Oil and Grease

Authored by: Pradyot Patnaik

Handbook of Environmental Analysis

Print publication date:  August  2017
Online publication date:  August  2017

Print ISBN: 9781498745611
eBook ISBN: 9781315151946
Adobe ISBN:

10.1201/9781315151946-41

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Abstract

The term oil and grease refers to neither a broad group of substances nor to any individual compound or specific group of substances with similar chemical structures or properties. Although the term is defined as all materials that may be recovered from the sample matrices when extracted by a suitable organic solvent and therefore is specific to a method or the solvent in use, in a broader sense of the term it generally infers to the oily and greasy materials that are mostly biological lipids and/or mineral hydrocarbons. Several solvents are known for their extraction efficiency. They include petroleum ether, trichlorotrifluoroethane, hexane, and hexane–MTBE mixtures. Thus, the substances recovered may vary from solvent to solvent. The use of fluorochlorocarbon solvent has been discontinued because of its harmful effects on the environment. Oil and grease in aqueous samples can be determined by the following methods:

Partition-gravimetric method

Partition-infrared method

Soxhlet extraction method

Solid phase partition-gravimetric method

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