Determination of Cu, Pb, Cd, and Zn in river sediment extracts by sequential injection anodic stripping voltammetry with thin mercury film electrode.
Fresenius J Anal Chem
; 367(3): 284-90, 2000 Jun.
Article
en En
| MEDLINE
| ID: mdl-11227460
Determination of Cu, Pb, Cd and Zn was performed in sediment extracts obtained according to the three steps sequential extraction procedure proposed by the European Community Standards, Measurements and Testing Program. The metal content was determined by anodic stripping voltammetry with a thin mercury film electrode controlled by a sequential injection (SIA) system. The proposed method improved the reproducibility of conventional anodic stripping voltammetry, as well as the sample throughput, allowing analysis of 30 to 45 samples per hour. The influence of flow rate and sample volume was studied to achieve an adequate sensitivity for the leachate studied. No interferences due to adsorption of organic matter, colloids, or complexes with slow rate of dissociation were observed. The intermetallic formation of Cu-Zn was avoided by forming the mercury film in presence of Ga(III) ions in the SIA system, resulting in low consumption of reagent in comparison to flow injection or continuous flow systems. Results were in good agreement with those obtained by Induced Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES).
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Sedimentos Geológicos
/
Metales Pesados
/
Agua Dulce
Tipo de estudio:
Diagnostic_studies
País/Región como asunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Fresenius J Anal Chem
Asunto de la revista:
QUIMICA
Año:
2000
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Alemania