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    Documents | Analysis of Extract Drying Criteria for Oil and Grease Method 1664A/B

    Analysis of Extract Drying Criteria for Oil and Grease Method 1664A/B

    US EPA Method 1664 for Hexane Extractable Material (HEM) or Oil and Grease has allowed use of solid phase extraction (SPE) instead of liquid-liquid extraction (LLE) with hexane since 2007 and this has been widely adopted in the US. SPE is an equivalent extraction technique to LLE and produces the same n-hexane extract. The extract, similar to LLE, may contain residual water that must be treated properly and removed from the n-hexane extract.

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