This is a gas chromatographic (GC) method applicable to the determination of the compounds listed above in municipal and industrial discharges as provided under 40 CFR Part 136.1. A measured volume of sample, approximately 1 L, is extracted with methylene chloride using a separatory funnel. The methylene chloride extract is dried and exchanged to hexane during concentration to a volume of 10 mL or less. Isophorone and nitrobenzene are measured by flame ionization detector gas chromatography (FIDGC). The dinitrotoluenes are measured by electron capture detector gas chromatography (ECDGC). The method provides a Florisil column cleanup procedure to aid in the elimination of interferences that may be encountered.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | All samples must be extracted within seven days of collection and completely analyzed within 40 days of extraction. |
| Preservatives: | All samples must be iced or refrigerated at 4°C from the time of collection until extraction. |
| Required Preps: | Glass bottle |
| Collection Method: | Grab or composite sampling |
| Analytical Methodology: | GC/FID or GC/ECD |
| Documentation: | 
609
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| 2,4-Dinitrotoluene | C7H6N2O4 |
121-14-2 |
0.02 |
µg/L |
| 2,6-Dinitrotoluene | C7H6N2O4 |
606-20-2 |
0.01 |
µg/L |
| Isophorone | C9H14O |
78-59-1 |
15.7 |
µg/L |
| Nitrobenzene | C6H5NO2 |
98-95-3 |
13.7 |
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.