Analytical method guidance for epa method 1664a implementation and use 40 cfr part 6 united states. Method 1664a also uses n hexane as the extraction solvent. Oil and grease is considered a methoddefined parameter per the definition in the code of federal regulations. Flush through the sampling point until main distribution water is. Sampling instructions take caution with the preservative sulfuric acid is acidic. It is used to determine certain volatile organic pollutants specific to the pharmaceutical manufacturing industry pmi that are amenable to purgeandtrap gas chromatographymass spectrometry gcms or direct aqueous injection gcms. Oil and grease and silica geltreated nhexane extractable material sgthem. National service center for environmental publications nscep search. Nonpolar material by extraction and gravimetry, describes the determination of oil and grease from liquid typically water samples. Dilute and reanalyze samples with concentrations exceeding the range of the calibration curve. The laboratory is responsible for maintaining a safe work environment and a current awareness file of osha regulations regarding the safe. The opr standard must be spiked with hexadecanestearic acid solution prepared from a separate source than the solution used for matrix spikes. Epa method 1664aextraction of oil and grease from water. Nonpolar material is the only approved epa method for the measurement of oil and grease.
Epa is approving method 1664, revision a, for use under the clean water act and as an. Method 1664, oil and grease, revision a hydroflotech. Method 1664 used normal hexane nhexane in place of cfc1. Instructions for epa method 1664a bottle requirements clear 1 l with h 2 so 4 sampling location the location code that is identified on the water systems sampling plan. Method 1664 is a performancebased method applicable to aqueous matrices that requires the use of nhexane as the extraction solvent and gravimetry as the determinative technique. Final methodrevision a print version pdf 160 k, 28 pages. Oil and grease and nonpolar material using solvent extraction and gravimetry. Learn more about acacia rigidula uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain acacia rigidula. Oil and grease reflects the material extracted by nhexane as that which is being measured using method 1664 and. View actual epa method 16b pdf file epa method 16b. Method 1663 differentiation of diesel and crude oil by gcfid 1. Alternative extraction and concentration techniques are allowed, provided that all performance specifications are met.
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