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u <br /> 209296_5240_ . . _ T�.H EhI,.IRO' ��P.J INcv I 082 P02 hl�G '17 '�2 12:20 <br /> ` METHOD 9071A <br /> OIL M-M 119A NTH 1 00 RA Fs <br /> 1.0 SCOPE AND APPLICATION <br /> 1 .+ Nothod 4071 is used to recover low levo-Is of o i 1 and gnasa (10 <br /> mg/L) by chemically drying wet sludge sample and then. extracting via the <br /> 'Soxh et apparatus. <br /> 1.2 Method 4071 1 used when ralatively polart heavy petroleum <br /> fractions are present, or w n the levels pf nonvolatile greases challenge the <br /> soltubil1ty limit of the sol At <br /> 1.3 Specifically, ethod 9011 is suitable for biological lipids} <br /> mineral hydrocarbons ands a ihdu,strial astewaters. <br /> 1.4 Method 9071 i at recommeinded for measurement of low-boiling <br /> fractions that volatilize' a 'temperatures 66low 70•C. . <br /> 2.0 SUMMARY OF 11ET90D <br /> 2.1 A 20-g saVl e f wat sludge with a' k;c'w n dry-solids content i s <br /> acidified to pH 2.0 -with 0. ml. concentrated 140 . . <br /> 2.2 Magrsesium sulf to monohydrate will combine with 7S% of its -owns <br /> weight in water in fos�ning SO4 7K20 and is used to dry t.the acidified- sludge <br /> sample. <br /> 2.3 Anhydrous sodi m sul fa'to is used to #ry sampl as ,of soil and <br /> sediment. � <br /> 2.4' After 4dryin tha oil �a d greased are extracted i <br /> using the Soxh+let apparatus <br /> . <br /> h <br /> i <br /> 3,4 <br /> �TIERFERENCES <br /> 3..1 The method 1s ntirely empir�ital , and duplicate results can be <br /> obtained chly by strict adh ence to all d.tails pf the processes. <br /> 3.2 The rate andel t e of extraction in the Soxhiet apparatus must be. <br /> axactly as ditected because f varying solubilities of the different +creases. <br /> 3.3 The length of time required for drying and Cooling extracted <br /> Material must be constant. <br /> , <br /> 3.4 A gradual inc se in weight may result due to the absorption Of. <br /> oxygen; a. gradual 1 os_s of we ght may resin t due to volatilization. <br /> 'Rep'la'cement solvont wi be specified in a forthcoming regulation. <br /> 9071A -1 1 Revision I <br /> Navetnr I990 <br /> r :dw <br />