Carbon Paste Electrode Modified with Biochar for Sensitive Electrochemical Determination of Paraquat | Zendy

Kalinke Cristiane | Zendy; Mangrich Antonio S. | Zendy; MarcolinoJunior Luiz H. | Zendy; Bergamini Márcio F. | Zendy

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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.

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