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

Determination of As(III) and total as in water by graphite furnace atomic absorption spectrometry after electrochemical preconcentration on a gold-plated porous glassy carbon electrode

M. Střelec, F. Čacho, A. Manová, and E. Beinrohr

Faculty of Chemical and Food Technology, Institute of Analytical Chemistry, Slovak Technical University, Radlinského 9, 812 37 Bratislava, Slovakia

E-mail: ernest.beinrohr@stuba.sk

Received: 23 January 2007  Revised: 15 June 2007  Accepted: 22 June 2007

Abstract: Arsenic(III) was preconcentrated in a flow-through electrochemical cell on a gold coated porous carbon electrode. On stripping, arsenic was eluted with diluted nitric acid and determined off-line by GF AAS. The deposition and stripping steps were optimized. The limit of detection and limit of quantification were found to be 1.9 µg L⁻1 and 6.4 µg L⁻¹, respectively. The repeatability and reproducibility were found to be 5.3 % and 9.3 %, respectively. Total arsenic was determined after a microwave assisted chemical reduction of As(V) to As(III) making the procedure suitable for speciation analysis. The method was applied in analysis of water samples.

Keywords: electrochemical preconcentration - speciation - arsenic - flow-through cell - GF AAS

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-007-0061-0

Chemical Papers 61 (6) 452–456 (2007)