Document rDMNek5jDddn5X6oaeVLoG1J

** Ctkaiiirwu-uiMtiv| i ~ai m WX-MlW* * u MHMtl **< gM<fO.MaBta*M*U. > W** ari. M( a i. GOVERNMENT Of WESTERN AUSTRALIA QQ GOVERNMENT CHEMICAL LABORATORIES ta. 331977 ADELAIDE TERRACE PERTH Ml *. vouatrr. WL/PL. Commissioner of Public Health, Public Health Departoent, PEROT. V .19th September,.1962. Attention: Or. D.Lethaa Physician, Occupational Health . ,^ j. ,-i, i i n i, w'- * Report on Samples from TittenooB received ITtfa 3uly 1962. The samples received consisted of the followingtLab* No- 6220/62, mark** "A.B.A. Duet Sample, No. 1" Lab. No. 62U5/62, masted "A.B.A. Dust Sample, No. 2" Lab. No. 62L4/62, a filter pad from a respirator. As discussed with Dr. D. Lethaa, no work has been carried out on Lab. No. 6244/62. Microscopic examination Lab. No. 6242/62 "A.B.A. Dust Sample No. 1" Sample consists esf quarts, hematite (iron ccdde), chalybite (iron carbonate), dolomite (calcium magnesium carbonate) and magnetite (magnetic Iron oxide) with a little blue asbestos end organic matter. The particles range in sise up to 12fX in diameter. The average particle sise is of the order of Xu* The asbestos fibres range up to l^<.in length.. Lab. No. 6243/52 "A.B.A. Dust Sample No. 2a Sample consists of magnetite, quarts, blue asbestos, chalybite, dolomite and hematite. *y The particles range in sise up to 600^ in diameter. Th average particle sise is of the order of 2-3^. The asbestos fifcros ere up to 600w.in length but would average about 10 u.. ' Cor.t'.nuM............ WV-004104 Sizing The dusts were sited by air elvtriation in a Roller Particle Site Analyser with the following results s- Fraction microns +50 -50 + 30 -30 +10 -10 +4 -4 lab. No. S2U2/62 lab. No. 6243/62 o*r cent ee* & ^ - UJ* 8S.6 17*3 7*0 17*5 42.0 Beaarks tab, 56, 62U2/62 The +4Afrection was obtained by direct weighing and the--4/ fraction 'W difference. ^Sample required washing with petroleum ether to restore a contasdoating oil which prevented siting by Roller machine due to formation af agglomerates. Microscopic examination of final products showed good separation into the two fractions. Iab. flb. 6243/62 Microscopic examination showed reasonable separation within the normal size ranges, except for a snail amount of asbestos fibres with lengths 7 to 10 tinea thcnoairel particle diameters. Asbestos fibres were more evident in the coarser sizes with carbonates, quartz and magnetite being identified in each range. Cemoceition The percentages of acid-soluble irmn, carbon dioxide and acid-insoluble material have been determined chemically in these samples. The percentage of magnetite has been estimated by r-agnstic separation, and by microscopic examination. Hus acid-insoluble materiel, which is essentially asbestos end <vcertt, ha been divided 4rrt:ft i*a CGfflponer'ts . 3y combining these techniques, a very approximate composition of the dusts is obtained as follows:- !'./*rrekit' K r-oV'*''! ? .v--Polori!.n Sii. lab. So. 624V62 cor rent 7 3*3- . lab. No 245/o? 53 r"V 1? 2? *>0