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al(G[reaMupua 4mPE 11"'A'Al MNWrppa ww..mmmamPnverse"nnrom ww..rnromaroyraenyonan.rom NmManNi t<4(xGTn wlm[A Wu,[n.147
<br /> Our objective was to Jet each laboratory -
<br /> relece and apply in own preferred method.
<br /> We chose not ro dicu[c specific method
<br /> procedures to be followed and instead exicd Target NWyte Repliate1 PepliUle3 Nei 3 Mean RSD I%I attention Replicate nations Mean RSO11y Replicate Repliote2 Replace Mean ISO(l
<br /> upon the laboratories to apply[heir experl Sample 401.1
<br /> ince with oxygena[a and[heir bat avail- MTBE IA 1.4 IA 1 d 0 0.91 0.98 1.0 0.95 4.9 1.0 1.1 1.1 1.1 5.4
<br /> able purgicand-trap technology as achieve ort-Butyl alcohol but NO ND NO NO NO NO NO NO
<br /> the target practical quan[ia[ion limits and 2-Propanol NO NO ND NO NO NO NO NO NO
<br /> Acetone NO NO ND NO NO NO NO NO NO
<br /> the precision and accuracy,objectives for the MTBE d,hurmgare)t IV% 112% IQ% NAI NA NA 79.9% 90.5% 97.6%
<br /> project in sarnples obtained from rhe rite of tortui co.. :rn
<br /> .9,,, et. caw ret 1 I I 132% 82.8% 854%
<br /> comm.in this sense.our study was comic 'Sample 4014 , ' -
<br /> rent with he p�imam-baud exciasurc- TBE 491 493 486 490 074 i 1 �' 11"� �70 480 473 1.2
<br /> such,M. pprowchr relation
<br /> to method rt-Butyl alcohol NO ND NO 20 20 20 20.0 OA
<br /> currently being establishedby EPA (ace P µTenor ND Nero NO .i,.. ''. t No No NO
<br /> hupd2www.epMgov/epaoawer/haawalte/tat/ cetone ND :VD S G t ,ErkvNe ,f" t NO NO ND
<br /> pbmu.hun) We diatd only quality,ton MTBEU3burroght)t 97% 97W +g% 168% 149%
<br /> [iter regoiremen[s and apprgpna[e rprking hrt BvtYl alcohol Eoro,Nte); 98% 97 '
<br /> %, n, x%, 108%; 111%
<br /> conantn[iom and techniques.Our overall Sample cavi
<br /> objective was[o compare inualabonrory MTBE 3010 2860 2960 no 2.6 25M 28M 2900 27M 7.6 2200 2760 no 2600 13
<br /> rauh and choose the most suiublc halon- len-Butyl alcohol IIs MAO RAN NAa 69a NAa 70 BO 60 70 14
<br /> 2-Propanol NM NAA NAa NAa li NAa NO NO NO
<br /> tory for the demonstration. Acetone NDa NAa MAX NAa NDN NAa NO NO NO
<br /> MTBE-d,waregati 110% 103% 102% NA NA NA 911% 76.9% 132%
<br /> Experimental NM-Bmyl alahani lactam li 95% 93% 92% 1 1 1 112% 119% in%
<br /> Sampler were collected from four sepaute
<br /> well locations as the Port Humane site thin
<br /> were of interest for the Supuliand Innevast
<br /> -
<br /> tive Technology Evaluation program vat-
<br /> ment Technology demonstration.Sample NO NO
<br /> H-1 war collected near the source of the % . 05%,
<br /> plume(the NEX gas snation)in an aro
<br /> Affected by freephare Boating hydroa- •ARrwalbmaprs,aakamolmboprmm Pw 11 W,anptbrwrcgaareroawka aMkrw
<br /> berm.Sample CWT'was inflected davingra- strand in pwcene
<br /> client of the sours arra in the hart of the t No=net deamea.
<br /> t 5urrggaa interval alas rot meet pe9him accuracy aheria(75-125%heronry)are in bole.
<br /> MTBE plume.Sample 401-3 was collard I NA-not r alma.
<br /> 6mher downgndient in the MTBE plural I rertaual akonolas was mea as an intnal swam b2 wooden,r rather men in a sumouate.sok
<br /> and sample 401-1 was collected near the tree lM'eata amples in wha,the lnterelnaMara remrery was owl a prgoon everaim tial of
<br /> 7s-
<br /> rum,boun r25%.
<br /> P �Y tT7 kmatwraaNzae toed alae three repliota et bwerdilu['wn easier bwat posslbk patkal
<br /> Each sample was composi¢d quickly awboactia Rmin area quantitate aaMes other than al
<br /> before being split into three aliquot for '•Ni9M1 noes of ITElt hoster man 1"call were repartee by the bbwaader for this stook.
