Document YrbZ3rng5Mz6RZnObbGbqZRpD

Industrial Hvaiens Digest Augutf, IQMl professional groups in the filed of occupational health* In these studios both sociological and economic information should be developed and should provide a baseline for evaluation of engineering in relation to specific occupational hazards, Authors1 conclusions 809 Weigh Odor Control Methods Carefully, W. Vlessman. Hull. Pip. It Air Cond. 11., 94 |Sept. 1959). T.> eliMinate or abate an odor condition In an air conditioned space It Is nocdn..,rv w.u.v:* *.' ?< offending gases or vapors or r4duce^their.copcentration. Sources odors are many,* and detection and measurement must ultimately rely on human apprai,...;. Odors Are affected by temperature and humidity. They may not only be objectionable . sense of smell but may also cause irritation to tho nose and throat. Some of the phvsi.;,, methods for removal are by ventilation with outside air, air washing or scrubbing, ch. adsorption, and masking. Chemical absorption or destruction of odor sources, rape:- tralizatlon, mssklng, and catalytic combustion are other means. For a given building tr.v quantity of outside ventilation air admitted should be in accord with engineering suuid.W* and local codes. The author presents an example of possible economies and comparatu-, investment and operating coats of an outside sir system and a recirculating air system. - Cond. from Author's COMMUNITY AIR HYGIENE 810 Adhesion of Solid Particles to Solid,Surfaces. Margaret C, Kordeckl and C, Orr, Jr, Arch. Environmental Health 1-9 tJuly 1910), The tenacity with which particles typical of those found in polluted atmospheres adhere to solid surfaces lake building walls, automobile surfaces, and plant leaves, ws in. vestig&ted over a range of relative humidities. Docause of great variotion in individual -<J. hesion tensions, size distributions were determined covering fnany sdherlng particles bur.in and after subjection to increasing disruption forcu* applied to all the particles by means ct 4 centrifuging technique. Particles continuing to adhere alter centrifuging at increasing #p'*cwere found to shift rather uniformly toward the smullur sizes, both when singly and ulmo.idistributions were employed. Average forces of aoitesion were found to ogree reasonably . with previous muasuremimta, and, as would be expected the data suggest that electrostatic forces exert their primary Influence at low rotative humidities while the surface tension ..I condensed water films bocomes important at high humidities. Finally, calculations shin* t>.v exclusive of precipitation, natural phenomena like wind and vibration can never catisu r-. entrainment of more than a small portion of partfelo drl.rie once it becomes a ftAched. Authors' summary 811 Mu.'ti-Operational Chamber forXVUjbrntioit Purr.tse*. K 5, Drluf nd Am. Ind. I'.yg. Assn. J, 21, (June I9a). W. {.hurra. Frequently during industrial Uygicm. and air pollution work, a need nrisi-c f*r chamber which can he used /or calibration purposes. A multi-operational calibration i b..r.. has been designed and built for this purposo. Thu chamber Incorporates oxtreme flvuyil". operation. Roth static and dy namic operation are feasible within this chamber. Thus, > tl. continuous nod batch jjimeration of gases, vapors, uustu and mitts c;u be uiillxud to pr> any rossotiabio *eieorttr.itW>n of these materi/Ur wllhin the chamber system. The niJ . ' * that cun lx1 prepared are used to iiuprovn the ucc.rnry or industrial hyi'feue and air ->) .? field sludies, os well an permit research and devul'ipmitnl work in those fields, bpurir for this cat'hr.Miaik chandler include: (I) ('atib.M'.fen of air dnnrip.ing and detection <! : * *