Provisional Standard Test Methods for Oil and Grease (Solvent Extractable Substances) by Gravimetric Determination
|Publication Date:||27 December 1995|
1.1 These test methods cover the estimation of oil and grease in water and wastewater by a gravimetric determination of solvent extractable substances from an acidified sample. Also included in this estimation of oil and grease are any other compounds soluble in the organic solvent (n-hexane) nonvolatile under the conditions of the test.
1.2 These test methods are applicable to natural waters and domestic wastewaters. They are also suitable for most industrial wastewaters, although certain wastes may yield low results because of the presence of either excessive concentrations of natural greases or synthetic or modified compounds that are not well recovered by these test methods.
1.3 These test methods measure those groups of substances called oil and grease, whether soluble or insoluble, polar or nonpolar, or biological or mineral in origin, to the extent these substances partition from the matrix into the organic extraction solvent and are not volatilized under conditions of the test. See also the Introduction and 3.2.1 of these test methods.
1.4 Results using one extraction solvent, for example, n-hexane, are not usually comparable to results using another extraction solvent, for example, di-ethyl ether or tetrachloroethene, or 1,1,2-trichloro-1,2,
1.5 Because these test methods include an acidification step prior to extraction, soluble metallic soaps are hydrolyzed and recovered as fatty acids in the extraction step.
NOTE 1--Refer to companion procedures Test Methods D 392 I and D 4281.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 11.4, 12.2, 12.8, 12.10, 19.7, 20.2, 20.6, and 20.7.