Document rB0MQwdNrBppM4wQOZmyE8Xw7

m g# 'M tAa iii ?. -V *3 AS5fla' i^W/fsi ,; n< i! - ,i .! * <' . U* . m" ".'A-\' '..' 4'-`,i*'' \5n ; :,*.V..*i".; . , *-i A Aim^iw4^{Uhu\ KIM i .*.** ^k"> -V.A;.* 442 AnnalaNcw^orkAc*demvof. Sejehce wwraw i _,!T!ti!l!i3S3S5^35Wytf^S^^^ jjy ?,rrr r^ das' and Dikes Organic IAatbcul Associated with Ashestos' ' ' Three type* of asbestos are used Industrially: crocidolite, amosite and ehrysotlie. The first two of these, but not the third, contain appreciable amounts of natural oils which may be removed to a large extent by extrac tion with suitable solvents.*M' Crocidolite, amosite and chryaotile may also contain secondary oils as a result of the addition of oil to the asbestos In rdar extractable (a) Tutt taneov ;r>, eontsmhutloiC Asbttfogjs iwrmally. -^transported arid %tofe<r.fn '3ute'bajr''ahd the`oil>>frorhf"ti>e jute fibers is' 'fo',v two species absorbed to an appreciable extent (70 to 80 per cent) by all three types of fiber. Jute bags are almost always used in the industry, from the point' carcinogen) before extr where the fiber leaves the mill to the point where the manufacturer uses it for bis own purposes. In processing, rebagging may be done and then * in carcinogi In contre paper-lined bags or plastic may be used, the latter being costly. suspension An account of the natural (primary) and secondary oils which may b* (2) the fib found in asbestos has been given by Harington elacwhere in this mono- with 8 dlfft graph." Tests, us Tkt Natural OUt As reported elsewhere,11 It is not yet known whether there are any quan titative or qualitative differences between crocidolite and amosite oils, nor whether these oils vary in yield and composition from batch to batch, or within the same sample of fiber. On the other hand, there seems little doubt that finely-divided asbestos yields more oil than the longer fibers In milled material. Large amounts of crocidolite and amosite oils (150 to 200 ml.) have been extracted from 45 kg. amounts of mixtures of both finely-divided and com mercial fiber, using double-distilled petroleum ether. It is important to record that the solvent used, for these extractions was of a high degree of purity. Ultra-violet and infra-red apectra indicated that it was apparently free of contaminating materials and no residue was detected when a twoliter aamplt was evaporated to dryness. The yields for both oils were approximately 0.8 per cent by weight of the crude asbestos fiber before extraction. The two oils differed in color and in infra-red spectra, and more poly cyclic hydrocarbons were detected in amosite than in crocidolite. A sampta of the crocidoUle oil was found to contain 1 /tg. benrol a |pyrene '100 . fiber and the amosite, 5 /ig. benzof a'pyrene TOO g. fiber. Details of these analyses are given by llarington elsewhere in this Anna!.11 The concentrations of lienxol a Ipyrnie nml Muted polyryrllc liyilr'4ftmns ore so low thst it is difficult to lielicve thut their pri-si-nce |ilays more than a minor carcinogenic role, evrn in arsons exposed most heavily to crocidolite or amosite ilusta. The elution by serum of lH-rir.o|altiyrcm' and those using died from visible at t asbestos fib eytes. Othc area contali not detected not been set BALB/C m especially it crocidolite, between gr> have been n* however, th; (b) Tr*t* < etr had After the had been re ef lung cam tury in the l tlnn u large IlDll born ns- anil biologic. Jn the bio native umm such hyrirocurtioiis from unbesto* is probably equally Insignificant. 8606 mo i PRODUCED BY FORD