Devices and methods are provided to facilitate the evaluation of the quality of a combinatorial library of compounds. One exemplary device comprises a holding plate having an array of apertures. A plurality of vials are removably held within the apertures. Each of the vials has an open top end. A seal member is disposed over the top ends of the vials, and a top plate is removably coupled to the holding plate to force the seal member against the top ends of the vials.
