WebApr 29, 2003 · A common biochemical method to analyze the domain organization of membranes is extraction with mild detergents like Triton X-100 (Triton). Although detergent treatment disrupts most lipid–lipid interactions, a minor fraction of cell membranes is preserved and can be isolated as detergent-resistant membranes (DRMs). Web3.3 The base-neutral extraction may cause significantly reduced recovery of phenol, 2-methylphenol, and 2,4-dimethylphenol. The analyst must recognize that results obtained under these conditions are minimum concentrations. 3.4 The packed gas chromatographic columns recommended for the basic fraction may
Method 1664, Revision B: n-Hexane Extractable …
WebMethod 1664 is a performance-based method applicable to aqueous matrices that requires the use of n-hexane as the extraction solvent and gravimetry as the determinative technique. Alternative extraction and … Webspectrum of the resulting extract was measured using a long pathlength liquid cell. Once the Montreal Protocol went into effect in 1989, the EPA abandoned the Freon extraction infrared method in favor of an n-hexane extraction mass determination method (EPA 1664).4 Although this eliminated the use of CFC solvents, it created four new issues: 1. slow pc scan free
Method 1664 : N-Hexane Extractable Material (HEM) and …
WebBrief Method Summary. A 1-L sample is acidified and serially extracted three times with n-hexane in a separatory funnel. The extract is dried over sodium sulfate. The solvent is … WebThe measurement of the extracted material is done using a balance in regulatory methods US EPA 1664, ISO 11349 and Standard Methods 5520G, providing a simple and inexpensive detection step.3,4,5 A further silica-gel treatment can be used to isolate the nonpolar material in the n-hexane extract. WebEPA 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 … slow pdf files