Title of article :
Electrochemical sensors using modified electrodes based on copper complexes formed with Algerian humic acid modified with ethylenediamine or triethylenetetramine for determination of nitrite in water
Author/Authors :
A. and Ait-Ramdane-Terbouche، نويسنده , , Chafia and Terbouche، نويسنده , , Achour and Djebbar، نويسنده , , Safia and Hauchard، نويسنده , , Didier، نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2014
Pages :
12
From page :
214
To page :
225
Abstract :
The response and efficiency of new sensors for nitrite ions analysis have been studied electrochemically. These sensors were developed by modifying a carbon paste electrode (CPE) with copper (II) complexes formed with commercial (PFHA) and Algerian (YHA) humic acids and their modified compounds with ethylenediamine (EDA) or triethylenetetramine (TETA). The developed mechanism is based on the electrochemical oxidation of NO2− on the modified CPE for different nitrite concentrations. The obtained results showed that the carbon paste electrode modified with copper (II)–modified humic acids complexes (Cu–MHA) exhibited substantial electrocatalytic effect on the oxidation of nitrite anions compared with carbon paste electrode. The sensitivity of the modified CPE towards nitrite concentrations depends on the nature of the humic acid and its modified compounds. The measurements performed by using CPE/Cu–YHA-EDA and CPE/Cu–YHA-TETA gave the best sensitivity and a good linear response of current versus nitrite concentrations. idation peak current of nitrite at CPE/Cu–YHA-TETA and CPE/Cu–YHA-EDA electrodes in weak acid solution is proportional to the concentration of nitrite over the range 0–1.38×10−2 mol L−1 with a limit of detection ( LOD ) of 1.46 μmol L−1 ( Sensitivity = 41.06 μ A ( mmol L − 1 )−1 and 2.17 μmol L−1 ( Sensitivity = 27.63 μ A ( mmol L − 1 )−1, respectively. Compared to the sensors published in the literature, our CPE/Cu–YHA-TETA and CPE/Cu–YHA-EDA electrodes exhibit a good catalytic activity towards nitrite oxidation and a low limit of detection over a wide nitrite concentrations range.
Keywords :
Modified Algerian humic acid , Copper complexes , Detection of nitrite , Electrochemical sensors
Journal title :
Talanta
Serial Year :
2014
Journal title :
Talanta
Record number :
1669838
Link To Document :
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