Method Description Sheet

Method EPA Method 502.2
Title VOLATILE ORGANIC COMPOUNDS IN WATER BY PURGE AND TRAPCAPILLARY COLUMN GAS CHROMATOGRAPHY WITH PHOTOIONIZATION ANDELECTROLYTIC CONDUCTIVITY DETECTORS IN SERIES
Abstract Highly volatile organic compounds with low water solubility are extracted (purged) from the sample matrix by bubbling an inert gas through a 5 mL aqueous sample. Purged sample components are trapped in a tube containing suitable sorbent materials. When purging is complete, the sorbent tube is heated and backflushed with helium to desorb trapped sample components onto a capillary gas chromatography (GC) column. The column is temperature programmed to separate the method analytes which are then detected with a photoionization detector (PID) and a halogen specific detector placed in series. Tentative identifications are confirmed by analyzing standards under the same conditions used for samples and comparing resultant GC retention times. Additional confirmatory information can be gained by comparing the relative response from the two detectors. Each identified component is measured by relating the response produced for that compound to the response produced by a compound that is used as an internal standard. Absolute confirmation, a gas chromatography/mass spectrometry(GC/MS) determination according to method 524.1 or method 524.2 is recommended.

Compounds Analyzed :

Selecting a CAS number from the table below will direct you to the
National Library of Medicine's Hazardous Substances Database for more details on the compound.

CAS #Compound Name
71-43-2Benzene
108-86-1 Bromobenzene
74-97-5 Bromochloromethane
75-27-4 Bromodictiloromethane
75-25-2 Bromoform
74-83-9Bromomethane
104-51-8n-Butylbenzene
135-98-8sec-Butylbenzene
98-06-6tert-Butylbenzene
56-23-5 Carbon tetrachloride
108-90-7Chlorobenzene
75-00-3 Chloroethane
67-66-3Chloroform
74-87-3Chloromethane
95-49-82-Chlorotoluene
106-43-44-Chlorotoluene
124-48-1Dibromochloromethane
96-12-8 1,2-Dibromo-3-chloropropane
106-93-4 1,2-Dibromoethane
74-95-3 Dibromomethane
95-50-1 1,2-Dichlorobenzene
541-73-1 1,3-Dichlorobenzene
106-46-71,4-Dichlorobenzene
75-71-8 Dichlorodifluoromethane
75-34-31,1-Dichloroethane
107-06-21,2-Dichloroethane
75-35-4 1,1-Dichloroethene
156-59-2cis-1,2-Dichloroethene
156-60-5trans-1,2-Dichloroethene
78-87-5 1,2-Dichloropropane
142-28-91,3-Dichloropropane
594-20-72,2-Dichloropropane
563-58-61,1-Dichloropropene
10061-01-5cis-1,3-Dichloropropene
10061-02-6trans-1,3-Dichloropropene
100-41-4 Ethylbenzene
87-68-3 Hexachlorobutadiene
98-82-8Isopropylbenzene
99-87-64-Isopropyltoluene
75-09-2Methylene chloride
91-20-3Naphthalene
103-65-1 Propylbenzene
100-42-5Styrene
630-20-61,1,1,2-Tetrachloroethane
79-34-5 1,1,2,2-Tetrachloroethane
127-18-4Tetrachloroethene
108-88-3Toluene
87-61-6 1,2,3-Trichlorobenzene
120-82-11,2,4-Trichlorobenzene
71-55-6 1,1,1-Trichloroethane
79-00-51,1,2-Trichloroethane
79-01-6Trichloroethene
75-69-4Trichlorofluoromethane
96-18-41,2,3-Trichloropropane
95-63-61,2,4-Trimethylbenzene
108-67-81,3,5-Trimethylbenzene
75-01-4 Vinyl chloride
95-47-6o-Xylene
108-38-3m-Xylene
106-42-3p-Xylene
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