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Study on Diffusion Mechanisms and Determination of Dihydroxybenzene Isomers at the Pre‐anodized Inlaying Ultrathin Carbon Paste Electrode
Author(s) -
Huo Jinge,
Shangguan Enbo,
Wang Qiaotian,
Li Quanmin
Publication year - 2013
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201200376
Subject(s) - chemistry , hydroquinone , resorcinol , electrode , catechol , electrochemistry , diffusion , anodizing , analytical chemistry (journal) , carbon fibers , working electrode , inorganic chemistry , organic chemistry , aluminium , physics , materials science , composite number , composite material , thermodynamics
In this paper, nichrome was adopted as a substrate, to fabricate the pre‐anodized inlaying ultrathin carbon paste electrode (PAIUCPE). The electrochemical behaviors and diffusion mechanisms of three dihydroxybenzene isomers at the electrode were carefully investigated. The effect of pH on oxidation peak current was also detailedly explained. The results were shown that oxidation peak current not only related to the reaction of electroactive materials at the working electrode, but also depended on the reaction variable of reduction at the auxiliary electrode. The oxidation peaks of hydroquinone (HQ), catechol (CC) and resorcinol (RC) located at 0.181 V, 0.288 V and 0.736 V. For CC, RC and HQ, the oxidation peak currents were linear to the concentrations at the range of 5.0 × 10 −6 ∼5.0 × 10 −4 mol/L, 3.0 × 10 −6 ∼5.0 × 10 −4 mol/L and 4.0 × 10 −6 ∼4.0 × 10 −4 mol/L with the detection limits of 2.0 × 10 −7 mol/L, 1.2 × 10 −7 mol/L and 1.2 × 10 −7 mol/L, respectively. The proposed method was successfully applied in the simultaneous determination of dihydroxybenzene isomers in artificial sewage samples with satisfactory results.