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High RSD in AutoTune

joemagal

Hello,

I have been having issues with a high RSD% (>5%) when AutoTuning. The ICP-MS 7700 has recently had maintenance done including: cleaning/soaking nebulizer, spray chamber, torch in 5% HNO3, cleaning extraction lens-omega lens, and changing out sample and skimmer cones for new ones, as well as replacing peri-pump tubing. Nebulizer test and Shortage test all passed and looked good. All solutions have been re-prepped fresh recently including ISTD solution, probe rinse solution, and tuning solution. I have been having to adjust the peri-pump clamp tension and He flow to get the RSD% low enough to pass. Is there something I am missing that has to be done to lower the RSD%? Included are 3 AutoTune attempts done within the same hour.

   

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  • 0

    Like carwogill says, counts are low. 800 is low for a tunning, so you would expect a high RSD. which solutions are you using?

    Seems you tried a lot of things, did this results appear from one day to the other?

    I also use the nebulizer gas in 0,9-1 L/min and sample depth in 7~8. It increases oxides but also takes more counts. Also the He flow seems really high.

    But maybe your measurements need those configurations.

  • 0 in reply to lisandrom91

    Hello,

    I use a 10 ppb Li, Y, Co, Ce, Tl, Mg tuning solution.

    The issue slowly started to arise over a couple months but now it has gotten to the point where the RSD is >5%.

    And the parameters were set by the previous analyst, I was recently hired to take over so I'm just working with what they had set before. According to my SOP I am able to lower the He flow down to 4.5 ml/min (minimum) and 5.5 ml/min (maximum).

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  • 0 in reply to lisandrom91

    Hello,

    I use a 10 ppb Li, Y, Co, Ce, Tl, Mg tuning solution.

    The issue slowly started to arise over a couple months but now it has gotten to the point where the RSD is >5%.

    And the parameters were set by the previous analyst, I was recently hired to take over so I'm just working with what they had set before. According to my SOP I am able to lower the He flow down to 4.5 ml/min (minimum) and 5.5 ml/min (maximum).

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