Abstract

Atmospheric contamination by lead presents acute problems in analysis and control to the chemical industry. A mobile instrument of extreme sensitivity has been developed which furnishes a rapid indication and an approximate assay of localized relatively high concentrations of lead, combined or elemental. Samples are drawn through a condensed spark discharge adjusted to minimize air lines and to excite the lead spectrum which is photographed with a small quartz instrument. Visual examination of a series of exposures provides data on lead concentration as a function of time and location. A sensitivity of better than one part in 20 million can be maintained in routine operation. Instantaneous response has been realized by substitution of the photoelectric Geiger counter for the photographic plate, as described in detail in the following paper.

© 1949 Optical Society of America

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