How often should a round-robin test or standard control be carried out?

Document ID

Document ID TE10199

Published Date

Published Date 21/10/2019
Question
How often should a round-robin test or standard control be carried out?
Summary
Frequency of round-robin tests and standard controls
Answer
According to Factsheet ATV-DVWK M 704, published by the German Association for Water, Wastewater and Waste, it is recommended that standard measurements for each parameter are performed at least once per month or every 10th sample.
The minimum frequency for round-robin tests is once or twice per year. Both measurements should be carried out by a specific individual.

The case report "Recognised Results Based on Analytical Quality Assurance (AQA)" contains the AQA frequencies and quality targets (as well as other information).

The ADDISTA packs for various parameters contain both the standard solutions and the round-robin test solutions (A and B):