This method is for the determination of chlorinated acid herbicides in aqueous matrices. An aliquot of the sample is extracted with diethyl ether and then esterified with either diazomethane or pentafluorobenzyl bromide. The derivitives are analyzed by gas chromatography with an electron capture detector (GC/ECD). Results are reported as acid equivalents.
This method replaces Method 8150.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 7 days from sampling to extraction and 40 days from extraction to analysis |
| Preservatives: | Without residual chlorine: Cool to ≤ 6°C. With residual chlorine: Add 3 ml 10% sodium thiosulfate solution per gallon. Cool to 4°C. Protect samples from light. |
| Required Preps: | 1L amber glass bottle |
| Collection Method: | Grab sampling, SW-846, Chapter 4, Section 4.1.2 |
| Analytical Methodology: | GC/ECD |
| Documentation: | 
8151A
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| 4-Nitrophenol | C6H5NO3 |
100-02-7 |
0.13 |
µg/L |
| Dichloroprop | C9H8Cl2O3 |
120-36-5 |
0.26 |
µg/L |
| Chloramben | C7H5Cl2NO2 |
133-90-4 |
0.093 |
µg/L |
| Dicamba | C8H6Cl2O3 |
1918-00-9 |
0.081 |
µg/L |
| Picloram | C6H3Cl3N2O2 |
1918-02-1 |
0.14 |
µg/L |
| DCPA diacid | 2136-79-0 |
0.02 |
µg/L | |
| Bentazon | C10H12N2O3S |
25057-89-0 |
0.2 |
µg/L |
| Acifluorfen | C14H7ClF3NO5 |
50594-66-6 |
0.096 |
µg/L |
| 3,5-Dichlorobenzoic acid | C7H4O2Cl2 |
51-36-5 |
0.061 |
µg/L |
| Dalapon | C3H4Cl2O2 |
75-99-0 |
1.3 |
µg/L |
| 5-Hydroxydicamba | C8H6Cl2O4 |
7600-50-2 |
0.04 |
µg/L |
| Pentachlorophenol | C6HCl5O |
87-86-5 |
0.076 |
µg/L |
| Dinoseb | C10H12N2O5 |
88-85-7 |
0.19 |
µg/L |
| MCPP | 93-65-2 |
0.09 |
µg/L | |
| 2,4,5-TP (Silvex) | C9H7Cl3O3 |
93-72-1 |
0.075 |
µg/L |
| 2,4,5-T | C8H5Cl3O3 |
93-76-5 |
0.08 |
µg/L |
| MCPA | C9H9ClO3 |
94-74-6 |
0.056 |
µg/L |
| 2,4-D | C8H6Cl2O3 |
94-75-7 |
0.2 |
µg/L |
| 2,4-DB | C10H10Cl2O3 |
94-82-6 |
0.8 |
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.