Abstract
Freeze-drying equipment at this station capable of handling bulk quantities of fresh plant material was designed as a single unit and was therefore unsatisfactory for use with plant materials having insecticide residues because decontamination was difficult and quantitative recovery of the condensate after each run was almost impossible. The condensate may contain a considerable portion of the insecticide and contamination could influence assay results. To overcome these problems a simple apparatus, modified after the Cole-Palmer bulk freeze-dryer (Cole-Palmer Instrument and Equipment Company, Chicago, Illinois), was constructed from readily available materials with a minimum of machine-shop labor.
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