Method 508

Determination of Chlorinated Pesticides in Water by Gas Chromatography With an Electron Capture Detector


This method is for the determination of certain chlorinated pesticides in groundwater and finished drinking water.  One liter of sample is extracted with methylene chloride by shaking in a separatory funnel or mechanical tumbling in a bottle. The extract is concentrated, solvent exchanged with methyl tert-butyl ether (MTBE) and anlayzed by capillary column GC with an electron capture detector (ECD).  Any positive detects are confirmed by analyzing with a second column.

Phthalate esters are the source of major interferences with the elctron capture detector.  Avoid use of any flexible tubing during sample collection.


(EPA: Office of Water)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Seven days from sample collection to extraction and 14 days from extraction to analysis.
Preservatives:   If residual chlorine is present, add 80 mg of sodium thiosulfate per L of sample prior to sample collection. Samples must be iced or refrigerated at 4°C from the time of collection until extraction.
Required Preps:   1L Amber glass bottle with Teflon-lined lid
Collection Method:   Grab sampling
Analytical Methodology:   GC/ECD
Documentation:   508
508

Analyte List*

Analyte Formula CAS Number Detection Limit
Heptachlor epoxide
C10H5Cl7O
1024-57-3
0.01
 µg/L
Endosulfan sulfate
C9H6Cl6O4S
1031-07-8
0.01
 µg/L
Aroclor-1260
11096-82-5
0.1
 µg/L
Aroclor-1254
11097-69-1
0.1
 µg/L
Aroclor-1221
11104-28-2
0.1
 µg/L
Aroclor-1232
11141-16-5
0.1
 µg/L
Hexachlorobenzene
C6Cl6
118-74-1
0.0077
 µg/L
Aroclor-1248
12672-29-6
0.1
 µg/L
Aroclor-1016
12674-11-2
0.08
 µg/L
Trifluralin
C13H16F3N3O4
1582-09-8
0.025
 µg/L
2,3,5,6-Tetrachloro-1,4-benzenedicarboxylic acid dimethyl ester (Dacthal)
C10H6Cl4O4
1861-32-1
0.011
 µg/L
Chlorothalonil (Bravo)
C8Cl4N2
1897-45-6
0.025
 µg/L
Atrazine
C8H14ClN5
1912-24-9
0.01
 µg/L
Propachlor
C11H14ClNO
1918-16-7
0.25
 µg/L
Etridiazole
C5H5Cl3N2OS
2593-15-9
0.013
 µg/L
Chloroneb
C8H8Cl2O2
2675-77-6
0.5
 µg/L
Aldrin
C12H8Cl6
309-00-2
0.01
 µg/L
alpha-BHC
C6H6Cl6
319-84-6
0.025
 µg/L
beta-BHC
C6H6Cl6
319-85-7
0.01
 µg/L
delta-BHC
C6H6Cl6
319-86-8
0.01
 µg/L
Endosulfan II
C9H6Cl6O3S
33213-65-9
0.024
 µg/L
4,4'-DDT
C14H9Cl5
50-29-3
0.06
 µg/L
Chlorobenzilate (Acaraben)
C16H14Cl2O3
510-15-6
5
 µg/L
alpha-Chlordane
C10H6Cl8
5103-71-9
0.0015
 µg/L
gamma-Chlordane
C10H6Cl8
5103-74-2
0.0015
 µg/L
trans-Permethrin
C21H20Cl2O3
51877-74-8
0.5
 µg/L
Aroclor-1242
53469-21-9
0.1
 µg/L
cis-Permethrin
C21H20Cl2O3
54774-45-7
0.5
 µg/L
Chlordane
C10H6Cl8
57-74-9
0.1
 µg/L
gamma-BHC (Lindane)
C6H6Cl6
58-89-9
0.01
 µg/L
Dieldrin
C12H8Cl6O
60-57-1
0.01
 µg/L
Endrin
C12H8Cl6O
72-20-8
0.01
 µg/L
Methoxychlor
C16H15Cl3O2
72-43-5
0.05
 µg/L
4,4'-DDD
C14H10Cl4
72-54-8
0.025
 µg/L
4,4'-DDE
C14H8Cl4
72-55-9
0.01
 µg/L
Endrin aldehyde
C12H8Cl6O
7421-93-4
0.025
 µg/L
Heptachlor
C10H5Cl7
76-44-8
0.01
 µg/L
Toxaphene
C10H10Cl8
8001-35-2
0.5
 µg/L
Endosulfan I
C9H6Cl6O3S
959-98-8
0.015
 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.