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analyses, it is recassasnded that sore chaa one extraction be perlorad and <br />the esuaats be eaebiaed and than aliquoced for analysip. <br />7.f.1 Reish out a representative subaasryle of the saaple <br />(desiputad as the second sample in Step 6.2) and eranater eo eha !!Lear <br />holder extractor weasel. <br />7.6.2 Determine eha appropriate extraction fluid to use: <br />Por soils, i! the saaple is from a slce chat is east of the <br />liississippl Aiwr, exesaeeion fluid el should be used. I! the sample is <br />from a site that !a vest o! the Mississippi Rive;, extraction fluid e2 <br />should be weed. <br />Fos wastes and vaaterater, extrution fluid •1 should be used. <br />Fes cyanide-eontainin~ wastes and/or soils, extraction !laid M3 <br />(reapnt rater) awe be used because leaehini of cyanide-conuinls-R samples <br />under acidic conditions say rssule in the formation o! hydrojen cyanide <br />~aa. <br />7.6.3 2t eha waste contains <O.S percent dry solids (Step 7.4.3), the <br />liquid portion o! the casts, attar lileration, is defined u the 1312 <br />eseraee. Therefore, eaou;h of eha sample should be !!!eared ao clue eha <br />aaoisnt o! lSltered liquid will support all o! the amalyses required of rha <br />1312 estraet. For wastes containing >0.3 pareant dry solids (dap 7.4.3), <br />use the percent solids Lnforaeion obalaed in Sap 7.4.1 a deKermiw eha <br />optima sale size (100 =ran mining) far lilezation. Fswuph solids <br />should be pneraced by lilerselon co support the analyses eo be perlorad <br />on eha 1312 extract. <br />7.6.3.1 Allow slurries co stand to pewit the solid phase to <br />rattle. Rastas chat settle alarly may be eenesilused prior co lileration. <br />Use eentritu~stion only u as aid w lileration. If eha cease la <br />cenerilu6ed, the liquid should be decanted and filtered tollowd by <br />filtration o! eha solid portion o! the mate chrouRlt the sea filtration <br />syseu. <br />7.6.3.2 Quantitatively traaafer the vests aaaple (liquid and <br />solid phuea) CO t!M filar holder (see Seep 4.3.2). Spread the vacs <br />sample evenly over eho surface o[ the !!leer. I! lileration o! the waste <br />ac 4•C redtiema thm amame o! expressed liquid over what would be expressed <br />at woos ts~aratura, than alloy eha sas~ple to ran up to coos cesRerature <br />in eha daviam bolore tilterins. <br />~S: I! rota aaeerial (>1 pereeoe of the oriiinal sample <br />rei8ht) has obviously adhered co the container used to <br />cranaler the sample co the filcraelon apparatus, determine <br />the vel~lst o! this reaidw and subtract it frog the sample <br />veiilte determined in Seep 7.6.1. co determine the vei;he <br />o! eha waste sample chat will be filtered. <br />Gradually apply vacuua or Gentle pressure o! L-LO pal, until air <br />or prasaurizin< <as sower chrou`It the filter. I! Chia point i! not reached <br />under LO psi, and i! no additional liquid has puled chsousl- the filter in <br />any 2-minute interval, slowly increase the pressure in 10 pa! inereanes to <br />aasimua of SO psi. Attar each incremental increase of LO psi, it the <br />e <br />