Document N01yB5RLVgbprd2mDEqQgGLE

'WmKWmi-IMMtRM.*! Hvnl.n. Pla AuftuH, 1961 dynamic* lystam of known initial concentration, aa function# of adaorbant bed depth and air detention time within the filter bed* The odor control performance of carbon-loaded rayon . monofilamenta depend* on the type and proportion of activated carbon used. The filter effi- cieney in turn determine# the rate of odor reduction in a cloeed apace and the ultimate or equilibrium concentration when odorant generation and removal occur simultaneously* four type# of filtere were evaluated: rayon loaded with alr-or water purification carbon, granular Sir-purification carbon, and open-lattice commercial filtere. Air laden with aynthetie tobacco malodor was dreamed through successive increments of adsorbent bed* It wae possible to estimate adsorption efficiencies and, by repeating the measurements after various degrees of carboh saturation, to construct adiorption waves. It was found that air-purification carbon was superior to water-purification carbon for loading in tha rayon filaments, and tbat ail the rayoncarbon compositions wore much superior to the commercial opan-lattico filters. -- APCA Ahata. A Study of Air Pollution Carcinogenesis. PI, CercinoRenlc Activity of Gasoline EngineJExhaust. . Condensate. - Is. U. Wywdsr.Vnd D. Hoffman. Cancpr 15. 10) (1961).*. * . *. ' 'V *V , * . , *. * k * Arb|fnieni extract of gq#eHnek.pbglna shhvitaMtsr" (fs>Csuer, Ifi^, .fl (1.962)) yii ^yiinted 3 times per week for IS'mpntbf on tbd hackj'of Syili mica, in'concentrations. of.SQ, *33, . 25 10. and 5% In.acetone. Cipqrottcsmoke concc'ntrata, eimiUrly dissolved in.ecetone, was . hw- also paln'tad'oa mice. In qrddr to csnfpsra fibfeAcy of junior induction. 'Atynsl# painted with the 50% tar/acetone solutions received approximately 0.85 gm* per,month of engine exhausf tar Or 6.9 gm. per month of cigarette condensate. Theenglne exhaust tar proved to be about 1 l/2 to 2 times as activs as eigarstte condensate, in terms of total papUlomaa and earcinomae de veloped at each concentration. Since the concentrations of known carcinogen# in the ter wa# 50- 100 tlma# higher than in the condensate, the possible presence of the antl-cercinogene Is sug M: gested. -- J. Occ. We'd. Abate. MANAGEMENT ASPECTS IS 992 Consequences of Age Standardisation Procedures for Statietlce of Slchrfeee Absence In Industry. M. J. W. DeCroot and P. van Leeuwen. Ind. Med.h Sura. 31, 263-271 (Juno 19621. This publication present# a dompariaon of the direct and indirect method of standardi sation. An analysis is made of the quantitative differences of age standardisation applied on absentee datp of 93 plants participating in the Diagnosis Statistics of tha Netherlands lnstituta for Preventive Medicine at Leyden, Netherlands. From this analysis tha conclusion Is drawn that tha Indirect method of standardisation Is to be preferred. The advantage of this method is more pronounced when some classes are undermanned or even empty. - Authors' summary ACCIDENTS AND PREVENTION 991 Use Solvent* T Watch for these 5 Hctarde. H. H. Fawcett. Occ.'Hasarda (July 1964). When solvents end electrical equipment get together, the safety man.muet thwart the#o potential hataYdst (I) Fire. (2) Toxicity. (3) Skin Trouble. (4) Chemical Reactions, (51 Effocts on Plastic end Insulation, Among commonly used solvents, bonaene, acetone,' |tiolino, and ether >ro ell highly inllammeblei On the other epd of the ecile*are AbnAammablea, ueh a* carbon tetrachloride and ihe'Freone. High fleeh points dbee not'mean freedom from'fire* * 4