Method 418.1

Petroleum Hydrocarbons, Total Recoverable

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. 

(EPA: Office of Water)


No Obligation Quotation for Analytical Services

If you would like us to provide a quote for laboratory analysis, just provide us with as much information as you can about your project (the more, the better) and we'll provide you a quote via email. As you are searching or browsing our Analytical Guide, you'll see the Request-A-Quote icon... just click on it to start the request process.

Method Data

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 List*

Analyte Formula CAS Number Detection Limit
Total Petroleum Hydrocarbons

* 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.