An automated sample collection workstation comprises a motor actuated sealing assembly having upper (23) and lower (25) clamping plates and fixtures to which particle-containing components of a particle testing unit such as an inertial impactor are mounted. The workstation also includes a sampling module (SM) including a plurality of sampling needles (SN) movable along two axes, and a solvent flow-through system. The solvent flow-through system includes a pump and multi-position valve arrangement communicating with the sealing assembly and the sampling module. The workstation can also include a pump calibration system communicating with the solvent flow-through system.
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