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5520 Oil and Grease

5520 Oil and Grease

Approved by SM Committee: 2001

[E] - EPA Approved
[R] - Revised
[N] - New Methods

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Description

Four methods are presented for liquid samples. The first is the partition-gravimetric method (5520B). The partition-infrared method (5520C) is designed for samples that might contain volatile hydrocarbons that otherwise would be lost in the solvent-removal operations of the gravimetric procedure. It is the method of choice for low levels of oil and grease (<10 mg/L) because gravimetric methods do not provide the needed precision. The Soxhlet extraction method (5520D) is the method of choice when relatively polar, heavy petroleum fractions are present, or when the levels of nonvolatile greases may challenge the solubility limit of the solvent. The new 5520G can be used as an alternative to 5520B to reduce solvent volumes and matrix problems. Method 5520E is a modification of the Soxhlet method and is suitable for sludges and similar materials. Method 5520F can be used in conjunction with 5520 B, C, D, or G to obtain a hydrocarbon measurement in addition to, or instead of, the oil and grease measurement. It makes use of silica gel to separate petroleum hydrocarbons from the total oil and grease on the basis of polarity.

Methods

[E] [R] [N] Product
  [R]    A. Introduction
[E] [R]    B. Liquid-Liquid, Partition-Gravimetric Method
  [R]    C. Partition-Infrared Method
  [R]    D. Soxhlet Extraction Method
  [R]    E. Extraction Method for Sludge Samples
  [R]    F. Hydrocarbons
    [N]  G. Solid-Phase, Partition-Gravimetric Method