Method 625

Base/Neutral and Acid Organics by GC/MS


This method is for the determination for base/neutral and acid compounds also known as semi-volatile organic compounds (SVOC's)  that from municipal and industrial wastewater.  One Liter of sample is serially extracted with methylene chloride at a pH > 11 and again at a pH < 2 using a separatory funnel or a continuous extractor.  The methylene chloride extract is dried, concentrated to a volume of 1 mL, and analyzed by gas chromatography/mass spectrometry (GC/MS).  

The base/neutral extraction may cause significant reduced recoveries of phenol, 2-methylphenol and 2,4-dimethylphenol.  Results for these compounds should be considered minimum concentrations.


(EPA: Office of Water)

Request-A-Quote

No Obligation Quotation for Analytical Services

If you would like us to provide a quote for laboratory analysis, just provide us with as much information as you can about your project (the more, the better) and we'll provide you a quote via email. As you are searching or browsing our Analytical Guide, you'll see the Request-A-Quote icon... just click on it to start the request process.
Request-A-Quote

Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   7 days from sample collection to extraction and 40 days from extraction to analysis.
Preservatives:   Cool samples to 4°C from sample collection until extraction. If residual chlorine is present add 80 mg of sodium thiosulfate per Liter of sample.
Required Preps:   1L amber glass bottle
Collection Method:   Grab sampling
Analytical Methodology:   GC/MS
Documentation:   625

Analyte List*

Analyte Formula CAS Number Detection Limit
4-Nitrophenol
C6H5NO3
100-02-7
2.4
 µg/L
4-Bromodiphenyl ether (4-MoBDE, IUPAC 3)
C12H9BrO
101-55-3
1.9
 µg/L
Heptachlor epoxide
C10H5Cl7O
1024-57-3
2.2
 µg/L
Endosulfan sulfate
C9H6Cl6O4S
1031-07-8
5.6
 µg/L
2,4-Dimethylphenol
C8H10O
105-67-9
2.7
 µg/L
1,4-Dichlorobenzene
C6H4Cl2
106-46-7
4.4
 µg/L
bis(2-Chloroisopropyl)ether
C6H12Cl2O
108-60-1
5.7
 µg/L
Phenol
C6H6O
108-95-2
1.5
 µg/L
Aroclor-1260
11096-82-5
 
Aroclor-1254
11097-69-1
36
 µg/L
Aroclor-1221
11104-28-2
30
 µg/L
Aroclor-1232
11141-16-5
 
bis(2-Chloroethyl)ether
C4H8Cl2O
111-44-4
5.7
 µg/L
bis(2-Chloroethoxy) Methane
C5H10Cl2O2
111-91-1
5.3
 µg/L
bis-(2-Ethylhexyl)phthalate
C24H38O4
117-81-7
2.5
 µg/L
Di-n-octyl phthalate
C24H38O4
117-84-0
2.5
 µg/L
Hexachlorobenzene
C6Cl6
118-74-1
1.9
 µg/L
Anthracene
C14H10
120-12-7
1.9
 µg/L
1,2,4-Trichlorobenzene
C6H3Cl3
120-82-1
1.9
 µg/L
2,4-Dichlorophenol
C6H4Cl2O
120-83-2
2.7
 µg/L
2,4-Dinitrotoluene
C7H6N2O4
121-14-2
5.7
 µg/L
Aroclor-1248
12672-29-6
 
Aroclor-1016
12674-11-2
 
Pyrene
C16H10
129-00-0
1.9
 µg/L
Dimethylphthalate
C10H10O4
131-11-3
1.6
 µg/L
Benzo(g,h,i)perylene
C22H12
191-24-2
4.1
 µg/L
Indeno(1,2,3-cd)pyrene
C22H12
193-39-5
3.7
 µg/L
Benzo[b]fluoranthene
C20H12
205-99-2
4.8
 µg/L
Fluoranthene
C16H10
206-44-0
2.2
 µg/L
Benzo[k]fluoranthene
C20H12
207-08-9
2.5
 µg/L
Acenaphthylene
C12H8
208-96-8
3.5
 µg/L
Chrysene
C18H12
218-01-9
2.5
 µg/L
Aldrin
C12H8Cl6
309-00-2
1.9
 µg/L
alpha-BHC
C6H6Cl6
319-84-6
 
