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Non‐Invasive Salivary Electrochemical Quantification of Paraquat Poisoning Using Boron Doped Diamond Electrode
Author(s) -
Selva Thiago Matheus Guimarães,
Reis de Araujo William,
Cesar da Paixão Thiago Regis Longo
Publication year - 2015
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.201400745
Subject(s) - paraquat , diamond , detection limit , tap water , electrode , materials science , electrochemistry , aqueous solution , voltammetry , analytical chemistry (journal) , chemistry , chromatography , metallurgy , environmental science , environmental engineering , biochemistry
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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