Sage Journals: Discover world-class research

Abstract

Measurements are reported for the absorption of the 422.7 nm line of a natural-abundance calcium hollow cathode lamp by solutions of ⁴⁰Ca, ⁴⁴Ca, and ⁴⁸Ca at 0.5 to 3.0 ppm levels in 0.06 M HCl (aqueous) when aspirated into air-acetylene and nitrous oxide-acetylene flames. In the case of the air-acetylene flame the relative absorptions per mole of calcium in solution were 1.00, 1.11, and 1.08 for the 40, 44, and 48 isotopes, respectively. With the nitrous oxide-acetylene flame similar experiments gave ratios of 1.00, 1.08, and 1.06 in the same order. These results may be rationalized with a model that considers the simultaneous effects of isotope shifting, Lorentz broadening and shifting, and Doppler broadening of the calcium resonance line in the flame. With the air-acetylene flame, solutions that also contained 5000 ppm of Sr as SrCl₂ gave relative absorbances for the 40, 44, and 48 calcium isotopes of 1.00, 1.04, and 1.10. Flame-atomic-distribution studies lead to the conclusion that in the presence of 5000 ppm of Sr, calcium kinetic isotope effects are also important.

Keywords

Calcium atomic absorption Calcium isotope effects Spectral line broadening

Get full access to this article

View all access options for this article.

References

Ramirez-Munoz

, Atomic Absorption Spectroscopy (Elsevier, New York, 1968), pp. 307–308.

Davidson

, Statistical Mechanics (McGraw-Hill, New York, 1962), p. 143.

American Institute of Physics Handbook, Gray

D. E.

, Ed. (McGraw-Hill, New York, 1972), 3rd ed., p. 7–173.

L'vov

B. V.

, Atomic Absorption Spectrochemical Analysis (American Elsevier, New York, 1970), Ch. 1.

Penner

S. S.

, Quantitative Molecular Spectroscopy and Gas Emissivities (Addison-Wesley, Reading, MA, 1959), Ch. 3 and 4.

Breene

R. G.

Jr. , Rev. Mod. Phys. 29, 94 (1957).

Ch'en

and Takeo

, Rev. Mod. Phys. 29, 20 (1957).

Epstein

G. L.

and Davis

S. P.

, Phys. Rev. A4, 464 (1971).

Hinnov

and Kohn

, J. Opt. Soc. Am. 47, 151 (1957).

10.

Hollander

Jansen

B. J.

Plaat

J. J.

, and Alkemade

C. T. J.

, J. Quant. Spectrosc. Radiat. Trans. 10, 1301 (1970).

11.

Kirkbright

G. F.

and Troccoli

O. E.

, Spectrochim. Acta 28B, 33 (1973).

12.

Wagenaar

H. C.

Pickford

C. J.

, and de Galan

, Spectrochim. Acta 29B, 211 (1974).

13.

Wagenaar

H. C.

and de Galan

, Spectrochim. Acta 28B, 157 (1973).

14.

Lovett

R. J.

and Parsons

M. L.

, Appl. Spectrose. 31, 424 (1977).

15.

L'vov

B. V.

Katskov

D. A.

Kruglikova

L. P.

, and Polzik

L. K.

, Spectrochim. Acta 31B, 49 (1976).

16.

Posener

D. W.

, Aust. J. Phys. 12, 184 (1959).

17.

Bruce

C. F.

and Hannaford

, Spectrochim. Acta 26B, 207 (1971).

18.

Willis

J. B.

, Anal. Chem. 33, 556 (1961).

19.

Ulrich

W. F.

and Ramirez-Munoz

, ASTM Special Technical Publication 443 (American Society for Testing and Materials, Philadelphia, PA, 1969), p. 90.

20.

Rocchiccioli

and Townshend

, Anal. Chim. Acta 41, 93 (1968).

21.

Roos

J. T. H.

, Spectrochim. Acta 26B, 285 (1971).

22.

Halls

D. J.

, Anal. Chim. Acta 88, 69 (1977).

23.

Harrison

and Ottaway

J. M.

, Proc. Soc. Anal. Chem. 9, 205 (1972).

24.

Ottaway

J. M.

, Proc. Soc. Anal. Chem. 13, 185 (1976).

Calcium Isotope Effects in Atomic Absorption

Abstract

Keywords

Get full access to this article

References