Simple Multisample Solvent Evaporation Assembly

The design, construction and performance of an inexpensive multisample solvent evaporator assembled from readily available parts is described. Tubes containing solvent are heated in aluminum blocks under inert gas flow from a gas-divider manifold. The efficiency and uniformity of evaporation is satisfactory, and no substantial amounts of contaminants were observed in 100-fold solvent concentrates by gas chromatography with FID, FPD, and ECD detection. The assembly provides for an easy introduction of adsorbent trapping materials in the gas stream to remove any contaminants present in the gas.