NOTE: this method has been replace by EPA Method 1664 because of EPA's mandate to remove the fluorocarbon CFC-113 from use.
This method is for the determination of total petroleum hydrocarbons (TPH) from surface and saline waters, industrial and domestic wastes. An aliquot of sample is acidified to a low pH ( < 2) and serially extracted with fluorocarbon-113 in a separatory funnel. Interferences are removed with silica gel adsorbent. Infrared analysis of the extract is performed by direct comparison with standards.
The method is applicable to measurement of light fuels, although loss of about half of any gasoline present during the extraction manipulations can be expected. The method is sensitive to levels of 1 mg/L and less, and may be extended to ambient monitoring.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | No special requirements. |
| Preservatives: | Cool sample to 4°C if samples will not be analyzed within 48 hours of collection. Add 5 mL HCl if samples will not be analyzed within 4 hours of sample collection. |
| Required Preps: | 1L amber glass bottle |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Infrared spectrophotometer |
| Documentation: | 
418.1
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Total Petroleum Hydrocarbons | 1 |
mg/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.