This method is for the determination of PCBs (Aroclors) and organochlorine pesticides from municipal and industrial wastewater. One Liter of sample is extracted with methylene chloride using a separatory funnel. The methylene chloride extract is dried and solvent exchanged to hexane to a volume of 10mL or less and analyzed by gas chromatography with an electron caputure detector (GC/ECD). Any positive detects must be confirmed on a secondary column.
If needed a Florisil column cleanup and elemental sulfur removal can be performed to remove interferences from the sample matrix.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 7 days from collection to extraction and 40 days from extraction to analysis. |
| Preservatives: | Cool to 4°C from sample collection until extraction. Adjust pH to 5.0-9.0 with sodium hydroxide or sulfuric acid if extraction will be within 72 hours of collection. For aldrin: add sodium thiosulfate when residual chlorine is present. |
| Required Preps: | 1L amber glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | GC/ECD |
| Documentation: | 
608
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Heptachlor epoxide | C10H5Cl7O |
1024-57-3 |
0.083 |
µg/L |
| Endosulfan sulfate | C9H6Cl6O4S |
1031-07-8 |
0.066 |
µg/L |
| Aroclor-1260 | 11096-82-5 |
0.5 |
µg/L | |
| Aroclor-1254 | 11097-69-1 |
0.5 |
µg/L | |
| Aroclor-1221 | 11104-28-2 |
0.5 |
µg/L | |
| Aroclor-1232 | 11141-16-5 |
0.5 |
µg/L | |
| Aroclor-1248 | 12672-29-6 |
0.5 |
µg/L | |
| Aroclor-1016 | 12674-11-2 |
0.5 |
µg/L | |
| Aldrin | C12H8Cl6 |
309-00-2 |
0.004 |
µg/L |
| alpha-BHC | C6H6Cl6 |
319-84-6 |
0.003 |
µg/L |
| beta-BHC | C6H6Cl6 |
319-85-7 |
0.006 |
µg/L |
| delta-BHC | C6H6Cl6 |
319-86-8 |
0.004 |
µg/L |
| Endosulfan II | C9H6Cl6O3S |
33213-65-9 |
0.004 |
µg/L |
| 4,4'-DDT | C14H9Cl5 |
50-29-3 |
0.012 |
µg/L |
| Aroclor-1242 | 53469-21-9 |
0.5 |
µg/L | |
| Chlordane | C10H6Cl8 |
57-74-9 |
0.014 |
µg/L |
| gamma-BHC (Lindane) | C6H6Cl6 |
58-89-9 |
0.009 |
µg/L |
| Dieldrin | C12H8Cl6O |
60-57-1 |
0.002 |
µg/L |
| Endrin | C12H8Cl6O |
72-20-8 |
0.006 |
µg/L |
| 4,4'-DDD | C14H10Cl4 |
72-54-8 |
0.011 |
µg/L |
| 4,4'-DDE | C14H8Cl4 |
72-55-9 |
0.004 |
µg/L |
| Endrin aldehyde | C12H8Cl6O |
7421-93-4 |
0.023 |
µg/L |
| Heptachlor | C10H5Cl7 |
76-44-8 |
0.003 |
µg/L |
| Toxaphene | C10H10Cl8 |
8001-35-2 |
0.24 |
µg/L |
| Endosulfan I | C9H6Cl6O3S |
959-98-8 |
0.014 |
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.