Method 8151A Water

Chlorinated Herbicides by GC Using Methylation or Pentafluorobenzylation Derivatization


This method is for the determination of chlorinated acid herbicides in aqueous matrices.  An aliquot of the sample is extracted with diethyl ether and then esterified with either diazomethane or pentafluorobenzyl bromide.  The derivitives are analyzed by gas chromatography with an electron capture detector (GC/ECD).  Results are reported as acid equivalents.

This method replaces Method 8150.


(EPA SW-846)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   7 days from sampling to extraction and 40 days from extraction to analysis
Preservatives:   Without residual chlorine: Cool to ≤ 6°C. With residual chlorine: Add 3 ml 10% sodium thiosulfate solution per gallon. Cool to 4°C. Protect samples from light.
Required Preps:   1L amber glass bottle
Collection Method:   Grab sampling, SW-846, Chapter 4, Section 4.1.2
Analytical Methodology:   GC/ECD
Documentation:   8151A

Analyte List*

Analyte Formula CAS Number Detection Limit
4-Nitrophenol
C6H5NO3
100-02-7
0.13
 µg/L
Dichloroprop
C9H8Cl2O3
120-36-5
0.26
 µg/L
Chloramben
C7H5Cl2NO2
133-90-4
0.093
 µg/L
Dicamba
C8H6Cl2O3
1918-00-9
0.081
 µg/L
Picloram
C6H3Cl3N2O2
1918-02-1
0.14
 µg/L
DCPA diacid
2136-79-0
0.02
 µg/L
Bentazon
C10H12N2O3S
25057-89-0
0.2
 µg/L
Acifluorfen
C14H7ClF3NO5
50594-66-6
0.096
 µg/L
3,5-Dichlorobenzoic acid
C7H4O2Cl2
51-36-5
0.061
 µg/L
Dalapon
C3H4Cl2O2
75-99-0
1.3
 µg/L
5-Hydroxydicamba
C8H6Cl2O4
7600-50-2
0.04
 µg/L
Pentachlorophenol
C6HCl5O
87-86-5
0.076
 µg/L
Dinoseb
C10H12N2O5
88-85-7
0.19
 µg/L
MCPP
93-65-2
0.09
 µg/L
2,4,5-TP (Silvex)
C9H7Cl3O3
93-72-1
0.075
 µg/L
2,4,5-T
C8H5Cl3O3
93-76-5
0.08
 µg/L
MCPA
C9H9ClO3
94-74-6
0.056
 µg/L
2,4-D
C8H6Cl2O3
94-75-7
0.2
 µg/L
2,4-DB
C10H10Cl2O3
94-82-6
0.8
 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.