NYC-WTC_000208957

NYC 9/1 IPubli-e Portal Documenl

Jun 10 02 02:05p ' FEB-07-20ed 17 = 4^ Airtek Environmental Corp (212 I7G8-0759 auicMiiriv LJiB-3 --- “ j P- B D575S that the fillers are centered and pulled (fee without air 10.4,11 Apply vacuum to the flask and drtw the mlsiurs bubbles. Any irresulariiies on the filter surface requires tie through the Slur. discard of that filter. After die filter has been seated propaly, jO.4.12 Discard the pipette. replace the found and teseai it with the tape. Return the 10.4.13 Disassemble die fiiUriog unit and carefuHy re. fiask to attno^heric pressure. move the ample .fte wnth fine twccacrs P, U). Place the 10,4, j.2 If » gUw* nicratian unit is used, place s 5 jam pore compleisd temple .'iltcr oarticlt ride up, into a predcantd. size MCE jtacbns filter) on tte gJajs rrit surfwe, the labeled, disposable, plastic ^psstti dssh (7.44) or other rimiJar tiitef witb «nicte-fr«e water. «id place 40 -MCE or PC four contaiaer. um pore stw5 on top of the bseSang Slier. A| 10.4.14 la order to ensure that an oprisuJly-badcd filter vecuutn. ensufing that the fiitcra on eeeterEd and pniil flat is obuloed, it is reconimeiaded that filters be prepared from without air bubbles. Replace the .Gillen if any irregul tcvoral difTereai allquoci of the dust flispearioo. For this are seed on ths filter tur&ce. Before ffloation of each sf aria of filttss, it is recoentsended that the volume of och ample aliquots. prOjiare a blank filter by fillration of 54 mt aiiduot of the original stispcarioa be a factor of five higher of particie-uee water. If aliquots of dis same lampte are tiua the previous one. U.' the fiften arc propored in order of filtered in order of inaeasasg coocatiaaon. Che glass idtra- iaereulng alUuot volume, ail of the filters for one sample 1100 unit need not be washed btiween filuaiioa. (After can be prepare} using one plastte disposable filtratioB unit. compfeuqn of the (ihrttica. do not allo* she Siimtion found Or witiiQui cleaning of glass filt’acoa equipment between assembly co dry because coottminatfon is thea more diincult individual filtraaoa. Before withdftvtstl of each aliquot from to teiaove. Wash any readual suspeariOQ ftom the flltkiion the sample, shake the ruspenrioa without additiooai assembly by holding it under a 5o* of water, thea rub the sonificarioo and allow to rest for 2 min. suriace with a dean pa£^ towd soaked ia a detent IO.4,U There »e many practical methods for dtying MCE SItera. The foUewing are two exampiea that cuo be used: solution. Repeat the clttfting operatiort, Ud then rink two (7) dry MCE filters for at least 12 h (over desiccant) io aa times in particJc-fntc water. airtight cabinet-type desirouof (7.2lk (2} to shotwn the 10.4.6 With the flask at atmospheric pressute, add 0 ml drying dme (if derired), remove a plug of the damp filter and of porride-ftee water into the funaeL Cover the filler ibnnd arisch it to 4 glass slide (7.19) os doeribed in 12.1.2 and with Its plastic cover if the disposable filtering unit is used. I2,l.j. Place ths riidc with a Site: plug or filter plugs (up to 10.4.7 BniOy hand shake (3 t) the rapptsd bottle «ich the eight plugs cas be attached co one slide) on a bed Of utnpie suspension, thea place it is & tablewp ultmci tcbath daiecant. in the dericcator for I h. (7.13) and sonicate for 3.3 min. Mainuin the water e*el ia 10.4.16 PC filters do not require lengthy drying before ihe sonicaior at Ute same height as the solution la cample prepartWia, but shall be placed in a dcacator for ax least 30 bottle. The ultrasonic both shall be calibrated as dese Ibsdio min before preparation. 20.3. The ultraaeaio bath must be operated st equi ibnum le.i Prepexe TEM spedmens foom small senions of each itajpemiure. After jonicariog, return the sanpic bo«l I to the dried filtof using the appropriaie dinxt transfer potparotion work au&ce of the HEFA hoed. Preparatioo 10.4.« medud. throuch 10.4.14 shall be earned out in this hood. (0.4.8 Shake the suspension lithiiy by band for J 5, theu II. Stuks let it res) for 2.0 min to allow Utge porticla to lett^ to the. I I.t Prepare sample blanks fimt include both e process bottom of ihc bottle or final to the surfoee. blank (50 aiL of panide-Inse waser) for each set of samples 10.4.9 Esnatace the amount af liQutd to be wit^rawn to miyzed and eoe ucu-sed She; Gmm each aew box of sample produce an adequate filter preporasoa. Expec^lee has filters (MCE or PC) used ia the labotarory. If glass fiiterios shown that a light stoiiung of th^Slier surface wiu;yield » uaits ore used, prepare and analyze a procta blaak each lime ' suitable pfwarttica for analysis. Filter at lease 1.0 tsL, but ths Sltenoj uoit is cicsaed. Blanks will be ecnsideced no non than half the total vohuae If after exanii axwo in eentamisated, if after analysis, they am shown to con'taio the TSM. the siaattest wlumj ateajured (1.0 utU (7.13} mote (baa 53 ariicstot aructurts per square jeilliinetm. This yicldj la overtoaded sample, then perform additio^ serial generally eotrsspoads to three or four aaboios sBWtuta ; ailuUDOs of the sutpeasioa. If it is aedmaied that les than found in ten grid opeiiiagt- The source cf the eaatarsuainon 1.0 nL ofsolution baa to ba fijtertal because of the ^euaty of must be found before any further analysis can be pcrftwined. the suspension, perfona a serial diludon. fUject samples that were procesaed along with ihc coEsaxai- 10.4.5,; Lfsttial tjliucioas ire required, repeat ip 10.4.3 naied blanks sM prepare new samples after the aurcs of the sefore liM serial diJurian portion U taicen Do net sonicate coaousinatioa is fouisd. the _ pri^'saJ ioluoon or any. serial dilutions. 7 I recam- . 112 Prepare field blanks which are iocludeti with sample mestded procedure for a serial dilution is to mix 10 tot of the sets in the same moaner as the samples, to tat for contami­ sample solution with 90 sit of patticle-lree tvaierfo a cseia nation during the socopiiog. shipping, handling, and prrpe- jampie bottle to obtain a 1:10 sola] diluaoa. Fatlow good radoo steps of the aicibod. laboratory practiees when peribiwr^ dilutions. 12. TE.M Speejmeo PnpatatiCB of Mixed Cdlolace Ester ! 0.4.10 Insert 4 new dispossble Qiper.4 halft*^ Into the ^fCE) rdters sample juepension and withdraw a portion. Avoid pipetting Nora I—Use of either me icciooc er the eianeUixUbriMiiudr. ‘ any ofthe large flcaring or anled parades. U ncav^ the filler aesne icm nacaod is acetettWt, lunnei and dispense mixture flrom die pipexic into ths water i» ths fuanei. 12.1 .^ceicr.f fusing ^/ethaci-

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