Discussion
What is ion suppression in a mass spectrometric detector?
Answer: B
Something eluting with the analyte competes for charge in the electrospray droplet, so the analyte's signal falls without any change in the amount present. Mass filtering, flow limits and charge loss are separate matters. Because the suppression varies between samples of different matrix, an isotopically labelled internal standard is the only reliable correction - which is why such standards dominate quantitative work. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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