beta-BHC
C6H6Cl6
319-85-7
 
delta-BHC
C6H6Cl6
319-86-8
4.2
 µg/L
Endosulfan II
C9H6Cl6O3S
33213-65-9
 
4,4'-DDT
C14H9Cl5
50-29-3
4.7
 µg/L
Benzo[a]pyrene
C20H12
50-32-8
2.5
 µg/L
2,4-Dinitrophenol
C6H4N2O5
51-28-5
42
 µg/L
4,6-Dinitro-2-methyl phenol
C7H6N2O5
534-52-1
24
 µg/L
Aroclor-1242
53469-21-9
 
Dibenz[a,h]anthracene
C22H14
53-70-3
2.5
 µg/L
1,3-Dichlorobenzene
C6H4Cl2
541-73-1
1.9
 µg/L
Benzo(a)anthracene
C18H12
56-55-3
7.8
 µg/L
Chlordane
C10H6Cl8
57-74-9
 
gamma-BHC (Lindane)
C6H6Cl6
58-89-9
 
4-Chloro-3-methylphenol
C7H7ClO
59-50-7
3
 µg/L
Dieldrin
C12H8Cl6O
60-57-1
2.5
 µg/L
2,6-Dinitrotoluene
C7H6N2O4
606-20-2
1.9
 µg/L
N-Nitrosodipropylamine
C6H14N2O
621-64-7
 
N-Nitrosodimethylamine
C2H6N2O
62-75-9
 
Hexachloroethane
C2Cl6
67-72-1
1.6
 µg/L
4-Chlorophenylphenylether
C12H9ClO
7005-72-3
4.2
 µg/L
Endrin
C12H8Cl6O
72-20-8
 
4,4'-DDD
C14H10Cl4
72-54-8
2.8
 µg/L
4,4'-DDE
C14H8Cl4
72-55-9
5.6
 µg/L
Endrin aldehyde
C12H8Cl6O
7421-93-4
 
Heptachlor
C10H5Cl7
76-44-8
1.9
 µg/L
Hexachlorocyclopentadiene
C5Cl6
77-47-4
 
Isophorone
C9H14O
78-59-1
2.2
 µg/L
Toxaphene
C10H10Cl8
8001-35-2
 
Acenaphthene
C12H10
83-32-9
1.9
 µg/L
Diethylphthalate
C12H14O4
84-66-2
1.9
 µg/L
Di-n-butylphthalate
C16H22O4
84-74-2
2.5
 µg/L
Phenanthrene
C14H10
85-01-8
5.4
 µg/L
Butylbenzylphthalate
C19H20O4
85-68-7
2.5
 µg/L
N-Nitrosodiphenylamine
C12H10N2O
86-30-6
1.9
 µg/L
Fluorene
C13H10
86-73-7
1.9
 µg/L
Hexachlorobutadiene
C4Cl6
87-68-3
0.9
 µg/L
Pentachlorophenol
C6HCl5O
87-86-5
3.6
 µg/L
2,4,6-Trichlorophenol
C6H3Cl3O
88-06-2
2.7
 µg/L
2-Nitrophenol
C6H5NO3
88-75-5
3.6
 µg/L
Naphthalene
C10H8
91-20-3
1.6
 µg/L
2-Chloronaphthalene
C10H7Cl
91-58-7
1.9
 µg/L
3,3'-Dichlorobenzidine
C12H10Cl2N2
91-94-1
16.5
 µg/L
Benzidine
C12H12N2
92-87-5
44
 µg/L
1,2-Dichlorobenzene
C6H4Cl2
95-50-1
1.9
 µg/L
2-Chlorophenol
C6H5ClO
95-57-8
3.3
 µg/L
Endosulfan I
C9H6Cl6O3S
959-98-8
 
Nitrobenzene
C6H5NO2
98-95-3
1.9
 µg/L

* 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.