Method Description Sheet

Method EPA Method 524.1
Abstract Volatile organic compounds and surrogates with low water solubility are extracted (purged) from the sample matrix by bubbling an inert gas through the 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 the trapped sample components into a packed gas chromatography (GC) column interfaced to a mass spectrometer (MS). The column is temperature programmed to separate the method analytes which are then detected with the MS. Compounds eluting from the GC column are identified by comparing their measured mass spectra and retention times to reference spectra and retention times in a data base. Reference spectra and retention times for analytes are obtained by the measurement of calibration standards under the same conditions used for samples. The concentration of each identified component is measured by relating the MS response of the quantitation ion produced by that compound to the MS response of the quantitation ion produced by a compound that is used as an internal standard. Surrogate analytes, whose concentrations are known in every sample, are measured with the same internal standard calibration procedure.

Compounds Analyzed :

CAS #Compound Name
71432 Benzene
108861 Bromobenzene
74975 Bromochloromethane
75274 Bromodichloromethane
75252 Bromoform
74839 Bromomethane
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
75092 Methylene chloride
100425 Styrene
630206 1,1,1,2-Tetrachloroethane
79345 1,1,2,2-Tetrachloroethane
127184 Tetrachloroethene
108883 Toluene
71556 1,1,1-Trichloroethane
79005 1,1,2-Trichloroethane
79016 Trichloroethene
75694 Trichlorofluoromethane
96184 1,2,3-Trichloropropane
75014 Vinyl chloride
95476 o-Xylene
108383 m-Xylene
106423 p-Xylene
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