for this 1.5-hour free Webinar to be conducted on Wednesday 17 March at 8.00pm (Singapore time) virtually via Zoom. Our email is email@example.com. A Zoom Invite Link will be provided to the registered participants in return.
Let’s study applied statistics together!
Zoom limits the number of participants at 100. Do register early!