Discussion
Which of the following is not the advantage of reciprocating pump used in UHPLC ?
Answer: B
Small solvent capacities is not an advantage of the reciprocating pump.
Reciprocating pumps are the standard pumps of HPLC and UHPLC. The advantages usually listed for them are a small internal volume, high output pressure, ready adaptability to gradient elution and a constant flow rate. Their main drawback is a pulsed flow, which needs a pulse damper.
A small solvent capacity describes the displacement or syringe pump, whose limited reservoir has to be refilled. The other three options are the textbook advantages of the reciprocating design, so they are not the answer.
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