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Simultaneous Determination of Hydroquinone and Catechol by Differential Alternative Pulses Voltammetry
Author(s) -
Ayala Alan,
Stoytcheva Margarita,
Zlatev Roumen,
Velkova Zdravka,
Gochev Velizar,
Valdez Benjamin,
Montero Gisela
Publication year - 2018
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.201800240
Subject(s) - hydroquinone , catechol , differential pulse voltammetry , detection limit , resorcinol , chemistry , voltammetry , analytical chemistry (journal) , electrode , phenol , cyclic voltammetry , electrochemistry , chromatography , organic chemistry
The second order voltammetric technique of high resolution, Differential Alternative Pulses Voltammetry (DAPV), was applied for the simultaneous determination of hydroquinone (HQ) and catechol (CC) on bare spectroscopic graphite electrode. Well resolved anodic and cathodic peaks situated on both sides of the zero line were obtained, while the differential pulse voltammograms were overlapped. The linear concentration range for HQ and CC quantification by DAPV was extended up to 20 μmol L −1 for both the isomers. The sensitivity of the determination was found to be 6.00 μA L μmol −1 and 3.61 μA L μmol −1 , while the limit of detection reached was 0.2 μmol L −1 and 0.5 μmol L −1 for HQ and CC, respectively. No interference was observed from the commonly coexisting organic species such as resorcinol, phenol and p‐benzoquinone. The great resolution power of DAPV permitted obtaining excellent results without any electrode modification and any mathematical data processing.