Method 625

Base/Neutrals and Acids by GC/MS

Scope:

This method covers the determination of a number of organic compounds that are partitioned into an organic solvent and are amenable to gas chromatography. 

This is a gas chromatographic/mass spectrometry (GC/MS) method applicable to the determination of the compounds listed in the municipal and industrial discharges as provided under 40 CFR Part 136.1.  

 A measured volume of sample, approximately 1 L, is serially extracted with methylene chloride at a pH greater than 11 and again at a pH less than 2 using a separatory funnel or a continuous extractor.2 The methylene chloride extract is dried, concentrated to a volume of 1 mL, and analyzed by GC/MS. Qualitative identification of the parameters in the extract is performed using the retention time and the relative abundance of three characteristic masses (m/z). Quantitative analysis is performed using internal standard techniques with a single characteristic m/z.

-EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

 

Method Data

Method 8270
Hold Time7 days (prior to extraction) 40 days (after extraction)
PreservationStore the extract at 4 degrees C
Sample VolumeCollect at least 1 L of sample in an amber glass container
Method RefernceEPA Method 8270

Analyte List

Analyte
1,2,4-Trichlorobenzene
1,2-Dichlorobenzene
1,2-Diphenylhydrazine
1,3-Dichlorobenzene
1,4-Dichlorobenzene
2,4,6-Trichlorophenol
2,4-Dichlorophenol
2,4-Dimethylphenol
2,4-Dinitrophenol
2,4-Dinitrotoluene
2,6-Dinitrotoluene
2-Chloronaphthalene
2-Chlorophenol
2-Methylphenol
2-Nitrophenol
3,3´-Dichlorobenzidine
3,4-Methylphenol
4,6-Dinitro-2-methylphenol
4-Bromophenyl phenyl ether
4-Chloro-3-methylphenol
4-Chlorophenyl phenyl ether
4-Nitrophenol
Aniline
Anthracene
Azobenzene
Benz(a)anthracene
Benzidine
Benzo(a)pyrene
Benzo(b)fluoranthene
Benzo(g,h,i)perylene
Benzo(k)fluoranthene
Benzoic Acid
Bis(2-chloroethoxy)methane
Bis(2-chloroethyl)ether
Bis(2-chloroisopropyl)ether
Bis(2-ethylhexyl)phthalate
Acenaphthene
Butyl benzyl phthalate
Carbazole
Chrysene
Di-n-butyl phthalate
Di-n-octyl phthalate
Dibenz(a,h)anthracene
Diethyl phthalate
Dimethyl phthalate
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclopentadiene
Hexachloroethane
Indeno(1,2,3-cd)pyrene
Isophorone
N-Nitrosodi-n-propylamine
N-Nitrosodimethylamine
N-Nitrosodiphenylamine
Acenaphthylene
Naphthalene
Nitrobenzene
Pentachlorophenol
Phenanthrene
Phenol
Pyrene
Pyridine

*Please contact our project management team for more information about reporting limits and other specific project needs.

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