Non‐Invasive Salivary Electrochemical Quantification of Paraquat Poisoning Using Boron Doped Diamond Electrode |
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| Authors: | Thiago Matheus Guimarães Selva William Reis?de?Araujo Thiago Regis Longo Cesar?da?Paixão |
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| Affiliation: | 1. Instituto Federal de Educa??o, Ciência e Tecnologia de Pernambuco, Av. Prof. Luís Freire, 500 – Cidade Universitária, Recife – PE, 50740‐540;2. Universidade de S?o Paulo, Instituto de Química, Av. Prof. Lineu Prestes, 748, S?o Paulo – SP, 05508‐000 |
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| Abstract: | The present work describes the first electrochemical method for quantifying paraquat herbicide poisoning in human saliva samples. Paraquat shows two couples of well‐defined peaks in aqueous solution using a boron doped diamond (BDD) electrode. By using square wave voltammetry (SWV) technique under optimum experimental conditions, a linear analytical curve was obtained for paraquat concentrations ranging from 0.800 to 167 µmol L?1, with a detection limit of 70 nmol L?1. This method was applied to quantify paraquat spikes in human saliva samples and in two different water samples (tap and river). The recovery values obtained ranged from 83.0 to 104 % and 99.1 to 105 %, respectively, which highlight the accuracy of the proposed method. |
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| Keywords: | Paraquat Water samples Human saliva Boron doped diamond Square wave voltammetry |
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