Kromatografisystemets stabilitet kontrolleres, ved at der flere gange indsprøjtes kalibreringsopløsning (3.7.3) med 1,0 μg/ml, indtil der opnås konstante tophøjder og retentionstider.
Check the stability of the chromatographic system, injecting several times the calibration solution (3.7.3) containing 1,0 μg/ml, until constant peak heights and retention times are achieved.