Document Detail

Characterization of a carbon paste electrode modified with tripolyphosphate-modified kaolinite clay for the detection of lead.
MedLine Citation:
PMID:  21807195     Owner:  NLM     Status:  In-Data-Review    
We report about the use of carbon paste electrode modified with kaolinite for analytical detection of trace lead(II) in domestic water by differential pulse voltammetry. Kaolinite clay was modified with tripolyphosphate (TPP) by impregnation method. The results show that TPP in kaolinite clay plays an important role in the accumulation process of Pb(II) on the modified electrode surface. The electroanalytical procedure for determination of Pb(II) comprised two steps: chemical accumulation of the analyte under open-circuit conditions, followed by electrochemical detection of the pre-concentrated species using differential pulse voltammetry. The analytical performance of this system has been explored by studying the effects of preconcentration time, carbon paste composition, pH, supporting electrolyte concentration, as well as interferences due to other ions. The calculated detection limit based on the variability of a blank solution (3s(b) criterion) for 10 measurements was 8.4×10(-8)molL(-1), and the sensitivity determined from the slope of the calibration graph was 0.910molL(-1). The reproducibility (RSD) for five replicate measurements at 1.0mgL(-1) lead level was 1.6%. The results indicate that this electrode is sensitive and effective for the determination of Pb(2+).
Yoleydis Gómez; Lenys Fernández; Carlos Borrás; Jorge Mostany; Benjamín Scharifker
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Publication Detail:
Type:  Journal Article     Date:  2011-06-15
Journal Detail:
Title:  Talanta     Volume:  85     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-08-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  1357-63     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Departamento de Química, Universidad Simón Bolívar, Apartado 89000, Caracas 1080-A, Venezuela.
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