Issue 1, 2006

Linear PLS regression to cope with interferences of major concomitants in the determination of antimony by ETAAS

Abstract

Most heavy metals are present in trace concentrations in many matrices whereas concomitants are, generally, several orders of magnitude higher. Thus, when Sb was determined in water samples by electrothermal atomic absorption spectrometry (ETAAS), typical major concomitant ions Ca2+, Fe3+, Na+, Mg2+, Cl, PO43− and SO42− induced displacement, depletion and division of its atomic peak. These interferences were handled with partial least squares regression (PLS). Plackett–Burman experimental designs were implemented to develop the calibration matrix and assess which concomitants modified the atomic signal the most. Despite the concentration-dependent effects induced by the concomitants, linear PLS was a reliable way to predict the concentration of Sb in aqueous samples (standard error of prediction = 1.44 ng mL−1). Polynomial PLS regression was also studied but it did not outperform the linear models. The multivariate-derived figures of merit were calculated: sensitivity (0.014 absorbance/(ng mL−1)), characteristic mass (6.2 pg) and selectivity (using the net analyte signal concept, 83%); limit of detection (considering 5% of type-α and type-β risks, 5.6 ng mL−1) and quantification (10.6 ng mL−1), following recent IUPAC and ISO guidelines. The method was validated studying its robustness to current ETAAS problems and analysing several certified reference waters.

Graphical abstract: Linear PLS regression to cope with interferences of major concomitants in the determination of antimony by ETAAS

Supplementary files

Article information

Article type
Paper
Submitted
13 May 2005
Accepted
03 Nov 2005
First published
22 Nov 2005

J. Anal. At. Spectrom., 2006,21, 61-68

Linear PLS regression to cope with interferences of major concomitants in the determination of antimony by ETAAS

M. Felipe-Sotelo, M. J. Cal-Prieto, J. Ferré, R. Boqué, J. M. Andrade and A. Carlosena, J. Anal. At. Spectrom., 2006, 21, 61 DOI: 10.1039/B506783A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements