Questions and suggestions are always important to us:
In order to be able to complete the proficiency test rounds in a foreseeable period of time, we ask you to observe the deadline in case of an objection or a complaint. It ends six weeks after the closing date. The dates for the respective round can be found in the detailed programme for the parameters.
Concerning natural water samples please inform yourself about the applicable objection periods at the Federal Environment Agency (UBA).
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