Discussion
What is cold vapour atomic absorption used for?
Answer: D
Mercury is the only metal with an appreciable vapour pressure at room temperature, so reducing it to the element and sweeping it into a cell needs no flame at all. Arsenic and selenium use the related hydride generation technique, refractory elements need the hot flame, and alkali metals atomise easily. A technique built around one element's unique property will only ever serve that element. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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