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Abstract

An unambiguous comparison has been made of the spatial features of a 27.12 and a 40.68 MHz inductively coupled plasma. Experiments were carried out with a switchable-frequency, solid-state radio-frequency generator from the Leco 2000 system. Several features of analytical significance have been evaluated in a spatially resolved fashion. Results from optimization of the magnesium ion-to-atom (Mg II/Mg I) line-intensity ratio have been compared. The volume of the two discharges was estimated from molecular nitrogen-ion emission, and a spatially resolved map of the Fe(I) excitation temperature was determined by means of a Boltzmann analysis at each spatial location. Calcium and magnesium ion-to-atom line-intensity ratios have been calculated throughout both plasmas. Finally, limits of detection are presented. The results indicate that the plasma operated at 40.68 MHz provides slightly better figures of merit, although fundamental parameters suggest a lower degree of analyte excitation. This difference is explained by examining the results of a simulation of plasmas operated at 27.12 and 40.68 MHz.

Keywords

ICP Operating frequency Analytical performance Detection limits

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References

Alder

J. F.

Bombelka

R. M.

and Kirkbright

G. F

, Spectrochim. Acta, Part B 35, 163 (1980).

Boumans

P. W. J. M.

and De Boer

F. J

, Spectrochim. Acta, Part B 31, 355 (1976).

Brushwyler

K. R.

and Hieftje

G. M

, Appl. Spectrosc. 46, 1098 (1992).

Capelle

Mermet

J. M.

and Robin

, Appl. Spectrosc. 36, 102 (1982).

Gunter

Visser

and Zeeman

P. B

, Spectrochim. Acta, Part B 40, 617 (1985).

Gunter

W. H.

Visser

and Zeeman

P. B

, Spectrochim. Acta, Part B 38, 949 (1983).

Michaud-Poussel

and Mermet

J. M

, Spectrochim. Acta, Part B 42, 1163 (1987).

Vickers

G. H.

Wilson

D. A.

and Hieftje

G. M

, J. Anal. At. Spectrom. 4, 749 (1989).

Webb

B. D.

and Denton

M. B

, Spectrochim. Acta, Part B 41, 361 (1986).

10.

Boumans

P. W. J. M.

and Vrakking

J. J. A. M

, Spectrochim. Acta, Part B 42, 553 (1987).

11.

Monnig

C. A.

Gebhart

B. D.

Marshall

K. A.

and Hieftje

G. M

, Spectrochim. Acta, Part B 45, 261 (1990).

12.

Mermet

J. M.

, Anal. Chim. Acta 250, 85 (1991).

13.

Galley

P. J.

Horner

J. A.

and Hieftje

G. M

, Spectrochim. Acta, Part B 50, 87 (1993).

14.

Boumans

P. W. J. M.

, “Basic Concepts and Characteristics”, in Inductively Coupled Plasma Emission Spectroscopy Part I: Methodology, Instrumentation and Performance (Wiley–Interscience, New York, 1987).

15.

Boulos

M. I.

Fauchais

and Pfender

, Thermal Plasmas: Fundamentals and Applications (Plenum Press, New York, 1994), p. 452.

16.

Boulos

M. I.

and Barnes

R. M

, “Plasma Modeling and Computer Simulation”, in Inductively Coupled Plasma Emission Spectroscopy. Part II: Applications and Fundamentals (Wiley–Interscience, New York, 1987).

17.

Mostaghimi

Proulx

and Boulos

M. I

, Plasma Chem. Plasma Process. 4, 199 (1984).

18.

Mostaghimi

Proulx

and Boulos

M. I

, J. Numerical Heat Transfer 8, 187 (1985).

19.

Mostaghimi

and Boulos

M. I

, Plasma Chem. Plasma Process. 9, 25 (1989).

20.

Yang

Horner

J. A.

Sesi

N. N.

and Hieftje

G. M

, Spectrochim. Acta, Part B, submitted.

21.

Fuhr

J. R.

and Weise

W. L

, “Atomic Transition Probabilities”, in The Handbook of Chemistry and Physics (CRC Press, Ann Arbor, Michigan, 1990).

22.

O'Brian

T. R.

Wickliffe

M. E.

Lawler

J. E.

Whaling

and Brault

J. W

, J. Opt. Soc. Am. B 8, 1185 (1991).

23.

Burton

L. L.

and Blades

M. W

, Spectrochim. Acta, Part B 46, 819 (1991).

24.

Olesik

, Spectrochim. Acta, Part B 44, 625 (1989).

Effect of Operating Frequency on Spatial Features of the Inductively Coupled Plasma

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