Application of internal standard for derivative-spectrophotometric determination of azinphos-methyl in commercial formulations

Wróbel-Zasada, K.; Wróbel-Kaczmarczyk, Katarzyna; López-de-Alba, Pedro Luı́s; López-Martínez, Leticia; García-López, Marco Antonio

doi:10.1016/0039-9140(96)01859-0

Cited by 15 publications

(1 citation statement)

References 12 publications

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“…This technique has been satisfactorily applied to the resolution of mainly binary mixtures of pharmaceuticals, metal ions and food additives in chemical disciplines which are as wide ranging as clinical chemistry or food chemistry, to quote just two (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). This technique has been satisfactorily applied to the resolution of mainly binary mixtures of pharmaceuticals, metal ions and food additives in chemical disciplines which are as wide ranging as clinical chemistry or food chemistry, to quote just two (1)(2)(3)(4)(5)(6)(7)(8)(9)(10).…”

Section: Introductionmentioning

confidence: 99%

Bivariate Calibration as an Alternative for Zero-Crossing Technique in the Resolution of Binary Mixtures by Derivative Spectrophotometry

2001

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In this work, the bivariate calibration algorithm is proposed as an alternative for the resolution of binary mixtures using derivative spectrophotometry. This algorithm involves the use of four calibration curves: two for each compound at two different wavelengths, selected by Kaiser's method. Four binary mixtures were studied (tartrazine-allura red; sunset yellow-erythrosine B; tartrazine-riboflavine and acetylsalycilic acid-caffeine) as representative examples where their 2563 ORDER REPRINTS resolution with the conventional zero-crossing technique is not suitable and, in each case, rather good analytical results were obtained using the bivariate method.

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Section: Introductionmentioning

confidence: 99%

Bivariate Calibration as an Alternative for Zero-Crossing Technique in the Resolution of Binary Mixtures by Derivative Spectrophotometry

2001

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Derivative Techniques in Molecular Absorption, Fluorimetry and Liquid Chromatography as Tools for Green Analytical Chemistry

Pavón

Torres

Ojeda

et al. 2012

Handbook of Green Analytical Chemistry

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Ensuring both normality and homocedasticity of chromatographic data-ratios for internal-standard least-squares calibration

et al. 1998

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Because the quotient of two normal variables does not fit a normal distribution and tends to be heterocedastic, the use of internal-standard least-squares regression on data obtained from such ratios gives a calibration function which can result in inaccurate determination of the concentration of analyte in a sample. In this work we have studied simulated situations in which area-ratios are fitted to a normal distribution. It is shown that the least-squares model is inappropriate when the ordinate data-ratios are not normally distributed, and some recommendations are proposed to ensure both normality and homocedasticity of the quotient of analyte/ internal-standard signals. Finally, GC-MS separation and quantification of nine fatty acids by use of an internal standard are used for experimental verification of the conclusions reached. 550

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Application of internal standard for derivative-spectrophotometric determination of azinphos-methyl in commercial formulations

Cited by 15 publications

References 12 publications

Bivariate Calibration as an Alternative for Zero-Crossing Technique in the Resolution of Binary Mixtures by Derivative Spectrophotometry

Bivariate Calibration as an Alternative for Zero-Crossing Technique in the Resolution of Binary Mixtures by Derivative Spectrophotometry

Derivative Techniques in Molecular Absorption, Fluorimetry and Liquid Chromatography as Tools for Green Analytical Chemistry

Ensuring both normality and homocedasticity of chromatographic data-ratios for internal-standard least-squares calibration

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