Method 624

Purgeable Organics by GC/MS


This is a purge and trap gas chromatographic/mass spectrometer (GC/MS) method applicable to the determination of various purgeable organics in municipal and industrial discharges as provided under 40 CFR Part 136.1. An inert gas is bubbled through a 5 mL water sample contained in a specially-designed purging chamber at ambient temperature. The purgeables are efficiently transferred from the aqueous phase to the vapor phase. The vapor is swept through a sorbent trap where the purgeables are trapped. After purging is completed, the trap is heated and backflushed with the inert gas to desorb the purgeables onto a gas chromatographic column. The gas chromatograph is temperature programmed to separate the purgeables which are then detected with a mass spectrometer.


(EPA: Office of Water)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   14 days from sample collection to analysis
Preservatives:   Samples must be iced or refrigerated from sampling to analysis; if residual chlorine is present, add 10 mg/40 mL of sodium thiosulfate; adjust to pH < 2 with HCl if benzene, toluene, or ethyl benzene is to be determined
Required Preps:   Vial—25 mL capacity or larger, equipped with a screw cap with a hole in the center.
Collection Method:   Collect in glass container with volume of at least 26mL; fill bottle just to overflowing so that no air bubbles pass through; seal bottle so that no air bubbles are entrapped; if preservative has been added, shake vigorously; maintain seal until analysis
Analytical Methodology:   GC/MS
Documentation:   624

Analyte List*

Analyte Formula CAS Number Detection Limit
Ethylbenzene
C8H10
100-41-4
7.2
 µg/L
cis-1,3-Dichloropropene
C3H4Cl2
10061-01-5
5
 µg/L
trans-1,3-Dichloropropene
C3H4Cl2
10061-02-6
 
1,4-Dichlorobenzene
C6H4Cl2
106-46-7
 
1,2-Dichloroethane
C2H4Cl2
107-06-2
2.8
 µg/L
Toluene
C7H8
108-88-3
6
 µg/L
Chlorobenzene
C6H5Cl
108-90-7
6
 µg/L
Ethyl Vinyl Ether
C4H7ClO
110-75-8
 
Chlorodibromomethane
CHBr2Cl
124-48-1
3.1
 µg/L
Tetrachloroethene
C2Cl4
127-18-4
4.1
 µg/L
trans-1,2-Dichloroethene
C2H2Cl2
156-60-5
1.6
 µg/L
1,3-Dichlorobenzene
C6H4Cl2
541-73-1
 
Carbon tetrachloride
CCl4
56-23-5
2.8
 µg/L
Chloroform
CHCl3
67-66-3
1.6
 µg/L
Benzene
C6H6
71-43-2
4.4
 µg/L
1,1,1-Trichloroethane
C2H3Cl3
71-55-6
3.8
 µg/L
Bromomethane
CH3Br
74-83-9
 
Chloromethane (Methyl chloride)
CH3Cl
74-87-3
 
Chloroethane
C2H5Cl
75-00-3
 
Vinyl chloride
C2H3Cl
75-01-4
 
Methylene chloride
CH2Cl2
75-09-2
2.8
 µg/L
Bromoform
CHBr3
75-25-2
4.7
 µg/L
Bromodichloromethane
CHBrCl2
75-27-4
2.2
 µg/L
1,1-Dichloroethane
C2H4Cl2
75-34-3
4.7
 µg/L
1,1-Dichloroethene
C2H2Cl2
75-35-4
2.8
 µg/L
Trichlorofluoromethane
CCl3F
75-69-4
 
1,2-Dichloropropane
C3H6Cl2
78-87-5
6
 µg/L
1,1,2-Trichloroethane
C2H3Cl3
79-00-5
5
 µg/L
Trichloroethene
C2HCl3
79-01-6
1.9
 µg/L
1,1,2,2-Tetrachloroethane
C2H2Cl4
79-34-5
6.9
 µg/L
1,2-Dichlorobenzene
C6H4Cl2
95-50-1
 

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.