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Electrochemical Behavior of Nicotine at Unmodified Carbon Paste Electrode and Its Determination in a Set of Refilling Liquids for Electronic Cigarettes
Author(s) -
Stočes Matěj,
Švancara Ivan
Publication year - 2014
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.201400403
Subject(s) - nicotine , chemistry , electrochemistry , phosphate buffered saline , redox , electrode , carbon paste electrode , electroanalytical method , carbon fibers , reproducibility , buffer solution , analytical chemistry (journal) , inorganic chemistry , chromatography , cyclic voltammetry , materials science , composite material , neuroscience , composite number , biology , potentiometric titration
In this manuscript, a carbon paste electrode (CPE) from traditional components has been used to study the electrochemical oxidation of nicotine and its feasibility to be performed at unmodified and otherwise untreated carbon paste in an effort to propose a simple voltammetric method for the determination of nicotine in samples of refilling liquids for electronic cigarettes. As found out, irreversible oxidation of nicotine at CPE had occurred at −0.95 V vs. Ag/AgCl as a diffusion‐controlled process, when suitable pH for this redox transformation was either a neutral supporting medium (phosphate buffer, pH 7.5) or mild alkaline solution (of Britton‐Robinson buffer, pH 11). After having chosen the SWV mode and optimizing the key instrumental and electroanalytical parameters, the oxidation response of the substance of interest has been fairly proportional to concentration in the range of 50–500 µmol L −1 in phosphate buffer or even 50–1000 µmol L −1 in BrittonRobinson buffer. And if the reproducibility could substantially be improved by incorporating an effective conditioning step, the method could be applied for the determination of nicotine in real samples of refilling liquids for electronic cigarette with satisfactory results corresponding well to the values declared by manufacturer.