USGS-NWQL: O-5108: Oil and grease extractable from bottom material, gravimetric
|
Official Method Name
|
Oil and grease, extractable from bottom material, extraction-gravimetric |
|---|---|
|
Current Revision
| 1976 |
|
Media
|
SOILS/SEDIMENT |
|
Instrumentation
|
Gravimetry |
|
Method Subcategory
|
Organic |
|
Method Source
|
|
|
Citation
|
Methods for the Determination of Organic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the United States Geological Survey, Book 5, Chapter A3 Edited by R.L. Wershaw, M.J. Fishman, R.R Grabbe, and L.E. Lowe |
|
Brief Method Summary
|
A sample is extracted twice with trichlorotrifluoroethane and the extract is evaporated at 20oC to leave a nonvolatile residue whose weight represents an estimate of the extractable organic matter in the sample. |
|
Scope and Application
|
This method is suitable for the determination of oil and grease in air-dried bottom materials containing at least 1,000 mg/kg. This method may be used for the determination of oil and grease in wet bottom materials if the appropriate moisture correction is applied. |
|
Applicable Concentration Range
|
NA |
|
Interferences
|
Organic solvents vary considerably in their ability to dissolve oil substances and other organic matter. Any method used to obtain an estimate of the amount of extractable organic matter must, of necessity, be highly empirical. Close attention to all operations of the analytical procedure are required to obtain reproducible results. |
|
Quality Control Requirements
|
Laboratory blanks (LB) |
|
Sample Handling
|
|
|
Maximum Holding Time
|
14 days |
|
Relative Cost
|
Less than $50 |
|
Sample Preparation Methods
|
