Recent developments in derivative ultraviolet/visible absorption spectrophotometery

Ojeda, C. Bosch

doi:10.1016/0039-9140(95)01589-4

Cited by 82 publications

(18 citation statements)

References 133 publications

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“…Derivative spectrophotometry (DS) is an advanced, modern spectrophotometric technique. In DS, the spectra are obtained by plotting the values of the first or second derivative of the zero-order spectrum as a function of wavelength (ALMEIDA et al, 2009;KARPINSKA;SZOSTAK, 2005;OJEDA;ROJAS, 2004).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of textile dyes by Adsorptive Cathodic Stripping Voltammetry

et al. 2013

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ABSTRACT. The Adsorptive Cathodic Stripping Voltammetry (ACSV -differential pulse) proved to be an efficient method in the separation and quantification of two reactive textile dyes, Procion Yellow (PY) and Procion Red (PR), each containing two azo groups as chromophores and two monochlorotriazine reactive groups, at nanomolar level. for PR in B-R buffer pH 8.0, using preconcentration at -0.1 V during 60 s.Keywords: stripping voltammetry, reactive dyes, textile dyes. Determinação simultânea de corantes têxteis por Voltametria Adsortiva de Redissolução CatódicaRESUMO. A técnica de voltametria adsortiva de redissolução catódica (VARC -pulso diferencial) mostrou-se eficiente na separação e quantificação de dois corantes têxteis reativos, Amarelo Procion (PY) e Vermelho Procion (PR), cada um contendo dois grupos azo como cromóforos e dois grupos reativos monocloro-triazina, a nível nanomolar. A linearidade do método obtida para cada corante reativo foi 30,15 -633,15 nmol L -1 para AP em tampão B-R pH 8,0 e 62,56 -982,291 nmol L -1 para VP em tampão B-R pH 8,0, usando pré-concentração em -0,100 V por 60 s.

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Section: Introductionmentioning

confidence: 99%

Simultaneous determination of textile dyes by Adsorptive Cathodic Stripping Voltammetry

et al. 2013

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“…In a review published some years ago 18 Bosch et al cover all the methods that were currently available to researchers for utilizing a derivative spectrophotometer (DS) and their analytical applications until 1993. In recent years, the use of DS has become more practical owing to the increase in the resolving power of the analytical instrumentation and the easier access to microcomputers with appropriate software, which allows the almost instantaneous generation of the derivative spectra.…”

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Recent Developments of Derivative Spectrophotometry and Their Analytical Applications

El‐Sayed

El-Salem

2005

ANAL. SCI.

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The zero-crossing derivative spectra method is the most common procedure for the simultaneous determination of binary mixtures of their overlapping spectra. As an example, the derivative spectra of binary mixtures of phospho-and silicomolybdenum blue are illustrated in Fig. 1. 23 By measuring the derivative values (heights h1 in Fig. 1) for mixtures of phosphate and silicate at 806 nm (zero-crossing wavelength of silicomolybdate complex), one can avoid the interference by silicate and the phosphate concentration can be determined. By measuring the derivative values (heights h2 in Fig. 1 Moreover, one disadvantage of the zero-crossing method is the necessity of selecting critical wavelengths for the measurements. This selection causes considerable loss of sensitivity and precision in case of binary mixtures. The so-called "ratio spectra derivative" permits the use of the wavelengths corresponding to maximum or minimum and also the use of the distance between consecutive maximum and minimum, thus avoiding these problems. 24 Salinas et al. 25 developed a derivative quotient spectra method with a standard divisor when the spectra of the components are overlapped. The method was based on dividing the spectrum for a mixture into the standard spectra for each of the analyses and driving the quotient to obtain a spectrum that is independent of the analyte concentration used as a divisor. The use of standardized spectra as divisors minimizes experimental errors and background noise. 26 An accurate choice of standard divisors and working wavelengths is fundamental for several reasons. 25,27,28 Easy measurements on separate peaks, higher values of the analytical signals and no need to work only at zero-crossing points (sometimes co-existing compounds have no maximum or minimum at these wavelengths) are advantages for ratio spectra derivative spectrophotometry in comparison with the zerocrossing derivative spectrophotometry. Also, the presence of a lot of maxima and minima in ratio spectra derivative data was another advantage, since these wavelengths give an opportunity for the determination of these compounds in the presence of other active compounds and excipients that possibly interfered with the assay. 29 2·1 Resolution of binary and ternary mixtures by applyingderivative ratio spectra (derivative quotient spectra) The absorption spectrum of a mixture of three compounds; A, B and C is determined by this equation:AM,λ i = εA,λ i CA + εB,λ i CB + εC,λ i CC (path-length is 1 cm)where, AM,λ i is the absorbance value of the mixture at wavelength λi, εA,λ i , εB,λ i and εC,λ i are the molar absorptivities of A, B and C at λi, CA, CP and CC are the molar concentrations of A, B and C, respectively. When we divide this spectrum by the spectrum of a standard solution of one of the components (e.g., A of concentration CA). That is bywe obtainThe first derivative of this spectrum ratio givesIf CC = 0, we have the binary mixture of A and B, and the spectrum in this case is:In Eq. (5) we can see that the derivative ratio spectrum of...

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“…The high solubilizing capacity of micellar systems 20,21 and derivatization of spectral profiles not only offer a convenient solution to the resolution of absorption profiles of multicomponent systems, 22 but also enhance the spectral details and analytical value of the normal photometric analysis. 23,24 This paper describes a simple and selective derivative spectrophotometric method for the individual and simultaneous determination of trace amounts of gallium(III) and indium(III) using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol, a chromogenic reagent 25 and a cationic surfactant, cetylpyridinium chloride. 21 Various parameters for the determination of the above metal ions have been evaluated and conditions have been optimized for their simultaneous determination in synthetic binary mixtures, standard reference materials and environmental samples.…”

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Simultaneous Determination of Gallium and Indium with 2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol in Cationic Micellar Medium Using Derivative Spectrophotometry

et al. 2003

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Recent developments in derivative ultraviolet/visible absorption spectrophotometery

Cited by 82 publications

References 133 publications

Simultaneous determination of textile dyes by Adsorptive Cathodic Stripping Voltammetry

Simultaneous determination of textile dyes by Adsorptive Cathodic Stripping Voltammetry

Recent Developments of Derivative Spectrophotometry and Their Analytical Applications

Simultaneous Determination of Gallium and Indium with 2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol in Cationic Micellar Medium Using Derivative Spectrophotometry

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