Determination of hydroquinone in a square wave voltammetry procedure using a graphite-polyurethane composite electrode

Cervini, Priscila; Cavalheiro, Éder Tadeu Gomes

doi:10.1590/s0100-46702006000400009

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…29 The purpose of this work is to investigate the voltammetric behavior and the possibility of TC determination using a 60% (graphite, m/m) bare graphite-polyurethane composite (GPU) electrode in environmental water samples. This composite was proposed 30 and showed to be sensitive and useful in differential pulse voltammetry (DPV), 31 square wave voltammetry (SWV) 32 and as an amperometric detector in flow injection analysis 33 of antihypertensives.…”

Section: Introductionmentioning

confidence: 99%

Determination of tetracycline in environmental water samples at a graphite-polyurethane composite electrode

Calixto¹,

Cervini²,

Cavalheiro³

2012

J. Braz. Chem. Soc.

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O eletrodo compósito grafite-poliuretana foi avaliado na determinação de tetraciclina (TC) em amostras de água natural. Utilizando voltametria de pulso diferencial (DPV), uma resposta linear foi observada no intervalo de 4,00-40,0 µmol L-1 com limite de detecção de 2,80 µmol L-1 , sem necessidade de renovação da superfície entre medidas sucessivas. Durante determinação de tetraciclina em amostras de água, foram obtidas recuperações entre 92,6 e 100%. Os resultados para determinação de TC em amostras de água após a etapa de pré-concentração concordam com valor adicionado em um nível de confiança de 95% de acordo com o teste t-student. A bare graphite-polyurethane composite was evaluated in the tetracycline (TC) determination in natural water samples. Using differential pulse voltammetry (DPV), a linear response was observed in the range of 4.00-40.0 µmol L-1 with limit of detection of 2.80 µmol L-1 , without the need of surface renewing between successive runs. During the tetracycline determination in water samples, recoveries between 92.6 and 100% were found. The results for TC determination in water samples after a pre-concentration stage agreed with spiked value at a 95% confidence level according to student t-test.

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Section: Introductionmentioning

confidence: 99%

Determination of tetracycline in environmental water samples at a graphite-polyurethane composite electrode

Calixto¹,

Cervini²,

Cavalheiro³

2012

J. Braz. Chem. Soc.

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“…Composite electrodes have been prepared from graphite and polyurethane (PU) derived from castor oil, and have been used to determine several organic [4][5][6] and inorganic analytes [7], including copper in ethanolic fuels [8] and spirits [7]. Our idea in such papers was to demonstrate the usefulness of the composite in different shapes and applications, once it is prepared from a liquid bicomponent polymer, that allows such possibilities.…”

mentioning

confidence: 99%

“…In previous work, we used a graphite-polyurethane composite electrode in a conventional rod format [4][5][6], and we recently proposed a screen-printed device in which graphite-polyurethane was the basis of an ink used to prepare the working and auxiliary electrodes, as well as the electrical contacts of the reference electrode [35][36][37]. Different to the earlier work, in the present study the ink was modified with 2-benzothiazole-2-thiol organofunctionalized SBA-15 silica prior to the curing process.…”

mentioning

confidence: 99%

Simultaneous Voltammetric Determination of Zn(II), Pb(II), Cu(II), and Hg(II) in Ethanol Fuel Using an Organofunctionalized Modified Graphite‐Polyurethane Composite Disposable Screen‐Printed Device

2014

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A disposable screen‐printed device containing working, auxiliary, and reference electrodes is proposed for the simultaneous voltammetric determination of Zn(II), Pb(II), Cu(II), and Hg(II) in ethanol fuel. The working electrode was printed using an ink modified with 2‐benzothiazole‐2‐thiol organofunctionalized SBA‐15 silica, in order to increase sensitivity. The performance of this electrode was compared with that of bare and SBA‐15‐modified electrodes. After optimizing the experimental parameters, the device was applied in determination of the analytes in commercial ethanol fuel samples, using 0.10 mol L−1 KCl/ethanol ratios of 30 : 70 (v/v), with [H+]=10−5 mol L−1. After 5 min of preconcentration at − 1.3 V (vs. pseudo‐Ag/AgCl), four well‐resolved signals were obtained, enabling simultaneous determination of the four analytes using a differential pulse anodic stripping voltammetry (DPASV) procedure. The limits of detection were 0.30, 0.065, 0.030, and 0.046 µmol L−1 for Zn(II), Pb(II), Cu(II), and Hg(II), respectively. The results of these analyses were in agreement with those obtained using graphite furnace atomic absorption spectroscopy (GFAAS) for Pb(II), Cu(II), and Hg(II), and high‐resolution continuum source flame atomic absorption spectrometry (HR‐CS‐FAAS) for Zn2+, at a 95 % confidence level. Analytes originally present in the samples could be detected, and the interference of some cations and anions was evaluated.

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“…While chromatography methods is a good option for the determination of hydroquinone, the procedure are time-consuming and requires complicated pretreatment. Due to the high sensitivity, rapid analysis and simple pretreatment [6], electrochemical method has been widely used in the determination of hydroquinone [5,7,8]. However, some of the previous methods often involves modification of electrode that require complicated procedure and the use of conventional electrode require large volume of analyte.…”

Section: Introductionmentioning

confidence: 99%

Determination of Hydroquinone in a Square Wave Voltammetry based on Screen Printed Carbon Electrode

Safitri

Mulyasuryani

Tjahjanto

2015

J. Pure App. Chem. Res.

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Hydroquinone is a phenolic compound are often used extensively in the cosmetics industry as whitening agent. This compound is very toxic and their use should be monitored. Due to the impact of hydroquinone, the use of hydroquinone restricted by BPOM (Food and Drug Regulatory Department in Indonesia) maximum by 0.02%. The aim of this study was to establish a new simple sensitive voltammetry method for determination of hydroquinone using screen printed carbon electrode (spce). In this study, linear concentration range, limit of detection, sensitivity and accuracy were investigated. Before the determination of parameters analysis, the method require the optimization of method parameters such as frequency and pulse height. This study were showed that the measurement of hydroquinone with square wave voltammetry method has linear concentration range 1-100µM, limit of detection 23.4µM, sensitivity 0.075µM/µA and accuracy 0.9969. The proposed method was succesfully applied in whitening cream cosmetic samples with good enough results.

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Determination of hydroquinone in a square wave voltammetry procedure using a graphite-polyurethane composite electrode

Cited by 6 publications

References 24 publications

Determination of tetracycline in environmental water samples at a graphite-polyurethane composite electrode

Determination of tetracycline in environmental water samples at a graphite-polyurethane composite electrode

Simultaneous Voltammetric Determination of Zn(II), Pb(II), Cu(II), and Hg(II) in Ethanol Fuel Using an Organofunctionalized Modified Graphite‐Polyurethane Composite Disposable Screen‐Printed Device

Determination of Hydroquinone in a Square Wave Voltammetry based on Screen Printed Carbon Electrode

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