Hello, I am trying to develop an extraction method for EPA 8015 diesel and motor oil using the organomation continuous extraction system. My recoveries have been low and I can extract residual analyte from the hydrophobic disc after the extraction has finished. I am using corning membranes cat 3918-47 that we also use for 625 extraction.

Does anyone have any clues as to a better way to extract aqueous samples for diesel. Besides sep funnel.

thanks