EPA Method 1664

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EPA Method 1664:
Oil and Grease and Non-polar Material Using Solvent Extraction and Gravimetry. Official Name: N-Hexane Extractable Material (HEM; Oil and Grease) and Silica Gel Treated N-Hexane Extractable Material (SGT-HEM; Non-Polar Material) by Extraction and Gravimetry

Summary:
A 1-L sample is acidified and serially extracted three times with n-hexane in a separatory funnel. The extract is dried over sodium sulfate. The solvent is distilled from the extract and the residue from the extract is desiccated. The amount of HEM in the extract is measured by weighing the dry residue on a balance. If the HEM is to be used for determination of SGT-HEM, the HEM is redissolved in n-hexane and silica gel is added to remove polar materials. The solution is filtered to remove the silica gel, the solvent is distilled, and the residue is desiccated. The amount of SGT-HEM in the extract is measured by weighing the dry residue on a balance.

Scope:
This method determines n-hexane extractable material (HEM; oil and grease) and n-hexane extractable material that is not adsorbed by silica gel (SGT-HEM; non-polar material) in surface and saline waters and industrial and domestic aqueous wastes. HEM includes relatively non-volatile hydrocarbons, vegetable oils, animal fats, waxes, soaps, greases, and related materials.

Citation:
EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

Interferences:
(A) Reagent contamination: Use high purity reagents.(B) Glassware contamination: Thoroughly clean glassware, including detergent wash and solvent rinse.(C) Interfering mass: Use a 0.45 micron filter if filter paper appears to allow the passage of sodium sulfate or silica gel fines that will be included in HEM/SGT-HEM weighing.(D) Emulsions: Use procedures in the method to break emulsions caused by complex matrices.

QC Requirements:
The minimum recommended quality control requirements of this program consist of an initial demonstration of laboratory capability [analysis of initial precision and recovery samples (IPR), and determination of a method detection limit (MDL)], ongoing analysis of standards and blanks as a test of method performance.

Maximum Holding Time:
28 days.

Media:
WATER

Subcategory:
Organic

Concentration:
5 - 1000 mg/L

Precision:
Precision and accuracy values were determined using combined data from single laboratory and interlaboratory studies.

Detection:
The MDL was determined at multiple laboratories per the procedure at 40 CFR part 136, Appendix B. The pooled single-operator MDL, using the 34 MDLs listed above plus the 5 MDLs EPA reported at proposal.

Revision Number:
Revision A, February 1999

Test Description:
Oil & Grease and Tot

Report Number:
821/B-94-004b

Instrument used for this test:
Balance