熔接衛生に関する研究 (その6) : 熔接工肺の偏光顕微鏡所見

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  • Studies on the Hygiene of Arc-welding : (Part6) Findings on the Preparations of Welder's Lung by Polarization Microscopy

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An examination by a polarizing microscope of one case of welder's lung, in which free silica and silicates had not been detected by X-ray diffractometry, could defect quartz and talc particles in the lung tissue. Assuming from the results of a study on the baby powder affecting lungs of infants and school children, I estimated that the amounts of quartz and talc particles in the tissue of the welder's lung were 1.5 and 12 times the values of calculation respectively. The distribution curve of the particle size of free silica and silicates in the tissue of the welder's lung had two peaks. The particles were generally very fine. This fact agrees well with the experimental result that fine particles of free silica and silicates are emitted from the coating material of the electrode below 1, 000°C. After prolonged exposure to welding smoke from electrodes of ilmenite type, lime titania type, and high iron oxide type, this patient had a history also of exposure to the welding smoke from low hydrogen type electrodes. It can be considered that the alkali contained in this welding smoke promoted or accelerated the influence free silica and silicates in producing fibrosis. The fact that a large amount of free silica and silicates were observed around the wall of tuberculous foci, suggests the affinity between free silica or silicates and tuberculosis. As the welder's lung contains a large amounts of quartz and talc, it would be considered rather that these no doubt play an important part in producing fibrous changes than that only dusts of the oxides of iron are responsible. The extent of the fibrous change of the welder's lung did not depend upon the amount of the deposited dust suggesting the effect of the duration of exposure. The author should like to better specify the welder's lung as a magnetite lung than an iron oxide pneumoconiosis judging from the components of the welding dusts.

収録刊行物

  • 産業医学

    産業医学 9 (10), 737-741, 1967

    社団法人 日本産業衛生学会

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