This is a gas chromatographic (GC) method applicable to the determination of halogenated acetic acids (HAA's) in drinking water, ground water, raw source water and water at any intermediate treatment stage. In addition, the chlorinated herbicide, Dalapon, can be determined using this method.
A 40mL sample is adjusted to pH < 0.5 and extracted with 4mL of methyl-tert-butyl-ether (MTBE). The haloacetic acids are partitioned into the organic phase and converted to their methyl ester by addition of acidic methanol followed by slight heating. The acidic extract is neutralized by a backextraction with a saturated solution of sodium bicarbonate. The sample is analyzed by GC/ECD (electron capture detector).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 14 days from sample collection to analysis if sample have been preserved. 7 days from extraction to analysis if samples kept at 4°C and 14 days if kept at <-10°C. |
| Preservatives: | Add crystalline or granular ammonium chloride (NH4Cl), 5mg per 50mL container, to bottle prior to collection. Store samples at 4°C and keep away from light. |
| Required Preps: | 50mL Amber glass bottle with Teflon-lined lid |
| Collection Method: | Grab sampling |
| Analytical Methodology: | GC/ECD |
| Documentation: | 
552.2
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Dibromoacetic acid (DBAA) | C2H2Br2O2 |
631-64-1 |
0.2 |
μg/L |
| Tribromoacetic acid (TBAA) | C2HBr3O2 |
75-96-7 |
1.5 |
μg/L |
| Dalapon | C3H4Cl2O2 |
75-99-0 |
0.4 |
μg/L |
| Trichloroethanoic acid (TCAA) | C2HCl3O2 |
76-03-9 |
0.2 |
μg/L |
| Monobromoacetic acid (MBAA) | C2H3BrO2 |
79-08-3 |
0.2 |
μg/L |
| Monochloracetic Acid (MCAA) | C2H3ClO2 |
79-11-8 |
0.6 |
μg/L |
| Dichloroacetic acid (DCAA) | C2H2Cl2O2 |
79-43-6 |
0.24 |
μg/L |
| Bromochloroacetic acid (BCAA) | BrClCHCOOH |
5589-96-3 |
0.25 |
μg/L |
| Bromodichloroacetic acid (BDCAA) | BrCl2CO2H |
7113-314-7 |
0.4 |
μg/L |
| Chlorodibromoacetic acid (CDBAA) | C2HBr2ClO2 |
5278-95-5 |
0.75 |
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.