Discussion
Why is the fuel-to-oxidant ratio adjusted for some elements?
Answer: A
Excess fuel creates a reducing environment that discourages oxide formation, which helps elements such as chromium and molybdenum that would otherwise be tied up. A lean flame is hotter and better for some elements but not all, and neither height nor uptake is set by the ratio. Tuning the flame's chemistry as well as its temperature is part of optimising a method, and the best ratio differs from element to element. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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