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I <br /> 22092365240 _ A Eh�J I RO SFV INC 082 P03 N&) 17 '92 12:21 <br /> ti ,� IL1 12963773 P.03 <br /> 4.0 APPARATUS AND MA1'SRIALS <br /> 4.1pp <br /> Extractiun a a tua: Sox#tlet, i <br /> 4.2 An4lytical Bala 'e. <br /> 4,3 Vacuum pump► or me other vacuum� source. <br /> 4.4 Extraction thi et filter papeI <br /> 4•5 Glass wool or s 11 glass bead$ to fill thimble. <br /> 4.4 Grease free Batt n: Extract nonabsorbent cotton with solvent. <br /> 4.1 Bearker: 150-mL. <br /> 4.8 PH indicator to eteraiine acidity. <br /> 4.9 Porcelain mortar <br /> 4.10 C*traction flash 150-ML. <br /> 4.11 <br /> Distill-iflg appar tus: Waterbath at 70°C. <br /> 4.12 Desiccator.6.0 p ENTS <br /> S-1 Reagent grade c omicals shall be used in all tests. Unless <br /> atherlvise Indicated* it is i #ended that all reagents shall conform to the <br /> specifications of the Committ on Analytical Reager3ts of the Rtaterfican Chemical <br /> , <br /> SaCiety, where such specifica ions ar* a,va,ilabla. Other grades may be psed� <br /> provided it is first ascertain that, the ftageitt is Of sctfficiantly high parity <br /> to permit its use without les ntng the accuracy of the determination. <br /> S•S Reagfnt water. 11 references to water in this method refer to <br /> reagent water, as defined in apter One. l <br /> 5.3 COncentrated Cyd 'chloric acid <br /> 5.4 Magnesium sulfat monohydrate: Prepare Mg5O ., Had by spreading a <br /> thin layer in a, dish and dryin ' in an oven at 15440 over�Aght. <br /> 5.5 Sodium i sulfate, g anusart anhydrous (Na 5O4): Purify by heating at <br /> 404• for 4 hours in a sltalio tray or by preclea,tt ng the sodium sulfate with <br /> methyierte chloride, if tete sod m sulfate is pr&lelned with methylene chloride, <br /> a method blank must be analyzed demonstrating that there is no interference from <br /> the sodium sulfate. � <br /> 9071A - Z <br /> . , Ravi siart 1 <br /> November 1990 <br />