A COMPARATIVE STUDY OF INDUCTIVELY COUPLED PLASMA OPTICAL EMISSION SPECTROMETRY AND MICROWAVE PLASMA ATOMIC EMISSION SPECTROMETRY FOR THE DIRECT DETERMINATION OF LANTHANIDES IN WATER AND ENVIRONMENTAL SAMPLES
Evelina Varbanova, Violeta Stefanova
Pages: 362-374 Published: 28 May 2015
Views: 2,397 Downloads: 1,434
Abstract: A new instrumental technique – Microwave Plasma Atomic Emission Spectrometry (MP-AES) is compared to conventional Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) for direct determination of lanthanides. Estimation of both methods is done using standard measurement conditions. The present study includes spectral and non-spectral matrix effect evaluation. Tested analytical wavelengths of lanthanides are divided into three groups: 1) relatively free, 2) interfered by other lanthanides and 3) interfered by concomitant elements. Non spectral effect on analytes is examined in two typical real matrices – acidic plant digests and saline water. The capabilities of both plasma methods for quantitative determination of La, Ce, Sm, Eu, Gd and Er are compared. The interference-free emission lines are selected; appropriate background correction is proposed and the corresponding instrumental detection limits are calculated.
Keywords: lanthanides, icp-oes, mp-aes, spectral and non-spectral interference