Measurement and Results - Acceptance limits for water QC standards

We have recently purchased QCP-DMD have some questions regarding the certified values and the acceptance limits stated on the Certificate of Analysis. The certified value for the BOD is 154 ±3 and the acceptance limits are 109-199, Can you please explain why the acceptance limits so wide (30%)? We have checked the standard via the COD value and are getting figures at nearly the nominal value so the standard seems ok.. we would just would like to have an explanation of the acceptance limits.
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Brian Alexander, PhD Total posts: 16

Great question! The acceptance limits are calculated using data and equations provided by the NELAC Institute Fields of Proficiency Testing tables (, and specifically the non-potable water for chemistry and microbiology data tables.

Posted: 11/12/19 14:47:11

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