Abstract

The simultaneous determination of a number of elements by atomic absorption is based upon the combination of desired characteristic radiations from hollow cathode tubes into a single, collimated polychromatic beam that is passed through the absorbing medium, is then resolved into its components, and each component is brought onto a detector. The radiations are combined by locating each source behind a slit that is so positioned with respect to a diffraction or dispersion element to satisfy the diffraction or dispersion equations under conditions which bring each beam along a common path to a single exit slit. The combined beam is resolved into its components by conventional spectrometric principles. Methods by which the optics may be folded to accommodate all elements within a single enclosure are described. The sensitivity and precision of analysis obtained by this method were found to be equivalent to the results of conventional single element determinations.

© 1968 Optical Society of America

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References

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  1. R. Mavrodineanu, R. C. Hughes, T. R. Kohler, “Direct Reader for Flame Emission Measurements,” Philips Laboratories Tech. Rep. No. 173, 24June1964.
  2. I. Newton, Opticks (Dover Publications, New York, 1952), p. 142, Fig. 7.
  3. A. Walsh, U. S. Pat.2,847,899, 19August1958.
  4. R. Mavrodineanu, “Atomizer and Burner Unit for Flame Emission and Atomic Absorption Spectroscopy,” Philips Laboratories Tech. Rep. No. 207, 20January1967.

Hughes, R. C.

R. Mavrodineanu, R. C. Hughes, T. R. Kohler, “Direct Reader for Flame Emission Measurements,” Philips Laboratories Tech. Rep. No. 173, 24June1964.

Kohler, T. R.

R. Mavrodineanu, R. C. Hughes, T. R. Kohler, “Direct Reader for Flame Emission Measurements,” Philips Laboratories Tech. Rep. No. 173, 24June1964.

Mavrodineanu, R.

R. Mavrodineanu, R. C. Hughes, T. R. Kohler, “Direct Reader for Flame Emission Measurements,” Philips Laboratories Tech. Rep. No. 173, 24June1964.

R. Mavrodineanu, “Atomizer and Burner Unit for Flame Emission and Atomic Absorption Spectroscopy,” Philips Laboratories Tech. Rep. No. 207, 20January1967.

Newton, I.

I. Newton, Opticks (Dover Publications, New York, 1952), p. 142, Fig. 7.

Walsh, A.

A. Walsh, U. S. Pat.2,847,899, 19August1958.

Other (4)

R. Mavrodineanu, R. C. Hughes, T. R. Kohler, “Direct Reader for Flame Emission Measurements,” Philips Laboratories Tech. Rep. No. 173, 24June1964.

I. Newton, Opticks (Dover Publications, New York, 1952), p. 142, Fig. 7.

A. Walsh, U. S. Pat.2,847,899, 19August1958.

R. Mavrodineanu, “Atomizer and Burner Unit for Flame Emission and Atomic Absorption Spectroscopy,” Philips Laboratories Tech. Rep. No. 207, 20January1967.

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Figures (5)

Fig. 1
Fig. 1

Schematic description of an optical arrangement for multichannel simultaneous atomic absorption and flame emission spectrophotometry. In Figs. 13, the order of the readout photopliers is schematic, only.

Fig. 2
Fig. 2

Schematic description of a compact optical arrangement for multichannel simultaneous atomic absorption and flame emission spectrophotometry. In this arrangement the flame is traversed twice by the optical beam. The two gratings are located one over the other. They are shown side by side in this sketch only to permit clear representation of the various optical paths.

Fig. 3
Fig. 3

Schematic description of an optical arrangement similar to that from Fig. 1 and Fig. 2, but using only one grating.

Fig. 4
Fig. 4

Illustration of an instrumental assembly as described in Fig. 1. Left: the analyzer, a six-channel spectrometer embodying a 1-m Féry quartz prism for the analysis of three signals in emission (K, Na, Ca) and three signals in atomic absorption (Cr, Ni, Mg). Right: the synthesizer, a 1-m quartz Littrow spectrograph used to combine the resonance radiations of Cr, Ni, and Mg emitted by individual hollow cathode tubes placed at the corresponding wavelengths at the focal plane. The flame, optical accessories, and gas control panel are located on the optical bench in between the analyzer and the synthesizer.

Fig. 5
Fig. 5

Nebulizer and burner assembly. The pneumatic nebulizer is of the indirect, external type; the water-cooled, interchangeable burner heads are used to produce premixed flames by acetylene–air, propane–air, acetylene–nitrous oxide, and propane–nitrous oxide. The nebulizer vessel and burner body are made of Teflon; the nebulizer and burner heads are made of 316 stainless steel.

Tables (1)

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Table I Percentage Standard Deviation Obtained in the Simultaneous Determination of K, Na, Ca by Flame Emission and Mg, Cr, Ni by Flame Atomic Absorption Spectrophotometrya

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