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<br />percent !nude ~ta±+leutien <br />7.2 It the saapla rill obviously yield no free liquid vhan sub~eeced <br />to praanun filtraeien (j,~,A" 100 percent solid), raiSh out a <br />reprasentativa subaample (100 ~raa minisuv) and proceed co Seep 7.5. <br />7.3 I! the saaple la liquid or mulciphaaic, liquid/solid separation <br />la required. 1'hia imrolwa the filtration device diaewsed in Seap 4.3, <br />and is outlined in Steps 7.3.1 to 7.3.6. <br />7.3.1 Pre•reiih the filter and the container rhieh rill receive <br />the lilerate. Asseabl• filter holder and liltar tollorins the <br />ssnufaeturer'a instructions. place the filter on cha suppose :eaten and <br />ascots. Acid rash the filtat it evaluatitfs the mobility of metals (see <br />Seap 6.6). <br />7.3.2 Weish out a repraaaneative subsanple (100 s ainiaua) and <br />record reisht. <br />7.3.7 Allot slurries co stand co permit the solid pMse to <br />settle. Saaplea that settle slorly say be eenerifuied prior eo filtration. <br />7.3.4 'Iranaiec the mate saapl• to the filter holder. <br />~~: I! saaple natesial hu obviously adhered to eq eootaiaes <br />used to transfer the saapla to the lileraeion apparatus, <br />detaralne the rei=ht of this rasidw and subtract it troa <br />the supla widhe determined in Seep 7.3.2 ee detaraieu <br />the reijht of the sample r61ch rill be lilterad. <br />Gradually apply vacuva or aenela praasuse of 1.10 psi, until air or <br />psessurizia~ tas sove• ehrouilt the liltar. I! this point La net reached <br />under 10 psi, and i! no additional liquid has pauad ehrou6lt the filtat in <br />any 2 minute interval, slorly inereas• the pressure in 10 psi Locreaancs co <br />a ousiav of SO psi. Attar each incrwntal increase of 10 psi, i! cha <br />prassurisia< <u has not aowd throush cha filter, and i! no additional <br />liquid has passed ehrou~h the filter in any 2 minute interval, proceed eo <br />the na:t 10 psi inerwne. Wham the preasurizinf fas begins eo move <br />thsou~h cha liltar, or rhea liquid floc has teased ae SO psi (L,y" does <br />not resole in aaq additional Lilerata riehia anq 2 smuts period), stop the <br />filtratios. <br />~j~: Instaneanaow application of hiSh pressure can de6rade the <br />jlasa fiber filter and may eaw• premature pluuint. <br />7.S.S 'Iha material in the filter holder !a defined a. the solid <br />phase of the aaaple, and,ehe filtrate is defined as cha liquid phase. <br />~~: SoN aaaplaa, such as oily tastes and soma paint tastes, <br />rill obviously contain soma saearial rhleh appears eo b• a <br />liquid, but even attar applying vaeuua or pressure <br />filtration, as outlined in Step 7.3.4, this siscerial may <br />not filter. If chin is the ease, the ouesrial rithin the <br />filtration device is defined as a solid, and is carried <br />chrouslt the extraction as s solid. Do not replace the <br />original filter rich a fresh filter under any <br />eiscuaataneea. Us• only one filter. <br />- 6 <br />