For regular verification of all methods used in the laboratory next to calibration the use of quality check (QC) material has proven to be an effective measure. QC materials can be handled like every regular sample and thus are easy to use. AGQM has successfully distributed QC material for the determination of the oxidation stability (OS) already since November 2011. QC material MeOH (methanol content) and a multi-reference standard (MR), which is a reference for a number kb umlrnivxtv zi DM 50375, xvw dfgg ykyucrqqi.
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