This method is for the determination of 1,2-dibromoethane (EDB), 1,2-dibromo-3-chloropropane (DBCP), 1,2,3-trichloropropane (123TCP) in finished drinking water and groundwater. The aqueous sample is extracted with hexane and analyzed by GC/ECD (electron capture detector).
The working concentration range for the method for these compounds is approximately 0.03 - 200 µg/L.
Positive analyte results must be confirmed. Use of a second GC column is sufficient but GC/MS analysis by Methods 524.1 or 524.2 can also be used if the analyte concentrations are high enough.
Dibromochloromethane (DBCM) is a common disinfection byproduct found in chlorinated drinking water that is frequently found at relatively high concentrations. DBCM can elute very clost to EDB and a high concentration could mask low levels of EDB or be misidentified as EDB.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | All samples must be analyzed within 14 days of collection. |
| Preservatives: | 3 mg of sodium thiosulfate crystals or 75µl (40mg/L) sodium thiosulfate solution should be added to bottle prior to shipping to sampling site. Store samples at ≤ 4°C until analysis. |
| Required Preps: | 40mL VOA vials with Teflon-lined cap |
| Collection Method: | Grab sampling |
| Analytical Methodology: | GC/ECD |
| Documentation: | 
504.1
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| 1,2-Dibromoethane | C2H4Br2 |
106-93-4 |
0.01 |
µg/L |
| 1,2-Dibromo-3-Chloropropane | C3H5Br2Cl |
96-12-8 |
0.01 |
µg/L |
| 1,2,3-Trichloropropane | C3H5Cl3 |
96-18-4 |
0.02 |
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.