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Thermo Fisher Scientific

Pseudo-Saturation in iTEVA


Peaks appear broken



  • iCAP 6000 series
  • iCAP 7000 series
  • iTEVA


  1. In Figure 1 we refer to this as a pseudo-saturation.   With the subarray popup window open for the wavelength which is exhibiting a pseudo-saturation, increase the ‘C’ pixels to include the area under the peak (see Figure Note: occasionally you might have to increase the subarray width  greater than the default of 12 and turn off a Left or Right background correction point. In Figure 2, the Right background correction points had to be disabled due to it touching the center pixels after they were widened to 4 pixels.

FIGURE 1                                                                                                                FIGURE 2

2. Click on “Update Method” to save these changes.

3. Aspirate a solution containing the element pertaining to the wavelength exhibiting pseudo-saturation and perform an Autopeak Adjust (If you are unsure of how to do this, please reference the Tech Note entitled “Autopeak Adjust” for instructions on how to do so)

3. Using the same solution used to perform the autopeak adjust, run one repeat of an Unknown and then double click on the wavelength exhibiting pseudo-saturation in order to open up the subarray window

4. Optimize the number of center pixels and center pixel placement see Figure 3

    Figure 3: Center pixels have been optimized

5. Click on “Update Method” to save changes

6. Repeat steps 1-6 for any other wavelengths which are also exhibiting pseudo-saturation.

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