Setting AVS 7 for trace element analysis

Hello, i'm working on developing methode of chromium in milk powder by ICP-OES 5110, i used to set up the AVS 7 as attached on pic and it have been having bad replicates, it's always on 3rd replicates meanwhile on 1st and 2nd replicates is fine. Anyone had this issue, I've already try another setting for avs but nothing changed. Can you give me some recomendation for this issue?

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