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The Voltammetry and Electroanalysis of Some Estrogenic Compounds at Modified Diamond Electrodes
Author(s) -
Gan Patrick,
Compton Richard G.,
Foord John S.
Publication year - 2013
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.201300362
Subject(s) - detection limit , diamond , adsorption , chemistry , electrode , cyclic voltammetry , voltammetry , carbon fibers , nonylphenol , inorganic chemistry , aqueous solution , bisphenol a , analytical chemistry (journal) , materials science , electrochemistry , chromatography , organic chemistry , composite material , composite number , environmental chemistry , epoxy
The voltammetry of some estrogenic compounds (estradiol, nonylphenol, bisphenol A, ethynylestradiol, estrone, estriol) in aqueous solution at boron doped diamond electrodes is reported. For oxidised (hydrophilic) electrodes electrochemically irreversible kinetics were observed for the diffusing molecules allowing the inference of diffusion coefficients and transfer coefficients. In contrast for hydrogen terminated (hydrophobic) surfaces significant adsorption was observed. A limit of detection of 1–100 µM for the estrogenic compounds was found using the oxidised diamond electrode. Surface modification of the oxidised diamond with nano‐Carbon (so‐called Carbon Black) allowed preconcentration of the target by adsorption onto the Carbon Black prior to analysis and a corresponding reduction of the limit of detection by ca three orders of magnitude to 5–100 nM.