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Abstract
Laboratory evaluation of a sampling system for quantification of specific volatile hazardous organics emitted from land treatment facilities is described. System evaluation was based on: 1) flux chamber interior pressure and mixing conditions as a function of chamber purge flow rate, 2) TenaxTM and charcoal sorbent tube and Tenax/chamber compound collection and recovery efficiency for seven volatile hazardous organics identified in petroleum refinery wastes (e.g., benzene, toluene, ethylbenzene, p-, m-, and o-xylene, and naphthalene), and 3) compound Tenax breakthrough volume as a function of temperature and mass of contaminant collected. Results indicated that Tenax was the solid sorbent material of choice due to its effectiveness for collection and recovery of all compounds of interest in the study. Tenax breakthrough volumes were shown to be a strong function of both temperature and collected mass levels. Purge flow rates less than 1 L/min were required to minimize interior chamber pressure, however, mixing results indicated that complete-mix behavior was exhibited within the chambers at flows as low as 0.73 L/min. It is recommended that a constant volume purge pump be incorporated into sampler design to minimize system pressure development, while providing optimal sample collection/concentration efficiency.