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Titolo:
Simultaneous determination of nitrobenzene and nitro-substituted phenols by differential pulse voltammetry and chemometrics
Autore:
Ni, Y; Wang, L; Kokot, S;
Indirizzi:
Nanchang Univ, Dept Chem, Jiangxi 330047, Nanchang, Peoples R China Nanchang Univ Jiangxi Nanchang Peoples R China 330047 ng, Peoples R China Queensland Univ Technol, Sch Phys Sci, Ctr Instrumental & Dev Chem, Brisbane, Qld 4001, Australia Queensland Univ Technol Brisbane Qld Australia 4001 , Qld 4001, Australia
Titolo Testata:
ANALYTICA CHIMICA ACTA
fascicolo: 1, volume: 431, anno: 2001,
pagine: 101 - 113
SICI:
0003-2670(20010308)431:1<101:SDONAN>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTIAL LEAST-SQUARES; ORTHOGONAL ARRAY DESIGN; PERFORMANCE LIQUID-CHROMATOGRAPHY; ADSORPTIVE STRIPPING VOLTAMMETRY; MICROWAVE DISSOLUTION; BIOLOGICAL SAMPLES; MULTIVARIATE CALIBRATION; POLAROGRAPHIC-BEHAVIOR; METHYL-DERIVATIVES; TRACE ANALYSIS;
Keywords:
nitrobenzene; 2-nitrophenol; 3-nitrophenol; 4-nitrophenol; 2,4-dinitrophenol; chemometrics; differential pulse voltammetry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Ni, Y Nanchang Univ, Dept Chem, Jiangxi 330047, Nanchang, Peoples R China Nanchang Univ Jiangxi Nanchang Peoples R China 330047 oples R China
Citazione:
Y. Ni et al., "Simultaneous determination of nitrobenzene and nitro-substituted phenols by differential pulse voltammetry and chemometrics", ANALYT CHIM, 431(1), 2001, pp. 101-113

Abstract

The voltammetric behaviour of five nitro-substituted aromatic compounds, such as nitrobenzene, 2-, 3-, 4-nitrophenol and 2,4-dinitrophenol, was investigated, and a method was developed for the simultaneous determination of these compounds, based on their reduction at a hanging mercury drop electrode (HMDE). It was found that by applying the differential pulse voltammetric(DPV) approach in a Britton-Robinson buffer of pH 5.4, nitrobenzene, 2-, 3- and 4-nitrophenol had well defined voltammetric reduction waves with peakpotentials at -344, -284, -292 and -376 mV, respectively. However, 2,4-dinitrophenol had two peaks with potentials at -240 and -364 mV under the sameconditions. For each compound linear calibration graphs were obtained in the general concentration range of 0.05-3.0 mg l(-1). In mixtures of the five compounds, serious overlapping of voltammetric peaks was observed, and with conventional analytical methodology pre-separation steps would be required. In this study, chemometrics methods of data analysis, such as partial least squares (PLS), principal component regression (PCR) and classical least squares (CLS), were applied to resolve the overlapped voltammograms. Orthogonal experimental design was used for construction of the training sets containing the five aromatic compounds in the concentration range of 0.1-2.6mg l(-1). Five significant factors or principal components were modelled for prediction by the PLS and PCR methods, respectively. The percent of relative prediction error (RPE) was similar and acceptable for both methods being approximately +/-10%. The percent of recoveries were within +/-10% of the target value. The CLS method performed poorly (RPET = 38%). The developedmethod was then applied to the analysis of these nitro-substituted aromatic compounds in field samples with similar satisfactory results. (C) 2001 Elsevier Science B.V. All rights reserved

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Documento generato il 05/04/20 alle ore 06:14:49