ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Possibility to eliminate interferences of mineral acids in optical emission spectroscopy with inductively coupled plasma

J. Kubová and V. Streško

Geological Institute, Faculty of Natural Sciences, Comenius University, CS-842 15 Bratislava

Abstract: In the present paper the influence of HCl, HNO₃, H₃PO₄, and H₂SO₄ on the determination of Cd, Cr, Cu, Pb, and Zn has been evaluated. At higher acid concentrations a partial elimination of their depressive influence on the intensity of spectral lines can be achieved by an appropriate choice of the observation height, different from its commonly used value (optimized for the maximum signal to background ratio).It is true that the detection limit is worsened by the procedure, but at the claim for accurate determinations of contents exceeding considerably the limit of detection it does not play primary role. Experimentally obtained results were checked by the analysis of attested reference geological materials.The described method enabling a lowering of the interference of acid matrix is not pretentious concerning the duration of the analysis and it does not require any additional sample treatment.

Full paper in Portable Document Format: 455a615.pdf

Chemical Papers 45 (5) 615–624 (1991)