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Carbon Paste Electrode Modified with Biochar for Sensitive Electrochemical Determination of Paraquat
Author(s) -
Kalinke Cristiane,
Mangrich Antonio S.,
MarcolinoJunior Luiz H.,
Bergamini Márcio F.
Publication year - 2016
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.201500640
Subject(s) - biochar , detection limit , paraquat , differential pulse voltammetry , carbon paste electrode , electrode , adsorptive stripping voltammetry , chemistry , electrochemistry , carbon fibers , stripping (fiber) , supporting electrolyte , voltammetry , nuclear chemistry , chromatography , materials science , cyclic voltammetry , pyrolysis , composite material , organic chemistry , composite number
The present work reports for the first time the determination of paraquat (PQ 2+ ) by Differential Pulse Adsorptive Stripping Voltammetry (DPAdSV) using a carbon paste electrode modified (CPME) with biochar obtained from castor oil cake at different temperatures (200–600 °C). The best voltammetric response was verified using biochar yielded at 400 °C (CPME‐BC400). Linear dynamic range (LDR) for PQ 2+ concentrations between 3.0×10 −8 and 1.0×10 −6 mol L −1 and a limit of detection (LOD) of 7.5×10 −9 mol L −1 were verified. The method was successfully applied for PQ 2+ quantification in spiked samples of natural water and coconut water.