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.
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| 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 | 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.