Discussion
Why does a plasma suffer fewer chemical interferences than a flame?
Answer: A
At around seven thousand kelvin no compound survives, so the refractory oxide problems that plague flame work simply do not arise. Oxygen from the sample itself is present, residence time is comparable, and the use of argon is why the temperature is achievable rather than the reason interferences are absent. Removing a whole class of interference by exceeding the conditions that create it is the plasma's fundamental advantage. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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