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Square‐Wave Voltammetric Determination of Paraquat at Carbon Paste Electrode Modified with Hydroxyapatite
Author(s) -
El Mhammedi Moulay Abderrahim,
Bakasse Mina,
Chtaini Abdelilah
Publication year - 2007
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200703927
Subject(s) - paraquat , square wave , carbon paste electrode , detection limit , redox , electrode , voltammetry , analytical chemistry (journal) , chemistry , carbon fibers , nuclear chemistry , materials science , electrochemistry , cyclic voltammetry , chromatography , inorganic chemistry , composite material , composite number , organic chemistry , physics , quantum mechanics , voltage
The voltammetric behavior of paraquat was investigated at hydroxyapatite‐modified carbon paste electrode HAP‐CPE in K 2 SO 4 . A method was developed for the detection of the trace of this herbicide, based on their redox reaction. The reduction peaks of paraquat were observed around −0.70 V and −1.00 V (vs. SCE) in square‐wave voltammetry. Experimental conditions were optimized by varying the accumulation time, apatite loading and measuring solution pH. Calibration plots were linear under the optimized parameters over the herbicide's concentration range 8–200×10 −7 mol L −1 , with a detection and quantification limits about 1.5×10 −8 mol L −1 and 6.4 10 −8 mol L −1 , respectively.