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Qtof contaminants at m/z 200 and 270

Question asked by joonseok on Jun 11, 2020
Latest reply on Jun 11, 2020 by joonseok



We are using three Agilent Qtof's (6550) and all shows annoying, significant contaminants and the nuisances are usually started to be detected after a gradient hits 50%MeCN until the end. Their m/z values are ~200.2386 and 270.3172 as shown below. Is there any group who has experienced to resolve such an issue? Where are they coming from?

Thank you and be safe!