Discussion
The technique that reduces mercury to the element and sweeps it into a cell without a flame is ______ vapour atomic absorption.
Answer: C
This is cold vapour, so named because no flame or furnace is needed - mercury alone has enough vapour pressure at room temperature. Hydride generation serves arsenic and its relatives, and a plasma is an emission source. A technique built around one element's unique physical property will only ever serve that element, which is why it has its own name rather than being a variant of the general method. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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