Dust determination and the risk of silicosis

U Holandiji je izvršen velik broj određivanja prašine radi procjene opasnosti od silikoze u različitim industrijskim granama, na pr. u keramičkoj industriji, Ijevaonicama, obradi kamena i rudarstvu. U tim određivanjima najčešće se upotrebljava termalni precipitator. Taložene čestice prašine se nakon spaljivanja broje pod mikroskopom u tamnom polju. Kako bi se ocijenio sadržaj silicijeva dioksida, uzorci se obrade toplom solnom kiselinom. Sastav manjih čestica se često razlikuje od krupnijih čestica. U programu je koordinirani studij prašine i sadržaja silicijeva dioksida u ljevaonicama i pojave silikoze kod ljevača.In the Netherlands many dust determination have been carried out in order to estimate the risk of silicosis in different branches of industry, e. g. ceramic industry, foundries, stone cutting and mining. For these determinations we use chiefly the thermal precipitator. The deposited dust particles are counted after incineration under the microscope in dark field. In order to obtain some idea of the silica content these particles are treated with hot hydrochloric acid. The composition of the smaller particles often differs from that of the coarse material. A coordinated research fa planned to study the dust and silica content of the air in foundries and the occurrence of silicosis in foundry-workers