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METI~'L IBOCYANATb: I~i CIOA~I~TT~" ~'CKE /J~D ~T~ R!;T~;TIOE BY AN B_.. J. ~ and R. G. Honeycutt -- !leseareh Department :: :i (~ Liggett ~ld ~!yerm Tobacco CO. ~. ~: ~o~l dzoeyenato (CH)N~C=O) was identified ~a~d q~Lntlts%~vel~ ,: ~a ~: • it, determ~de~ ~n the s~oke ga.~es of 85 mm lon~ commerela3"el~are%te~. ~imilar quantitr~t~ve deterzinatlons %'ere a3.so made on the smoke,:~ clgarcttes made fret: pure Bright, Burlep ancl Turkish tobaccos. ~.~ethy] isoeyanate ~as Isol~ted from the -~0°c' conde~ssb]e s~oke gases by g;~r ]~qu~ c~ro~ato£raphy on ]o~' actlvlty fluorocarbon ~,:ubstrate~ us~rlg t~re~ different liquid phosez ~;, succ.essJon (ea~bovax 1500~ ietr~et yleneg]ycol dJw,ethyl eth~.r and 3,3'- oxT¢dilroi~l~n~tri3e). The ldent~f~atJon ~f :~e~hp~ Isocyan~ito ~as base8 on retention tl~les observed on t|~ese throe d~ff~rent co~un~ns. Co~f~'n~.!t~oI~ ~as go~[led h~ the ~nfrared and ma~s ~i,ee~rs of ~ fra:t~ml col]coted ~fter successlve passes cf t~z~ smol, e ~ase~ on the three preyS:us]3, t.isrd:~o*~e~ ~lq Id phases° Qn~t~t~,t~ve data w,re obtalned by Infrared ~peotrophotor~tric measurer.cuts 9erfor~.od on lhe 2273 em"I band of ~ethyl i.~otym~te~ d'~r~'etly on the erudrqy fractlc,nated smoke ssvple. Th~s zethod dS~s nnt ~ehn~re th~ rather time consuming gas chromato~ra~b~c separations. It al~b avoids the losses wldeh are difficult to prev~n~ whenever ~a~ chromato~raphlc fractions are repsatedly submitte&% @© In,cotton, colloct~o~ and transfer processes. The retention propertles~ fop i i ethyl laocyannto~ of ml ~_mpaction-typs filter (ce]]uloze acetate) and of a co~,bined i~paet~ m-~daorption filter s~ec:la31,' [rented • >. ch;,,eoa~ Er~Imlo~ eont:i~ne~l ~n a compartment Betweer~ t~o ee]hilose aoet~ite filt~r~) were ~,tudled anl] the results ~r~ dl,qc!issed. ATX02 0060003