Document zoB5QOpV0BNxnQ1Loe1aKdQm3

74 Annals New York Academy of Sciences Nagelschm in the study of ooal miners' lung residues. Tbe use of antifoeming sgenti pfrom Great Britni (Talvitie A Brewer, IMS') ha* chanted the situation, and it is likely ths ['bund, irrespective destruction of the lung tissue with hydrogen peroxide or anhydrous form*- ' faulty technique s tnide would be better method* than ashing, although the residues wcuH ,'asbestos, eepeciall; Istill have to be. freed from carbonaceous materials and, if present, hy Vllkely that this droxyapatite; asbestos bodies, do -not seem .to be attacked by hydrojn is. real and nee peroxide, - 7' fubestoa does get c . In the study of asbestos lungs from South Africa the acetic acid methoi, ito start with a re; ".'was Vised because we wished to avold'isshing and because this method wu` -(blnurn, which wo .. uaed as a routine, at the time, in the study of coal miners' lungs. Althoagb ^..physlcocheniic ^'not ultableforth* Isolation of chryeotBe^iiseenw to.be apoaslhlejnetK j'^for'laolatitig anioelte iiid crocidoirte; Yt mu JtWmosf rosista; terlal that forms' asbestos bodies,'.but'it leaves carbonaceous material is- residues would be tact. "Coal".is in fact determined by the loea in weight found on.sshlai The most prove the acetic acid residues.'' -y Itie! fibrosis, in The acetie acid method was used pn IS samples of the previously examW :;mo*l other forms asbestosla lungs from Great Britain.'The yield was, on average, about fcaX. develop. A theory of that given by extracting the S80* ash with OJ N hydrochloric acid',] advanced (Nageb Although the acetic acid, residues contain more carbonaceous tnaterU), 7. Ing in the lungs they weigh lets because most of tbe iron compounds are missing. t'pneumoconiosis, : Separation of ckryiotOe. Electrophoresis of dust in 0.001 molar sodiun severity offibros chloride at pHBwas uaed ln the Sheffield laboratory In tbe etudy of allidj modifications. Oieervailons by Bergman and' La'ngriab suggest thiit it may' ; advanced staged be possible by this technique to separate chryaotlle, as this mineral carrl* 7fibrosis, as seon 1 L a strong positive charge in contrast to amoeite, crooidolite, quarts. Ilicc. and kaolin,; which are all negatively r` In general, tbe more tbe asbestos can be concentrated' in a sample expressed by Bep easier. is its .identification. .Mlcroaceqpy^wJth. polarised Ughljmdyu.lUbk Vi?^ImmersionItmiida'and'X-ray or eloctron dlffrkeifon^are nrdbabiyJtll* mA^S^isny years after A: v<b._v sv -Uuiis-BP-VA-- V: ^. .. bow well thlstechnlqu# works vilth flbera of the sdw fotihd^ln^tihg'reridea nor have we' any experience'with Interference microscopy | ... Electron microscopy bas been uafd to a limited extent. Strongly corvtf .' fibers seem Indicative of chryaotlle although Huggins (1959) bas showi&Vgno**, j>. j. 5933. that crocldolite (from Bolivia) may also occur In curved form.. .'K)" Paa,P. J. 1649. 7 V- ..' l-.-'. :,j7'r..*7-'**.*'';: -...*>*.- V.'-: ' ConcJusMm.'. .'- .- ' ': V,; ,:;m::HnOtti>*a,aW. '' XorrtCXHOr, C A.,..i ; Tht most interesting result of this atudy_U_that In.over, half the iuaw,iiw^AOia^CWMn,T,( PQ8000 0969 PRODUCED BY FORD