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- I 20921DS5240 ti, ENU I RO SRU I NC: 082 PO4 HOV 117 '92 12:22 _ — _"� �� ..J .,� �. uv. .•..iln..iiirl� i� SGG7J] IU r1YJ4 7.2.I Remove solids and grind to fine powder in a mortar, 7.2.1. Add the pvwder'to the paper extraci ion thimble. 7.2.1. Wipe beaker and mortar with pieces of filter paper moistene With solvent and add to thimble. 7.2.1, fill vnimble with glass +vol (or glass beads). 7.2.2 Sed#me t/Soil Samples 7,2.2. : Decant aM discard any water l gayer on a sediment sample. Stix mplo thoroughly, especially composited samples. Discard any fo 9gn ObJects s4ch as sticks, leaves, and rocks. 7.2.2• '610d 10 g of the solid sample of known dry weight fracti o 'With 10 R of 'anhydrous Sodium sulfate, and place in ars extractio thimbla. The extraction thimble mast drain freely for the duratio of the extraction period. 7.3 Extraetiom 7,3, 1 Extrac in Soxhlet apparatus using at a Fate of 20 cycles r for 4 hr. 7.3.2 using ease-free cotton, filter, the extract into a pre- weighed 250-mL -boi1iog task. Use gloves to avoid adding fingerprints to r the flask. 7.3.3 Rinse ask and cotton with solvent. 7,3.4 COMCt Aha bollift flask to , the distilling head and evaporate the solvent b immersing thilower half of the flask in water at 700C. Collect the sol Int for reusei. A.' sol vent blank should accompany each, sett of Samples... � 7.3:5 When th So, ,C in the- distilling sti 114 rag headr'eaOhes Sa C or the flask appears dr :, remove the, 4istilling #read. To remove solvent vapor, sweep out the fl �sk for 16' sac'-with air by inserting a glass tube that is conngtted to a acuum sourte.l Immediately remove the flash from the beat source and w pe the outside to remove excess moisture and fingerprints. weigh. 7.3.6 Cool th boiling flask in a desiccator for 30 min Brad 7.3•17' calculat Oil and grease as a percentage of the total dry selids, Generally: ?i of Oil and grease Of wet Solids (S) x dry weight friction I ' e071A Revision, I November 1990