Document 3eJbyBOE2kXLE54ReJQKLzQ4a

`industrial Hygiene Digest - 39. Januaryt 1950 125 Mleroanalytleal Determination of Mercury In Organic Compounds. -----M.O, Korshun and E.V. Lavrovskaya. : Zhur. Anal. Khim. 3; 322-328 (19U8). The method la. a modification of the Boetlua procedure (C.A. 33,1628). The changes made in the packing of the combustion tube make It suitable for determining mercury regardless of other elements present. The method - Is described In detail. -- Condensed from Chem. Abets. 126' Photoelectric Measurement of Coal Dust Stains on Filter Paper. .. C.N. Davies end Mary Aylvard. Brit. J. Ind. Med. 6, 25^-258 fl9^9) * Airborne dust la frequently assessed by aspiration through a filter paper followed by photoelectric measurements of the resulting Btaln. This account of experiments with coal dust shows how the calibration depends an particle Bize, and the low sensitivity of the method for small particles, when large ones are also present. Is exposed. The work was carried out with a hand-pump and densitometer developed by the Pneumo coniosis ^Research Unit ..of the Medical Research Council. The theoretical basis of the measurement 1b discussed. The increase In resistance to air flow through the filter paper, due to the deposition of coal dust, was also studied. -- Authors' Summary 127 The Determination of Gamma-Benzene Hexachlorlde In Insecticide Products. T.H. Harris. J. Asboc. Offlc. Agr. Chemists. 32, 884-690 (19^9) The method described is a modification of that of Munter and others, given In C.A. h2, p. 698l f. The advantages of the method are fever fractions, collected, simplified apparatus, and more rapid analysis. -- Condensed from Chem. Abate. Preventive Engineering 128 How to Control Fumes, In Hcmferrous Melting. R.H. Haley. Foundry. 77 . llQ-,121 (Sept. 19^9). The problem Is discussed with special regard to the lavs of California which are extremely'rigid in_requirements concerning emissions from nonferrous metal melting. The author describes the procedure used at his plant, idlere crucibles are used regularly. In his summary he says, "these points have been emphasized; (l) the need for correct furnace construction; (2) the maintenance of a clean and orderly workshop; (3) the care employed in selecting, exactly the right temperature to withdraw the metal and prevent flaring; (h) the utilization of the flux and slag - as a crucible' cover to prevent contamination of the molten- metal and the emission of oxides; and (5) the necessity for a furnaceman with quali fications equal to the requirements of the job.