This method is applicable to the determination of chlorination disinfection byproducts and chlorinated solvents in finished drinking water, drinking water during intermediate stages oftreatment, and raw source water. A 35 mL sample aliquot is extracted with 2 mL of methyl-tert-butyl ether (MTBE). Two µL of the extract is then injected into a GC equipped with a fused silica capillary column and linearized electron capture detector for separation and analysis. Aqueous calibration standards are also extracted and analyzed in order to compensate for any extraction losses. A typical sample can be extracted and analyzed in 40-50 minutes using the primary column chosen for this method. Confirmation of the eluted compounds may be obtained using a dissimilar column or by the use of GC/MS.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Analyze all samples within 14 days of collection. Samples not analyzed within this period must be discarded and replaced. |
| Preservatives: | Store samples at 4°C until analysis. The sample storage area must be free of organic solvent vapors. Analysis for the total analyte list requires the use of ammonium chloride for dechlorination and sample acidification. Sample pH must be adjusted to 4.5-5.0. |
| Required Preps: | Glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | GC/ECD |
| Documentation: | 
551
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| 1,2-Dibromoethane | C2H4Br2 |
106-93-4 |
0.006 |
µg/L |
| Chlorodibromomethane | CHBr2Cl |
124-48-1 |
0.012 |
µg/L |
| Tetrachloroethene | C2Cl4 |
127-18-4 |
0.004 |
µg/L |
| Dichloroacetonitrile | C2HCl2N |
3018-12-0 |
0.019 |
µg/L |
| Dibromoacetonitrile | C2HBr2N |
3252-43-5 |
0.034 |
µg/L |
| 1,1-Dichloroacetone | C3H4Cl2O |
513-88-2 |
0.005 |
µg/L |
| Trichloroacetonitrile | C2Cl3N |
545-06-2 |
0.092 |
µg/L |
| Carbon tetrachloride | CCl4 |
56-23-5 |
0.004 |
µg/L |
| Chloroform | CHCl3 |
67-66-3 |
0.002 |
µg/L |
| 1,1,1-Trichloroethane | C2H3Cl3 |
71-55-6 |
0.008 |
µg/L |
| Bromoform | CHBr3 |
75-25-2 |
0.012 |
µg/L |
| Bromodichloromethane | CHBrCl2 |
75-27-4 |
0.006 |
µg/L |
| Trichloroacetaldehyde | C2HCl3O |
75-87-6 |
0.026 |
µg/L |
| Chloropicrin | CCl3NO2 |
76-06-2 |
0.012 |
µg/L |
| Trichloroethene | C2HCl3 |
79-01-6 |
0.002 |
µg/L |
| Bromochloroacetonitrile | C2HBrClN |
83463-62-1 |
0.11 |
µg/L |
| 1,1,1-Trichloroacetone | C3H3Cl3O |
918-00-3 |
0.012 |
µg/L |
| 1,2-Dibromo-3-Chloropropane | C3H5Br2Cl |
96-12-8 |
0.009 |
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.