“On-line Preconcentration of Cobalt in Drinking Water using a Minicolumn Packed with Activated Carbon Coupled to Electrothermal Atomic Absorption Spectrometric Determination”

S. CERUTTI, S. MOYANO, J. A. GÁSQUEZ, J. STRIPEIKIS AND L. D. MARTINEZ.

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY

Elsevier

Año: 2003 vol. 58 p. 2015 - 2021

0584-8547

An on-line flow injection preconcentration-electrothermal atomic absorption spectrometry method is developed for trace determination of cobalt in drinking water samples by sorption on a conical minicolumn packed with activated carbon at pH 9.5. The cobalt was eluted from the minicolumn with 10% (vyv) nitric acid. An enrichment factor of 190-fold for a sample volume of 10 ml was obtained. The detection limit (DL) value for the preconcentration method proposed was 5 ng l-1. The precision for 10 replicate determinations at the 50 ng l-1 Co level was 4.7% relative standard deviation. The calibration graph using the preconcentration system for cobalt was linear with a correlation coefficient of 0.9993 at levels near the DLs up to at least 0.35 ug l-1. The method was successfully applied to the determination of cobalt in drinking water samples.