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 :

CAS #Compound Name
71432 Benzene
108861 Bromobenzene
74975 Bromochloromethane
75274 Bromodictiloromethane
75252 Bromoform
74839 Bromomethane
104518 n-Butylbenzene
135988 sec-Butylbenzene
98066 tert-Butylbenzene
56235 Carbon tetrachloride
108907 Chlorobenzene
75003 Chloroethane
67663 Chloroform
74873 Chloromethane
95498 2-Chlorotoluene
106434 4-Chlorotoluene
124481 Dibromochloromethane
96128 1,2-Dibromo-3-chloropropane
106934 1,2-Dibromoethane
74953 Dibromomethane
95501 1,2-Dichlorobenzene
541731 1,3-Dichlorobenzene
106467 1,4-Dichlorobenzene
75718 Dichlorodifluoromethane
75343 1,1-.Dichloroethane
107062 1,2-Dichloroethane
75354 1,1-Dichloroethene
156592 cis-1,2-Dichloroethene
156605 trans-1,2-Dichloroethene
78875 1,2-Dichloropropane
142289 1,3-Dichloropropane
594207 2,2-Dichloropropane
563586 1,1-Dichloropropene
10061015 cis-1,3-Dichloropropene
10061026 trans-1,3-Dichloropropene
100414 Ethylbenzene
87683 Hexachlorobutadiene
98828 Isopropylbenzene
99876 4-Isopropyltoluene
75092 Methylene chloride
91203 Naphthalene
103651 Propylbenzene
100425 Styrene
630206 1,1,1,2-Tetrachloroethane
79345 1,1,2,2-Tetrachloroethane
127184 Tetrachloroethene
108883 Toluene
87616 1,2,3-Trichlorobenzene
120821 1,2,4-Trichlorobenzene
71556 I,I,I-Trichloroethane
79005 1,1,2-Trichloroethane
79016 Trichloroethene
75694 Trichlorofluoromethane
96184 1,2,3-Trichloropropane
95636 1,2,4-Trimethylbenzene
108678 1,3,5-Trimethylbenzene
75014 Vinyl chloride
95476 o-Xylene
108383 m-Xylene
106423 p-Xylene
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