Evacuated refrigerant container as a source of vacuum for air sampling.

An air sampling system utilizing suitable collection media and a converted single-use evacuated Freon container as a source of vacuum is described. Such a system eliminates the explosion hazard of conventional samplers that use electrical pumps and motors. The pre-evacuated system is relatively light-weight, rugged, safe, inexpensive, and needs no electricity during sample collection. However, it is unwieldy to carry several containers for field collection of multiple samples, and the flow rate is not constant throughou the sampling time. (DCM)