Aerobiological Studies ； Sonic-Speed, Liquid Impinger for Collecting Samples of Micro-Biological Materials from Aerosols

摘要

A sonic-spued, liquid impinger used by the Aerobiology Branch in collecting samples of particulate matter (containing such materials as bacteria, by® tracers, toxins, and viruses) from aerosols is described.nThe diameter of the capillary tube or orifice is such that the maximum flow, or the flow at which the velocity of air through the orifice is the same as that of sound, in the desired sampling rate. Twenty-five ml. of a liquid suitable for hold¬ing the particulate matter to be sampled lo used in the impinger.nThe portion of the collected material retained in the intake tube during the usual quantitatlag procedure was found to be too small to Justify a opecial removal procedure.