Document zoNBxaO07v3n2Ebk6aXY3oVM3

Industrial Hygiene Digest June, 1969 568 Nine Years'^Toxicity Control in Insecticide Plante. I. Hoogendam, J.P. J. V*rte*g, ud M. dc Vlieger. Arch. Environment*! Health _10, 441-448 (March, 1965). More than 300 workers hove been employed in the Royal Dutch/Shell plinti m Pernis manufacturing aldnn, dieldnn, end endnn over period* up to nine years. The** worker* have been under thorough medico! supervision, including periodic electroencephologrophic exommotion* and liver function teat*. Seventeen of them hod convuitive intoxication*. Five of the** 17 hod more thon one convulaton eoch. Clinical, neurological, and electroencephalo graphs recovery has been rapid and complete m all cases after removal from exposure, ..-.ough at times this was only temporary. No impairment of liver function could be detected The pattern and rot* of absenteeism is not different from that of other industrial worker*. The maintenance and supervision of hygienic discipline and selection in personnel placement are important factors in controlling toxicity nazards. .. Authors' summary 569 Bird Mortality after Spraying for Dutch Elm Disease with DDT. C.F. Wurster, Jr., Dons H. Wurster, and W.N~ Strickland. Science 148, 90.91 (April 2, 1965). In Hanover, New Hampshire, where elms were sprayed with DDT, 151 dead birds were found; 10 dead birds were found an Norwich. Vermont, where no DDT was used. Chemical analyses of dead birds, observation of symptoms of DDT poisoning, and a population decline after spraying all indicate severe mortality among certain species in Hanover.-- Authors' abst. INDUSTRIAL DUSTS jI I 5*0 Asbestosi* and Pulmonary Carcinoma. F.R. DutraandJ.D. Carney. Arch. Environmental Health l6, 416-431; editorial comment 422-423 (March, 1965). Asbestosis is a chronic progressive pulmonary disease which results from irritation of the lungs by crystalline atbestos fibers. The disease is often unsuspected clinically because the occupational exposure to dust containing asbestos fibers has not been elicted. and because the chest films may not be diagnostic even in the presence of disabling abnormality. In asbestosi*. pulmonary and subpleural fibrosis distort the lungs and lead to respiratory in sufficient. Squamous metaplasia of the bronchia, epithelium is induced by the irritating fibers, and in some cases there is progression to scuarr.ous cel! carcinoma of the lung. Pleural mesothelioma is also reported, particular,', m cases of asbestosi* in South Africa. Authors' summary 5*1 Pulmonary Function of Uranium Miners. V.E. Art.ier. H P Bnnton, and J.K. Wagoner. Health Physics 10, 1183-1194 (Dec. 1964). u; ' /, 57: Analysis hat been made of several venti.atorv : -ret tor. field measurements made or. uranium miners in 1957 and in 1960. Results snow :.-.a: r umu-ative exposure to the atmospnere in uranium mines adds to the lost in ventilatorv function mat results from aging and from cigarette smoking. The data indicate mat nign raoor. oaugr.ter levels are associated with transient improvement in ventilatory function 7*o possioie explanations of this transient improvement are discussed. Long exposures -ranurn mines are definitely detriments, to ventilatorv function. There are 34 references Public Health Eng Absts v'.............. . ' ' ' Error the Determination of Average Concentration Indr. 1 t .a. .leasurements Juaa ano K B-szirse. Staub - . -13-287 iAug 19641 German D.s: as a Function of the Number o: Tne strong dependence oi dust concentration or. time leads to difficulties in the de termination of the average value A formula wmcr. reproduces tne sum trequency of tne dust concentration distnoution with sufficient accurac. .1 giver. Tne relationships for tne to>erar.:r m determination of tne average value are derived arc tr.e results are snown in a diagram