Document 9LqXQaGr3RRJ6Y9jOaG6bDaXD

INTERNAL CORRESPONDENCE ct w* FROM R. T. Cheng TO Ed Lu SUBJECT Industrial Hygiene Instruments IN REPLY refer to RTC 74:213 DATE 12/9/74 Instead of purchasing miniature personal sampling pumps for taking 8-hour VCM samples with small charcoal tubes, an alternative is to sample the air with standard size personal sampling pump with large size charcoal absorption tubes which your laboratory can make. The advantages of the standard size personal sampling pumps are that you can use those pumps for dust sampling, midget impinger samplings, and many other types of operations which a miniature sampling pump is incapable of. Attached is an operation manual from General Tire & Rubber Company and Dow Chemical Company on how to prepare the large size charcoal absorption tubes, and how to run the vinyl chloride samples. Dr. J. 0. Jackson will send you a letter recommending the type of gas chromato graph and other accessories to be purchased for VCM sampling and analysis. R. T. Cheng RTC:nm Attachment cc: R. L. Gibson, M. D., w/o attach. 0. 0. Jackson, with attach. H. E. Runion, w/o attach. W. T. C. Shyeh, w/o attach. CUSAROSS 0084 J f (i * ^Chemical Co* rt *7 * \ 'J riTi O S+Jt'-m,/ O _$-/// A 'orsordid Honi^-crim-, exposure to VCl 3C0PC: The VCl in 1 mole of air will bo collec too on 1 gram of charcoal contained in a filtering Q-vico worn by a worker. The VCl -jill ho uashed from charcoal into one mole of carbon disulfide and analvred on a cr-i-cK.ntc;,r--;d .-RTfMTMt chsrccal, /ore glor-, -mil, u, ;-j,,C3 rr; of chorer.:-\-3 ir.-j*. a final pad . -1 >.S5 wool. Charcoal should be ho 3d ir. place by the glass wool sc that there are no voidsj Attach the .ibrcrpt'.'.r. n; it 1 r ir.; r ;-,i ! ge t. ' - : - r ' ik? 3 aip.e pc r t i .>r, , ' i g. t 1; Carbon disulfide 2) Charcoal. 3 } Serum bctfc3.es w/stcopers j) Graduate cylinder (ICO ml) 5) bob balance <- >Ci grans 6)i orjsc action or 7) Micro syringe S) Cooler 5) Class wool 10) Stop watch i7c& lit 3^ /I f^ --f T?rw- ; | 11) Portable bsttcry operated p'-uap \ 12) 10 dm 00 x 120 KM long glass tubes charcoal absorption units 13) Gas chromatograph Additional Materials for Calibration 1) Wet test meter 2) Analytical balance Turn on air punp Li 1L tiO |( aJ t I ?' iLi las proper C'-My- - ad;- s L pump calioi c.z,! on, l-i-'Jr/ licVit-V \ l ` r J j time rsquire':i.fc >xf' a t:'*a tu' - ^ _ h) Abtnth j.-r... .. i. -e ' >: :r 1. ,'i .TJ to his sal: t neve rin t"',u`_ i: in seer, a r.-y i hat it mill :.uc u. . _ ic: cork.. "> l *- ' 1 i'll't C i' C c;t ;j,i T. n J f ; the test iii i C fcun) f\ t t`; r. e:-ii a r.op t h.!1 p-jr.o rf r.': 't .iiso. 1) To analy?. e the si 5 rcu' coo 3 tjo rerum euc:!! (f'O + 1 on) of Transfer r.".r snail . t r .i. o: 'r L: i Oi.aCtt r.ius cnc o: first scrum bottle- line..'-' me u OS- iron the second serum :.;:fct'j-. ua z ivTinpe. tecs transf-r ,uk'. cunUott of the ab:.cvp",'. .a -! ; Mi hecojvi cci'iii bottle zr, i nr. i. `.o tn: contents of the syringe > 7) Stopper the serum bottles end plan- cs 'wrist action shaker ror 3 C in-na. 3) Liquid VCl U) Standard (VCl in air) gax (SCO ppm level) 7. GCiIMKi-: >, 1) Prepare absorption units (glass tubing li \ inches lor:;;) with glass v:ool;. 0,10 grams cf 8) ir.ieot /'r-jnple of the su;fn:: imu'i l oesi into a chromatograph in suoin e J ;.U multiply the average peel hey - Si t..e tr.'C pack tit.,on the footer oi i1.) r ( 1 ; ppm (due bp pens m r,2 ;" establishing, curve and iz.de:. CUSAROSS 00842 Dstirr.ioe the rlVC jjr. L ^ I* ^ r, c TJ.'l docile ir oh? r ;r"l0 <<- ,*J -* *-.