Spectrophotometric determination of osmium with 1-phenyl-4,4,6-trimethyl-(1H,4H)-2-pyrimidinethiol and extraction into molten naphthalene

Wasey, A. H. M. Abdul; Bansal, R. K.; Puri, B. K.; Rao, A. L. J.

doi:10.1016/0039-9140(84)80051-x

Cited by 38 publications

(14 citation statements)

References 2 publications

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“…Owing to its simple procedure, rapid phase separation, high extraction capacity and easy combination with various highly sensitive detectors, solid-liquid extraction with microcrystalline naphthalene has great prospects in the trace analyses. [1][2][3][4][5] Quinones are compounds of wide occurrence in nature. Their importance in biochemistry is seen as bacteriostatic materials 6 in antifungicidal action 7 in the inhibitory influence on certain enzymes like carboxylase and urease 6 and in the antitumor activity, which makes some quinones useful in cancer chemotherapy.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Spectrophotometric Determination of p-Benzoquinone and Chloranil after Microcrystalline Naphthalene Extraction by Using Genetic Algorithm-Based Wavelength Selection-Partial Least Squares Regression

Abdollahi

Bagheri

2004

ANAL. SCI.

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Microcrystalline naphthalene extraction has been used for the preconcentration of p-benzoquinone and tetrachloro-pbenzoquinone (chloranil), after their reaction by aniline, and later simultaneous spectrophotometric analysis by genetic algorithm-partial least squares (GA-PLS) calibration. The chemical variables affecting the analytical performance of the methodology were studied and optimized. Under the optimum conditions i.e., [aniline] = 0.05 M and [naphthalene] = 2.2% (w/v), preconcentration of 25 ml of sample solution permitted the detection of 0.32 and 0.23 µg ml -1 for pbenzoquinone and chloranil, respectively. The predictive abilities of partial least squares regression (PLS) and genetic algorithm-partial least squares regression (GA-PLS) were examined for simultaneous determination of two quinones. The GA-PLS shows superiority over other PLS methods due to the wavelength selection in PLS calibration using a genetic algorithm without loss of prediction capacity, provides useful information about the chemical system.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Spectrophotometric Determination of p-Benzoquinone and Chloranil after Microcrystalline Naphthalene Extraction by Using Genetic Algorithm-Based Wavelength Selection-Partial Least Squares Regression

Abdollahi

Bagheri

2004

ANAL. SCI.

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“…Solvent extraction is a simple and convenient technique for separating and concentrating metal ions, but it cannot be applied directly to metal ions, which form stable complexes with the chelating agents only at elevated temperature. This difficulty can be overcome by using naphthalene as the extractant [35] for thermally stable metal chelates [36]. Solid-liquid separation after adsorption of metal chelates on microcrystalline naphthalene is more rapid and convenient and can be applied to many types of metal complexes [25,26].…”

Section: Introductionmentioning

confidence: 99%

<b>Derivative spectrophotometric determination of trace lead in alloys and biological samples after separation and preconcentration with the ion pair of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and ammonium tetraphenylborate on microcrystalline </b>

Taher

2004

Bull. Chem. Soc. Eth.

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ABSTRACT. Lead is quantitatively retained on 2-(5-bromo-2-pyridylazo)-5-diethylaminophenolammonium tetraphenylborate with microcrystalline naphthalene or by a column method in the pH range 4.0-6.0 from a large volume of aqueous solutions of various samples. After filtration, the solid mass consisting of the lead complex and naphthalene was dissolved with 5 mL of dimethylformamide and the metal was determined by third derivative spectrophotometry. Lead complex can alternatively be quantitatively adsorbed on ammonium tetraphenylboratenaphthalene adsorbent packed in a column and determined similarly. About 0.2 µg of lead can be concentrated in a column from 300 mL of aqueous sample, where its concentration is as low as 0.7 ng/mL. The interference of a large number of anions and cations has been studied and the optimized conditions developed have been utilized for the trace determination of lead in various samples.

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“…This difficulty may be overcome by using molten naphthalene as the extractant for thermally stable metal chelates. 11,12 Solid-liquid separation after the adsorption of metal chelates on microcrystalline naphthalene is a more rapid and convenient method, and can be applied to many types of metal complexes. 13 Uranium(VI) is adsorbed as a uranium trifluoroethylxanthate (TFEX)-cetyltrimethylammonium (CTMA) ion-pair complex on microcrystalline naphthalene quantitatively in the pH range 4.2 -7.0.…”

Section: Introductionmentioning

confidence: 99%

Differential Pulse Polarographic Determination of Uranium(VI) in Complex Materials after Adsorption of Its Trifluoroethylxanthate Cetyltrimethylammonium Ion-Associated Complex on Naphthalene Adsorbent

et al. 2002

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Spectrophotometric determination of osmium with 1-phenyl-4,4,6-trimethyl-(1H,4H)-2-pyrimidinethiol and extraction into molten naphthalene

Cited by 38 publications

References 2 publications

Simultaneous Spectrophotometric Determination of p-Benzoquinone and Chloranil after Microcrystalline Naphthalene Extraction by Using Genetic Algorithm-Based Wavelength Selection-Partial Least Squares Regression

Simultaneous Spectrophotometric Determination of p-Benzoquinone and Chloranil after Microcrystalline Naphthalene Extraction by Using Genetic Algorithm-Based Wavelength Selection-Partial Least Squares Regression

<b>Derivative spectrophotometric determination of trace lead in alloys and biological samples after separation and preconcentration with the ion pair of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and ammonium tetraphenylborate on microcrystalline </b>

Differential Pulse Polarographic Determination of Uranium(VI) in Complex Materials after Adsorption of Its Trifluoroethylxanthate Cetyltrimethylammonium Ion-Associated Complex on Naphthalene Adsorbent

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