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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Electrochemical determination of para-nitrophenol at apatite-modified carbon paste electrode: Application in river water samples
Journal of Hazardous Materials, Volume 163, No. 1, Year 2009
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Description
The behavior of a modified carbon paste electrode (CPE) for para-nitrophenol detection by cyclic and square wave voltammetry (SWV) was studied. The electrode was built by incorporating the hydroxyapatite (HAP) to carbon paste. The overall analysis involved a two-step procedure: an accumulation step at open circuit, followed by medium exchange to a pure electrolyte solution for the voltammetric quantification. During the preconcentration step, para-nitrophenol was adsorbed onto hydroxyapatite surface. The influence of various experimental parameters on the HAP-CPE response was investigated (i.e. pH, carbon paste composition, accumulation time). Under the optimized conditions, the reduction peak shows that the peak height was found to be directly proportional to the para-nitrophenol concentration in the range comprised between 2 × 10-7 mol L-1 and 1 × 10-4 mol L-1. With this, it was possible to determine detection limit (DL), which resulted in 8 × 10-9 mol L-1 for peak 1. The proposed electrode (HAP-CPE) presented good repeatability, evaluated in term of relative standard deviation (R.S.D. = 2.87%) for n = 7 and was applied for para-nitrophenol determination in water samples. The average recovery for these samples was 86.2%. © 2008 Elsevier B.V. All rights reserved.
Authors & Co-Authors
El Mhammedi, Moulay Abderrahim
Morocco, Beni Mellal
Faculté Des Sciences et Techniques
Achak, Mounia
Morocco, Marakech
Faculté Des Sciences Semlalia
Bakasse, Mina
Morocco, El Jadida
Faculté Des Sciences D'el Jadida
Chtaini, Abdelilah
Morocco, Beni Mellal
Faculté Des Sciences et Techniques
Statistics
Citations: 147
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.jhazmat.2008.06.126
ISSN:
03043894
Research Areas
Environmental