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4.0 AFlAdA'LOS AND !U~*a e <br />4.1 agitatien appasatw - an aeeepcable agitation apparatus is one <br />which is ea}able o! rotatinS the extrucion vassal in an end-over•end <br />las6lon st 30 t 2 rpm (see FlSuse 2). Suitable devices known co EPA are <br />ideatitied !a Sable 2. <br />4.2 Extrution vassal aeeaptable extraction vessels aza thorn that <br />ara liatad belor: <br />4.2.1 faro Neadspaea Extraction Vassal (ZNI) - Shia Mviee !s <br />!or we only rMn the supla is be1nS tested !or the sabiliry of wlacile <br />conscitwnta (saa Sable 1). '!he Z7lE La an extraction vessel that allore <br />!or liquid/solid separaclon within the davlee and which eileeti~ely <br />psecludea headapaee (u dapieted La FLSure 3). Shia typo of wasel allova <br />for inieial liquid/solid separation, exeraeeion, and linal extract <br />liltration riehout havinS co open the vassal (saa Step 4.3.1). Sheae <br />veesela shall haw an internal volume o! S00 to 600 al sad be equipped to <br />aecosaodace a 90-sst liltss. Suitable Z1iL dwlces known to EPA ara <br />idantitied in Sable 3. Shaw 4viees eonuia viton 0-ring rhich should be <br />replaced lsegwnely. For the ZNS to be aeeapcable Lor we, the piston <br />within the 21lS should be able to be sowed with approxiaately 1S psi or <br />lass. It ie cabs soya praseura co sxrw ehr pigeon, cha 0-riaSs la the <br />davits should ba raplacad. It this.does not eolw the preblu, the 2!R is <br />unaeeepeable tos 1312 analyses and the aanututurer should be eeneuead. <br />She 27R should be checked attar awry extraction. IL the deviea eantaina a <br />built-in pressure pup , pressurise the device eo SO psi, alloy le co stand <br />unattended for 1 hour, and reehaek the pressure. It the device doss not <br />haw a built-in pressure =sup , pressurise the device ee SO pal. subs~erSe <br />!t in rater and cheek tos the presence o! air bubbles eseaplnS Qroa eery o! <br />the tittinp. It pressure Ls loan, ehaek all tittinp and ituspeict and <br />replace 0-riap , it naeessary. Retaae the device. I! leakaSe problesu <br />cannot be solved, the asaututuser should be contacted. <br />4.2.2 Sotela E:trution Vessel Wham the saaple is bainS <br />evaluated !or ocher than wlacila contaainants, an axtrueion wesal that <br />does not preclude haadapaea (e•e-, a 2•liter beetle) is wed. Suitable <br />extrusion wasels include bottles sage lro~ variow aaeerials, dependinS <br />on the contafinand to b• analysed and the nature of the waste (see Step <br />4.3.3). It is reoosssanded that borosilieate Slur bottles be wad over <br />ochss typal a! Slaaa, especially when inorSanics are eo be lervestLSated. <br />bottles ara mailable ire. a nunbar of laboratory suppliers. When chic <br />type of esesaatiea vaaael is wed, cha tiltraeion device discwaad in Step <br />4.3.2 is wed tos inieial liquid/solid separasion and linal excrete <br />lilerseion. <br />4.2.3 Sole ZNEs we Su prasaure eo actuate the 2]tE p~iseon, <br />while others wa shchanlcal pressure (saa Sable 3). Whereas the wlatiles <br />psotedure (saa Seep 7.7) ratans co pounds•per-square inch (psi), for the <br />awehaaleally utwced piston, the pressure applied Ls aeaaured !n <br />tergw-inch-pounds. Ratan to cha sanulaecurer's inatructioeu as to the <br />proper conversion. <br />4.3 FLltraelon devices - Ie is reeomended that all filtrations ba <br />pestorsrd Ln a hood. <br />2 <br />