TITLE

Simultaneous determination of phenylenediamine isomers and dihydroxybenzene isomers in hair dyes by capillary zone electrophoresis coupled with amperometric detection

AUTHOR(S)
Shuqing Dong; Langzhu Chi; Shan Zhang; Pingang He; Qingjiang Wang; Yuzhi Fang
PUB. DATE
May 2008
SOURCE
Analytical & Bioanalytical Chemistry;May2008, Vol. 391 Issue 2, p653
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The simultaneous determination of three isomers of phenylenediamines ( o, m, and p-phenylenediamine) and two isomers of dihydroxybenzenes (catechol and resorcinol) in hair dyes was performed by capillary zone electrophoresis coupled with amperometric detection (CZE–AD). The effects of working electrode potential, pH and concentration of running buffer, separation voltage, and injection time on CZE–AD were investigated. Under the optimum conditions the five analytes could be perfectly separated in 0.30 mol L−1 borate–0.40 mol L−1 phosphate buffer (pH 5.8) within 15 min. A 300 μm diameter platinum electrode had good responses at +0.85 V (versus SCE) for the five analytes. Their linear ranges were from 1.0 × 10−6 to 1.0 × 10−4 mol L−1 and the detection limits were as low as 10−7 mol L−1 ( S/ N = 3). This working electrode was successfully used to analyze eight kinds of hair dye sample with recoveries in the range 91.0–108.0% and RSDs less than 5.0%. These results demonstrated that capillary zone electrophoresis coupled with electrochemical detection using a platinum working electrode as detector was convenient, highly sensitive, highly repeatable and could be used in the rapid determination of practical samples. [Figure not available: see fulltext.]
ACCESSION #
31815246

 

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