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6 2'% <br /> H <br /> Y <br /> METHOD 3550 <br /> SONICATION EXTRACTION <br /> 1.0 SCOPE AND APPLICATION <br /> i.l Method 3550 is a procedure for extracting non-volatile and semi- <br /> volatile organic compounds from solids such as :oils, sludges, <br /> and wastes. The sonication process ensures in�:iinate contact of <br /> the sample matrix with the extraction solvent. <br /> 1.2 The method is divided into two sections, based on the expected <br /> concentration of organics in the iamplo, The low concentration <br /> method (ind:,iidual organic components of <20 , g/kg) uses <br /> larger sample size and a more rigorous extraction procedure <br /> (lower concentrations are more difficult to extract) . The high <br /> concentration method (individual organic components of ^.20 <br /> mg/kg) is muc« simpler and therefore faster. <br /> 1.3 It is highly recommended that the extracts be cleaned up prior <br /> to analyt.is. See Cleanup, Section 4.2.2 of Chapter Four, for <br /> applicable methods. <br /> 2.0 SUMMARY OF METHOD <br /> 2.1 Low concentration method: A 30-g sample is mixed with an' vdrous <br /> sodium sulfate �-o form a free-flowing puwder. This is solvent <br /> extracted three times using sonication. The extract is <br /> separated from the sample by vacuum filtration or <br /> centrifugation. The extract is ready for cleanup and/or <br /> analysis following concentration. <br /> 2.2 Hi_E± concentration method: a 2-g sample is mixed with anhydrous <br /> sodium sulfate to form a free-fluwing powder. This is solvent <br /> extracted once using sonication. A portion of the extract is <br /> removed for cleanup and/or analysis. <br />' 3.0 INTERFERENCES <br /> 3.1 Refer to Method 3500. <br /> 4.0 APPARATUS AND MATERIALS <br /> 4.1 Apparatus for rindina: If the sample will not pass through a <br /> 1-mm standard sieve o:: cannot be extruded through a 1-mm <br /> opening, it should be processed into a homogeneous sample that <br /> meets these requirem,:nts. Fisher mortar Model 155 Grinder, <br /> Fisher Scientific Co. , Catalogue Number 8-323, or an equivalent <br /> brand and model, is recommended for sample processing, This <br /> grinder should handle most solid samples, except gummy, fibrous, <br /> or oily materials <br />