Extraction and atomic absorption determination of molybdenum(VI) with 2-hydroxy-5-tert-butylphenol-2′-methylazobenzene

Pashadzhanov, A. M.

doi:10.1134/s1061934806080089

Cited by 2 publications

(2 citation statements)

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“…It is known that azo compounds based on para-tret-butylphenol are promising reagents in analytical chemistry for the determination of metal ions, this is due to the fact that the hydroxyl group of para-tret-butylphenol creates the possibility of complex formation with the direct participation of the nitrogen atom of the azo group with the appearance of metal-nitrogen bond [1][2][3][4]. Study of analytical properties of azo-tertbutylphenol derivatives showed that their use for spectrophotometric determination of metal ions increases not only sensitivity, in some cases, the selectivity of determination.…”

Section: Introductionmentioning

confidence: 99%

Extraction and Atomic-Absorption Determination of Tungsten (Vi) With 2-Hydroxy-5-T-Butylphenol-4'-Nitroazobenzene

Pashajanov¹,

Ismailov²,

Ismayilov³

et al. 2022

AChJ

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The complexation of tungsten (VI) with an azo compound synthesized from para-tret-butylphenol (2-hydroxy-5-Tr-butylphenol-4-nitro-asobenzene) has been studied spectrophoto¬metrically. The optimum pH values of the solution are 2.0-3.0. The maximum light absorption of the complexes in n-butanol is in the range 460-470nm, and that of the reagent at 360-370; complex formation is accompanied by a bathochromic shift. The spectrophotometric characteristics of the complex have been calculated and the composition of the complex was determined by various methods. Using the equilibrium shift and isomolar series methods it has been found that the W:R ratio is 1:2. By the Sommer method it has been found that during complex formation one proton is released from each reagent molecule. The complex stability constant βk = 9.04·108 and the complex formation reaction equilibrium constant (4.2·104) have been calculated by the method of Komar. The molar absorption coefficient is (3.44.2).104. The graduation diagram is linear at a tungsten concentration of 1.0-10 µg/ml, n-butanol has been used as an extractant. A single extraction with n-butanol 97% of tungsten as a complex is extracted. Methods of extraction-atomic-absorption and extraction-photometric determination of tungsten have been developed and the influence of a number of extraneous ions on the determination of tungsten has been revealed. The correctness of the results obtained has been controlled by analysing the State Standard Alloy Reference Materials

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Section: Introductionmentioning

confidence: 99%

Extraction and Atomic-Absorption Determination of Tungsten (Vi) With 2-Hydroxy-5-T-Butylphenol-4'-Nitroazobenzene

Pashajanov¹,

Ismailov²,

Ismayilov³

et al. 2022

AChJ

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“…In this aspect, azo compounds that contain nitrogen atoms are promising reagents for gallium ion in photometric and extraction-atomic absorption determination [1]- [7]. It is known that azo compounds based on para-tert-butylphenol and pyrogallol are promising reagents for the determination of several metal ions [8] [9]. This is because the hydroxyl group of Journal of Materials Science and Chemical Engineering para-tert-butylphenol provides the possibility of complex formation with the direct participation of the nitrogen atom of the azo group forming metal-nitrogen bond.…”

Section: Introductionmentioning

confidence: 99%

Extraction-Atomic-Absorption Determination of Gallium (III) with 2-hydroxy-5-T-butylphenol-4’-methoxy-azobenzene

Pashajanov¹,

Bayramov²,

Abbasova³

et al. 2020

MSCE

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The complexation of gallium with 2-hydroxy-5-T-butylphenol-4'-methoxyazobenzene (HR) has been studied by atomic absorption and spectrophotometric methods. The optimal conditions for the formation and extraction of the complex were found. The maximum light absorption of the complex in n-butanol is in the range of 450-470 nm. The molar absorption coefficient is (3.3-4.2)⋅10 4. The stability constant of the gallium coordination compound in n-butanol is β l = 4.2⋅10 10. The developed technique allows to determine the gallium content within n × 10 −1-n × 10 −4 %. The selective and sensitive technique for the extraction-atomic absorption determination of gallium in soils has been developed.

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Extraction and atomic absorption determination of molybdenum(VI) with 2-hydroxy-5-tert-butylphenol-2′-methylazobenzene

Cited by 2 publications

References 0 publications

Extraction and Atomic-Absorption Determination of Tungsten (Vi) With 2-Hydroxy-5-T-Butylphenol-4'-Nitroazobenzene

Extraction and Atomic-Absorption Determination of Tungsten (Vi) With 2-Hydroxy-5-T-Butylphenol-4'-Nitroazobenzene

Extraction-Atomic-Absorption Determination of Gallium (III) with 2-hydroxy-5-T-butylphenol-4’-methoxy-azobenzene

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