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What is a monolithic column?

  • A.A column packed with unusually large particles
  • B.A column with two stationary phases in series
  • C.A column made entirely of stainless steel
  • D.A single porous rod rather than packed particles

Answer: D

A monolith is one continuous piece of porous silica or polymer with large flow-through channels and fine pores for retention, so the eluent passes readily while the surface area stays high. It contains no particles, no second phase and is not defined by its casing. Separating the flow path from the retentive surface is what lets a monolith run at high flow with modest pressure.

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