<br /> submission to the duet prequalified liberal
<br /> writs.Af[a receipt.the laboratories each
<br /> performed the following stria of[at on if any MTBE but otherwise rcprosel demonstrate cut their low-level method with EPA SW-846 Methods 5030B and Laboratory M Iabohi[ory Y performed a linked to A model 5973 mart rpex ronbl
<br /> the nmples as part of the dean motion of live ofaine conditions)for low-level spik- reporting limit could be mnaidad a prat- 82608.Each sample was purged at roam modified version of Method 50308 that WI from Agilext Tmhnoloom). //
<br /> method applicability. ing by each laboratory.The laboratories tial practical limit rnher than a su[ish- temperature using a 5-mL purge volume. use a 10-mL sample purge volume and a laboratory L•Laboratory Z arul)a(
<br /> •Each sample was screened to sem An were asked to perform a minimum of d method detection limit).The practical The purge-and-tap device comprised a 40'C purge temperature.A purge time of preficicng study sampler in accords
<br /> appropriate dilution Tutor for optimal three low-Icel spike anilyus(MTBE, quantitation limit requirement were stated Varian Archon-EST autosampler and a 11 min was used,followed by a 2-min chip with EPA Method 524.2 for drinkingwaar.
<br /> qumdmdon of the targe[analytes pia Mor-buryl alcohol.2-propanol,and am above. Tekmas 3000 concentrator (Tekmar- desorb time and a 15-min hall at 180 Each sample was purged at room tropical
<br /> sent.Each sample rhim was analyzed in tone)on this such.,wherein the spiking After receipt of the result from the Dammam.Mason,Ohio)equipped with a °C.As who out for laboratory X,laboratory lure using a 25-mL purge volume.The
<br /> triplicate at the selected dilution factor conanma tom were a[or mar the Baird method applicability stul we performed a Supelco Vocal K 3000 imp(Carbopack Y applied its standard method for volmile purgeand-tnp device comprised a Tekmar
<br /> (ser Table 1). practical quarnalion limit for the tech- raw data review of all laboratory dart. B/Carboxen,Bellefonte,Pennsylvania).A organic compound analysis of water Al 200022016 auronmpler with a Tekmar
<br /> • Matrix rplk,orel spike duplicate oology demonuratNow(sec Table III). Included in this renew weer sondard qual- purge time of I I min was used,followed by ples by GC-MS:purge-and-trap protocols Purge Trap K(Carbopack B/Carbwel
<br /> analyses were performed can each of the In association with the above too,we icy control checks for purge-and-top A 3}min desorb time(240°C)and an 8-min and other method parameters were not The purge time was I I min,followed by a
<br /> four snnpla local to gmrearc real asked the laboratories to use oxygenated Gi methods,such as holding times, bakeom(260.1 Nether the purge-and- modified specifically for analysis of wry- 6-hum decal time(250'C)and an 8-m6n
<br /> specific position and accuracy alcohol surrogates or inertial standards or monitor GC-MS immanent coning and calibration, tap no the analysis method was modifid genata. The ample analysis system bakrom(260'1 Again,neither the purge-
<br /> tion for all the urger analyia.Spike ev- recovery in etch sample and spike analytd. surrogate compound recoveries, matrix or optimized fm analysis of the oxygenated included an OI DPM16 purging normam- and-map nor the analysis method was mod-
<br /> ch woe adjusted a darned appropriate The labonmria mpondd by using data- spike=6.spike hall and low-spikc urger analyte.Sample coal was coo- pler and an 014560 preconcenmmr(both ifid or optimized for analysis of the ozy-
<br /> by the labora[oria for urger analyte con- aced analogues of MTBE or ameta ryl al recoveries,relative prosent differences,nope Picard ming a DB-VRX cultural on a model from OI Analytic,College Scotian,Taal groused urger analytes.The sample"you
<br /> laminations and sample dilution (ser hot in this capacity The labonroria also liare results,[aria compound iden[ifia- 5890 gas chm mmgnph linked to a model with a combination (Tenex-silica gel- was completed using an HP-624 column
<br /> Table 11). were required to ensure chat drtir oral tion and cho n[i[ation,and had blanke. 5971 mass spectrom ler(ill from All CMS)trap.The analysis was performed and a model 5890 aria II gu chrotna[o-
<br /> •Additional amplea were collected from calibration curves included their target Laboratory 10 Laboratory X analysed the 1.1mas ogies,Wilmington,Delaware). using a model 6850 ger chromatograph graph linked to a model 5971 mass aper-
<br /> Well 401-1(known to contain very little practical quanrna[ion limit (that is, to proficiency study sampler in accordance equipped with a DB-VRX column and tromchr(ill from Agilem Technologies).
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