Document Z84o5w1n9vV3dV0RNaRNZn2NO

industrial HygicwcDlgest August* 1961 purpose of comparing or raUting thi data to data trony almilar measurements* Tba metal measurement# of the National Air Sampling Network are agilfnatss used for relative compart* one* and, therefore, are affected greatly by changee In filter composition. Similarly, the growing number of etateand community network# (New York, Massachusetts, Texas, Wasbing- ton, and Maryland! mean# that the sampling agency hie the responsibility of determining ana lytical characteristics of the filter# being used. Thi# i# of fundamental importance, if oamplee ar# likely to be analysed at a later date or if the metal data are to be compared with national, cute, local, or special study data. All media evaluated In thi# peper posses# analytical characteristics suitable for moet eampUng program#. The difference# between various sap- pliere* brand# of lb# glass fiber filter# make it mandatory for the uaer to maintain tome form of quality control over the filter medium* The quality control program required may bo very simple or very comples. This will be' dictated however by the extent of the sampling program and the complexity of the expected analyse#* -- Cood. from author#1 summary 746 Dust Measurements in the Austrian Hard Metsl-Industry; W. KiUler. ,* *. Staub >2L,. 510* SU, 4Dtc.dSr ItyU* ' \'k< * * .t ' .* .* ' * . *-v . * . ',,* , *.-.. . ? Tv# factorffVbendl'ing tungsten, cobalt, titanium, `tantalum and niobium, w'egrw studied ' by mean# pfa Gothe filteVapparatua fofr walght cbneemratipft ami # kor&mstsr for numb#c*of partleld'B* Tbs `former indieitcjf'the pretence in fhs atipoephere of up'to 46 /di.m*, tnitaly ( * tungsten, and tlia latter bp tb it), 000 particles per.cu.m, Th'k rssuits of the sampling are com- . pared with data.from bther countries with unfavorable conclusion# regarding condition# in the AustrUn ssiabUshmenti. Bull* Hyg. . ml 747 Cloth Filtration of Fine Aerosol#, T H. M, Valentin Brit. Chem* Eng, 7, *8.271 (Apr. 1962). . This study deal# with the influence of Various structural parameters of a doth on retention efficiency and pressure drop with respect to a fine (1,0 micron) homogeneous ammon ium chloride aerosol. A total of 24 different cloths was tested. The material used was cotton. Wool, tarylene, and #iUeone-impr#gnatsd glass doth were also tested, but no significant dif ference s were found between these materials* All effects could be ascribed to tbe cloth and fiber properties and not to tht chemical nature of the fiber. All fibere simply acted ae solid cylinders, which was expected in view of tbe electrically conducting nature Of the aeroeol. -- APCA Abet#, 748 Pulmonary Disease of Ferroalloy Worksrs. F. Prind, L. H. Miller, A. Davis and J. Cholak. J. Occ. Med.. 4, 101-110 (Jung 1962). A pulmonary diseaeo of occupatidnal origin has been described that the author# have not found in the published literature. It is characterised by recurring bouts of seat# pneumonitis with cough, whsesing, anorexia, loss of weight, increased sedimentation rate, linear and nodu lar fibroele in the cheat roentgenogram, and ventilatory impairment, and is associated with ex posure to high concentrations of metallic aillelde fumes. Free crystalline silica, either as dust or vspor, was not found in either the atmosphere or the pulmonary tissue. The entire natural history of the die#### is not clear, but it it suggested that it probably baa occurred among em ployees in other ferroalloy plants and has not been recognised. Authors' summary *49 Dust Control in the Cement Industry. N Pllpel. Brit. Chem. Eng. 2* 858-263 (Apr. 1962). There are several stage# in the manufacture of eement during which considerable amounts of dust are generated. It is produced during the crushing of the raw ingredients. In sthe firing kilns, in the qenhent grinding mills, whop powdeced matart*U are belng cpnveyed from one point to another and when the finished cement ia packed into bags for shipping. The ( * amount,pf dust can be* reduced other then by Instilling' dust collecting equipment at the pqlnts * * * where milling, firing* end clinker grinding are beingacarrled out. On# of these la the granula tion ,of the raw meal with water prior to firing] another method is to.rsdtiee to a minimum th#. amount of disturbance occasioned when fhe raw fhgrsdien|s and flashed content Are conveyed to