Stack Gas Samples Collected by Method 0011 (Procedure 1): The entire sample
returned to the laboratory is extracted with methylene chloride and the extract is diluted or
concentrated to a known volume. An aliquot of the methylene chloride extract is solvent exchanged
CD-ROM 8315A - 3 Revision 1
December 1996
and concentrated or diluted as necessary. HPLC conditions are described that permit the separation
and measurement of various carbonyl compounds in the extract by absorbance detection at 360 nm.
2.3 Indoor Air Samples by Method 0100 (Procedure 2): The sample cartridges are returned
to the laboratory and backflushed with acetonitrile into a 5-mL volumetric flask. The eluate is diluted
to volume with acetonitrile. Two aliquots of the acetonitrile extract are pipetted into two sample vials
having polytetrafluoroethylene (PTFE)-lined septa. HPLC conditions are described which allow for
the separation and measurement of the various carbonyl compounds in the extract by absorbance
detection at 360 nm.