< , v l,.l, v. bOJ: add it to the .ecult of the second bot tie for the to':al nolo p pm 3 l HcPC'S/i: 1 i I i[ iti i< i i\ i il \ j ii if CUSAROSS 00843 ti .o Procedure @3.20b.?7lajl' I APPENDIX fix To calibrate a monitoring pump with a wet test meter. The procedure requires one nole cf sir punned through absorption tube as it is bsir^; earrise by the worker be in" monitored. One mole of sir " 220! L at standard conditions 25.k5 b at a-.bic-nt conditiora CiJO cua ft. at crnditior.a Place absorption tube, cm the puna filter so that the inccmlrv: sample will pass through the large portion of the charcoal first. Attack, flexible tubing to exhaust port (top) of a v:st test meter and the other- end to the absorption tube. Turn cr, the pump and adjust pomp flow so that wet test meter rate is 6 J-i cu. ft. an hour at a 1 minute observation. This setting will punp a .Tele of air- in ten minutes. If the pump being calibrated is not capable of pumping one mole of air in 10 minutes, then simply reduce the volutsn of the solvent to the proportion of. a mole that the puir.n cen.-p-.vip. Examplet OfcJi pump ,t1 can only pur.p ?2,3,1 of a nolo of air in 10 minutes co inr.toed c-f using 1 mole of Of ^ (60.1 cz) only h3o5 cc is used. The ratio remains the some so no further calculation is necessary. If ths pump being used can only pump a small portion of v. ncQs '.ho above procedure cannot be used because there will not be enargh solvent to desorbs the TOZ from, th.e carbar.. This being the case taka ths sample at the capacity of the Lre::p then multiply the final answer-by. a dilution factor based on the foilerrag formula.. L la a Mole of Air 1 i -cic s of rriven t L in'iiaauis * =' Dilution Factor Example: GT6R Pump if2 (Sipin) pumps at the rate of 2.7? L in 10 minutes. (The solvent is reduced to one half a r.clo) 2g^g X og 27?7 ~ in !u!>? Silution Factor CUSAROSS 00844 procedure 2e3o2,,0o**7hl5U APiSKDIX 2 To establish a curve or peak height factor for chromatograph analysis , Prepare three serum bottles with 1 aele each of carbon disulfide (76olU grans or 60,1 nl)o Obtain the gross and net weight to the Jith place, Cool and add through the stoppers approximately 0,05, 0,10 and 0,15 grams ofVCl, then reweigh. Obtain the peak height for each standard by injecting 1,0 ul of each standard in duplicate. Calculation Mole ppr. of Standard K f-_x f _x v x*iT 'Af- A ' " Weight of 7C1 B = Mole weight 7C1 (62,5) C = Kble vsight of 032 (76.Hi) D * Weight CS2 Mole ppm per chart division "or factor = Mole ypn of stardand 100 _____ Average peak height x % efficicr.-.:; of charcoal To obtain % efficiency of absorption tube pump one mole of (VC1 in air) standard gas, thru an absorption tube as explained in procedure- and compare its peak height to these of the etaudard. Example 1 , Pittsburgh Activated Carbon ?.C.,h. 12 x 30 is 100!? efficient at ICO ppm l-3"cl. CUSAROSS 00845 Procedure 2c32.0<,-7lil5U APPENDIX #3 Graph jf\ is for Pump #1 Columns A & B on GT&R flame ionization chromatographe Graph #2 is for Pump if 2 Columns A & B on GT&R flame ionization chromatograph. This graph includes the h.59 dilution factor. The folio'.ring conditions are established on GT&R Perkin"Elmer 3920 Chromatograph. - Helium Pressure - $0 Lbs. per sq, inch Flov; - 22 ml par nin Columns A &. B Column Packing - 15% Apia on SL' on Chrcmoacrb ' d ' Q . Columns A & 3 So <3A Hydrogen Pressure - 30 lbs. per so, inch Columns A B Air - ii5 lbs * par sc. inch Column Temp, - 1);0C Detector Temp, - 20CCC Recorder Chart Speed - 1:0 nrc/min . suAt-k. l(<y Notes Because cf the high sensitivity of this c.'nrouahograph there is a small contamination peak that eludes ;?ith the 7CL sc it is necessary to subtract 6 chart dirlsicn3 from the VCL peak before applying it to the graph. i v CUSAROSS 00846