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Oelic Acid in my blanks?

Discussions about GC and other "gas phase" separation techniques.

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Oelic Acid in my blanks?

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semivoadude
Oelic acid has been found in my blank aqueous samples. Im extacting TPH/PAH samples using MEcl2 (EPA methods 8100,8270)

Oelic acid is a fatty acid, does anyone know any sources of this peak?
Or how it could get into my blanks/samples?
thanks

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chromatographer1
glassware, soaps, fingerprints, pipettes, atmospheric pollution
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