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May 25th, 2013, 3:33am
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oil and grease test vs FOG test (Read 830 times)
sludge judge Hennessy
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oil and grease test vs FOG test
Oct 19th, 2010, 6:58pm
 
Is there a difference? Is there a separate test for FOGs that includes fats? thanks in advance, forgive me if this is an ignorant question, I couldn't find what I was looking for on google.

regards,

Ryan
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Eric Raj
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Re: oil and grease test vs FOG test
Reply #1 - Oct 20th, 2010, 8:45am
 
I do not think so.  If you were to need data for specific fats, then I would imagine that there would a different test method applied each time.  I did find mention of analyzers that detect total oil and grease concentrations, TPH, or FOG.  And an ASTM Method, D 7066-04, was mentioned.  But it would seem that fats eventually become grease and thus fall into that EPA 1664-A methodology for analysis.

~Eric
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Jim Royer
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Re: oil and grease test vs FOG test
Reply #2 - Oct 25th, 2010, 12:40pm
 
FOG would be the total of Fats, Oils, and Grease. TPH would be total petroleum hydrocarbon or the non polar FOG. The polar , vegtable oil, would be adsorbed onto silica gel.
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PamS
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Re: oil and grease test vs FOG test
Reply #3 - Nov 1st, 2010, 9:42am
 
Ryan,

There is a lot of confusion when throwing around acronymns for oil and grease testing.  EPA does not use the word "fat" in the method name of 1664A.  EPA defines "oil & grease" as the material extracted by the selected solvent: "For most wastes and wastewaters, materials commonly extracted are relatively non-volatile hydrocarbons, vegetable oils, animal fats, waxes, soaps, greases, and related materials. Because the nature and amount of material extracted is defined by the solvent and, to a lesser degree, by the details of the procedure used for extraction, EPA uses the term ''method-defined analyte'' to identify oil and grease.

The current approved US EPA Method is 1664A and it uses n-hexane to extract the material from the sample, so sometimes the test is referred to as HEM.  Prior to the Montreal Protocol (which banned ozone depleting substances in the 1990's), freon was the extractant used.  So to me - FOG - is an acronymn for FREON oil and grease.  Which many people took to mean Fats, Oils and Grease.

So when referring to the test now, 1664A, HEM (sometimes SGT-HEM when silica gel is used to treat the sample) or if a filter is used the test is sometimes referred to as  SPE (solid phase extraction) or just old oil & grease or O&G are the more correct forms to use to referr to the test.  There are still die hards out there that use FOG - that's fine, we know what they mean as we can no longer purchase freon to run a  freon O&G.

Pam
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sludge judge Hennessy
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Re: oil and grease test vs FOG test
Reply #4 - Nov 1st, 2010, 11:09am
 
thanks Pam!
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Jim Royer
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Re: oil and grease test vs FOG test
Reply #5 - Nov 5th, 2010, 10:48am
 
FOG has been used for oil & grease before Freon was the solvent of choice. Everyone knows what FOG means and it is shorter than writing oil and grease. Fats are mostly a mixture of triglycerides with some mono and di glycerides. Oils are a liquid at room temperature and grease is a solid. Each solvent used will determine what mixture of fats, oils, waxes, and soaps will be extracted based on the solubility.
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