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2. USEPA.Notice of Final NPDES General Permit for New and Existing Sources and New Dischargers in the Offshore Subcategory of the Oil and Gas Extraction Category for the Western Portion of the Outer Continental Shelf of the Gulf of Mexico(GMG290000), FRL‐7119‐5, Federal Register, 66 (243), Tuesday, December 18, 2001, notices, 65209; Environmental Protection Agency
3. USEPA.Method 1664, Revision A: N‐Hexane Extractable Material (HEM; Oil and Grease) and Silica Gel Treated N‐Hexane Extractable Material (SGT‐HEM; Non‐Polar Material) by Extraction and Gravimetry, EPA‐821‐R‐98‐002; Environmental Protection Agency
4. Room temperature ionic liquids as replacements for conventional solvents – A review