7900: What's causing my standards to split?

Are you running the full Start Up (Torch Axis, EM, Plasma Correction, Resolution/Axis, Standard Lens Tune, and Performance report)? You mentioned running an autotune, but it's also important to run the Start Up which optimizes hardware settings that the batch autotune does not. The batch autotune only optimizes the lenses for each tune mode. 

Also, typically we run the HMI-4 preset for most EPA sample matrices, this will have preset parameters for the RF Power, Sample Depth, Nebulizer and Dilution Gas Flows. The preset conditions are well vetted to provide the most robust conditions, so I recommend reverting back then reevaluating the drift issue. I would uncheck the box for all parameters and go back to the preset mode for HMI since right now you are running an odd mix of low matrix and HMI which will not yield the best stability. 

Also, how old are your cones?

What concentration internal standard are you using?

Can you confirm that your grounding T (also called the mixing T) is clamped in the peri pump?

Are you running the mineral elements as well (Ca, Na, Fe, K, etc)?

"Are you running the full Start Up (Torch Axis, EM, Plasma Correction, Resolution/Axis, Standard Lens Tune, and Performance report)?"

Yeah, I run all of that every morning

"Also, typically we run the HMI-4 preset for most EPA sample matrices, this will have preset parameters for the RF Power, Sample Depth, Nebulizer and Dilution Gas Flows. The preset conditions are well vetted to provide the most robust conditions, so I recommend reverting back then reevaluating the drift issue. I would uncheck the box for all parameters and go back to the preset mode for HMI since right now you are running an odd mix of low matrix and HMI which will not yield the best stability."

Ok, I'll try that

"Also, how old are your cones?"

About a week

"What concentration internal standard are you using?"

2 mg/L

"Can you confirm that your grounding T (also called the mixing T) is clamped in the peri pump?"

I don't have one

"Are you running the mineral elements as well (Ca, Na, Fe, K, etc)?"

Yes

"Are you running the full Start Up (Torch Axis, EM, Plasma Correction, Resolution/Axis, Standard Lens Tune, and Performance report)?"

Yeah, I run all of that every morning

"Also, typically we run the HMI-4 preset for most EPA sample matrices, this will have preset parameters for the RF Power, Sample Depth, Nebulizer and Dilution Gas Flows. The preset conditions are well vetted to provide the most robust conditions, so I recommend reverting back then reevaluating the drift issue. I would uncheck the box for all parameters and go back to the preset mode for HMI since right now you are running an odd mix of low matrix and HMI which will not yield the best stability."

Ok, I'll try that

"Also, how old are your cones?"

About a week

"What concentration internal standard are you using?"

2 mg/L

"Can you confirm that your grounding T (also called the mixing T) is clamped in the peri pump?"

I don't have one

"Are you running the mineral elements as well (Ca, Na, Fe, K, etc)?"

Yes