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Compensation of Ca and Na Interference Effects in Axially and Radially Viewed Inductively Coupled Plasmas.pdf
Microchemical Journal 63, 344 –355 (1999) Article ID mchj.1999.1800, available online at on
Compensation of Ca and Na Interference Effects in Axially and Radially Viewed Inductively Coupled Plasmas
I. B. Brenner,*,1 A. Le Marchand,? C. Daraed,? and L. Chauvet?
*Environmental Analytical Laboratory, Ben Gurion University, Beersheva, Israel; and ?Jobin Yvon-Horiba, 16 –18 rue du Canal, 91160 Longjumeau Cedex, France
Received December 7, 1998; accepted July 1, 1999
The linear relationship between Ca and Na interferences and energy potentials for a wide range of atomic and ionic lines is used to compensate for variable intensity suppression in robust axially and radially viewed inductively coupled plasmas (ICPs). In the axial con?guration, intensity attenuation varied from 0 to 40% in the presence of 0.5% Ca and Na. In the radially viewed ICP, interferences were smaller, varying from 5 to 15% for 0.5% Na and from 10 to 30% for 0.5% Ca. Signal attenuation was broadly a linear function of the energies of the spectral lines. These linear functions were estimated by using spectral lines covering the energy range from Sb I 206.833 (5.98 eV), Y II 371.209 and Sc II 361.384 (9.9 eV), Sc II 255.237 (11.42 eV), and Be II 313.042 (13.28 eV) nm. These functions were then used as variable internal standards to compensate for Ca, Na, and mixed Ca–Na matrix effects. Whereas analyte recoveries without compensation varied from about 40 to 90%, they varied mostly from 100 ? 5% when these functions were used. In the presence of Ca and Na, the Mg II 280.270/Mg I 285.213 nm intensity ratio decreased from about 12 for an aqueous solution to 9 at 1.5 kW. Such values con?rm that the radially and axially viewed ICPs were robust. ? 1999 Academic
Press
INTRODUCTION
The axially viewed inductively coupled plasma with atomic emission (ICP-AES) has become accepted for the analysis of environmental samples owing to the 2- to 20-fold improvement in limits of detection (1–9). However, solute vaporizati
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