Matrix interferences in determination of selenium by inductively coupled plasma - atomic emission spectrometry

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Authors

MACHÁT Jiří OTRUBA Vítězslav KANICKÝ Viktor

Year of publication 2002
Type Article in Proceedings
Conference 2002 Winter Conference on Plasma Spectrochemistry
MU Faculty or unit

Faculty of Science

Citation
Field Analytic chemistry
Keywords matrix interference; spectral interference; selenium; ICP-OES; signal enhancement
Description Spectral and non-spectral interferences observed at the determination of selenium by ICP-OES were investigated in this study. The identity of the carbon-induced emission peak that interferes on the Se 196.090 nm analytical line has been revised. It has been found that this peak is not a part of a CN band but it belongs most likely to a spectral band emitted by CO molecule. Non-spectral interferences of matrix elements C, S, P and Br consisting in the enhancement of selenium emission have been found. Concentration dependences of these matrix effects were measured in the range of 0.5 - 20 g.l-1 of matrix element and 0.1 - 100 mg.l-1 of Se. The enhancement of selenium emission was about 50% in the most significant case (sulfur 10 g.L-1). Similar effect was observed when gaseous compounds of C and S were introduced into the ICP. Mechanism of this matrix effect was studied and partially clarified as probably related to ionization of matrix elements.
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