Determination of lead in waters and sediments from the wetland Tablas de Daimiel National Park (Spain) |
| |
Authors: | J J Berzas Nevado L F García Bermejo and R C Rodríguez Martín-Doimeadios |
| |
Institution: | (1) Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, E-13071 Ciudad Real, Spain e-mail: jjberzas@qata-cr.uclm.es, Tel.: 34 (9)26-29 53 00, Fax: 34-(9)26 29 53 18, ES |
| |
Abstract: | Electrothermal atomic absorption spectrometry (ETAAS) has been used for lead control in waters and sediments of the wetland
Tablas de Daimiel National Park. The lead determination in the wetland water is hindered by an enhanced salt content, so matrix interference was evaluated.
The use of stabilized temperature platform atomization technique, Zeeman background correction and palladium nitrate as matrix
modifier were found advisable. For the sediments a closed-vessel microwave dissolution method has been proposed using a mixture
of HCl-HNO3-HF and a heating time of 90 s. With subsequent ETAAS using platform atomization and Zeeman background correction, no chemical
modification was necessary. Using these conditions, the interferences were completely removed for both waters and sediments
and the calibration curve in ultrapure water (1% nitric acid) was linear up to 30 μg/L. The detection limits for waters and
sediments were 0.95 μg/L and 0.78 μg/g, respectively. The accuracy of the proposed method for sediments was validated by analyzing
certified reference materials (obtained values were within the certified ones) and spiked wetland sediments (mean recovery
of 99.0%).
Received: 11 October 1998 / Revised: 3 December 1998 / Accepted: 11 March 1999 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|