Method Description Sheet

Method EPA Method 503.1
Title VOLATILE AROMATIC AND UNSATURATED ORGANIC COMPOUNDS INWATERBY PURGE AND TRAP GAS CHROMATOGRAPHY
Abstract Highly volatile organic compounds with low water solubility are extracted (purged) from a 5-mL sample by bubbling an inert gas through the aqueous sample. Purged sample components are trapped in a tube containing a suitable sorbent material. When purging is complete, the sorbent tube is heated and backflushed with an inert gas to desorb trapped sample components onto a gas chromatography (GC) column. The gas chromatograph is temperature programmed to separate the method analytes which are then detected with a photoionization detector. A second chromatographic column is described that can be used to help confirm GC identifications or resolve coeluting compounds. Analyses may be performed by gas chromatography/mass spectrometry (GC/MS) according to Method 524.1 or Method 524.2.

Compounds Analyzed :

CAS #Compound Name
71432 Benzene
108861 Bromobenzene
104518 n-Butylbenzene
135988 sec-Butylbenzene
98066 tert-Butylbenzene
108907 Chlorobenzene
95498 2-Chlorotoluene
106434 4-Chlorotoluene
95501 1,2-Dichlorobenzene
541731 1,3-Dichlorobenzene
106467 1,4-Dichlorobenzene
100414 Ethylbenzene
87683 Hexachlorobutadiene
98828 Isopropylbenzene
99876 4-Isopropyltoluene
91203 Naphthalene
103651 n-Propylbenzene
100425 Styrene
127184 Tetrachloroethene
108883 Toluene
87616 1,2,3-Trichlorobenzene
120821 1,2,4-Trichlorobenzene
79016 Trichloroethene
95636 1,2,4-Trimethylbenzene
108678 1,3,5-Trimethylbenzene
95476 o-Xylene
108383 m-Xylene
106423 p-Xylene
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