Bulk air samples

In the first survey, head space and bulk air samples are taken to identify possible airborne compounds from the particular operation. For reaction chamber cleans, bulk air samples are taken inside the reaction chamber. Also, a residue sample is taken from the reaction chamber for subsequent head space analysis. For cold trap surveys, air samples are taken inside the trap and at the discharge port. In pump oil surveys, a sample of used oil is taken for a head space analysis and air samples are taken above the used oil as it is transferred. Used oil filters can be evaluated by placing them in a plastic bag, allowing them to off-gas, and then analyzing the head space ofthe bag. Air samples should also be taken near the old oil filter as it is removed. 

These samples are analyzed for certain compounds identified in previous surveys and for unknowns. Bulk air samples, coupled with Concentration Mass Spectroscopy (MS/MS), can be used for the detection and identification of volatile inorganics and organics. Unknown volatile organics can also be identifiedusing Tenax tubes with subsequent thermal desorption and Gas Chromatography/Mass Spectroscopy (GC/MS) analysis. 

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