The Annual Cycle of Some Minor Elements in Linsley Pond (North Branford, Connecticut) as Determined by Optical Emission

  • Ursula M. Cowgill
Part of the Developments in Applied Spectroscopy book series (DAIS, volume 10)


A procedure is described employing a Jarrell Ash direct reading optical emission unit. A special optical arrangement was developed for this study. A 55 mm focal length, spherical quartz lens was used in the arc stand to focus the electrodes’ image on a variable aperture located on a rider base on the optical bar. This aperture is closed down to eliminate the incandescence of the electrodes entering the instrument. A 135 mm slit mounted lens was employed to permit the light passed by the mask to completely fill the grating.


Annual Cycle Optical Emission Watch Glass Variable Aperture Rider Base 
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    Israelyan, A. D. 1959 Trace elements in the ash of Maikop crude oil. Trudy Azerbaidzhan. Nauch. - Issledovatel. Inst. po Dobyche 8:274–281. ( Chem. Abst. 55: 18082L ).Google Scholar
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    Jarrell-Ash Company 1970 Determination of mercury by flameless atomic absorption. Atomic absorption analytical method. No. Hg-1. pp. 1–6.Google Scholar

Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • Ursula M. Cowgill
    • 1
  1. 1.Department of BiologyUniversity of PittsburghPittsburghUSA

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