A mercury control technique.
Am Ind Hyg Assoc J 1984 Jan; 45(1):B7-B8
A process modification for controlling mercury (7439976) exposure during manufacture of fluorescent lamps was described. The modification involved using mercury containing capsules for releasing mercury in the lamp tube after the tube had been sealed. The capsule was a small sealed glass tube, approximately 0.5 inch long and 0.0625 inch in outer diameter, that contained a specified amount of elemental mercury. In use, the capsule was attached to the outside of the cathode shield on the mount assembly. A thin wire was placed across the capsule and was attached on either side to the cathode shield. Mercury was released into the lamp tube by splitting open the glass tube at its center using a proprietary method. Using the mercury capsule resulted in complete enclosure of the mercury addition process. Time weighted average (TWA) breathing zone mercury concentrations were 0.026mg/m3 when the capsule was used, as compared to TWA concentrations of 0.066mg/m3 when a vertical process using gravity feeding was used. The author notes that using the capsule also results in a reduction of mercury usage.
NIOSH-Author; Industrial-equipment; Industrial-environment; Occupational-exposure; Heavy-metals; Industrial-hazards; Fluorescent-lighting; Control-methods; Mercury-vapors; Air-sampling
American Industrial Hygiene Association Journal