Spectrophotometric determination of vanadium(iv) with phenylfluorone

Verma, Jyoti; Prakash, Om; Mushran, S. P.

doi:10.1016/s0003-2670(01)80967-3

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…The molar absorpitivity value of the complex V(IV)-HMBPT (0.12 × 10 5 L mol -1 cm -1 ) reveals that the reagent HMBPT compares well, or is more sensitive, for V(IV) than reagents reported previously for the spectrophotometric determination of V(IV) such as, chrome azurole, 32,33 Eriochrome Cyanine R, 32,34,35 Catechol Violet, 36 and trihdyroxy fluorine dyes. 37,38 One of the most important advantages of the recommended method is the ability to analyze a larger volume of sample solution, and to obtain a great preconcentration factor, as well as excellent recoveries of the investigated trace element. The effective flotation using only HOL indicates that the addition of HMBPT makes the sublate sufficiently hydrophobic, and does not need more surfactants.…”

Section: Resultsmentioning

confidence: 99%

Separation via Flotation, Spectrophotometric Speciation, and Determination of Vanadium(IV) in Wastes of Power Stations

2005

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1-(2-Hydroxy-4-methoxybenzophenone)-4-phenylthiosemicarbazone (HMBPT) was investigated as a new reagent for the flotation of vanadium(IV). At pH ∼1.5, vanadium(IV) forms a 1:1 pale-violet complex with HMBPT in aqueous solution. An intense clear violet layer was formed after flotation, by adding an oleic acid (HOL) surfactant. The composition of the float was 1:1 [V(IV)]: [HMBPT]. A highly selective and sensitive spectrophotometric procedure was proposed for the determination of microamounts of V(IV) as its floated complex. The molar absorptivities of the V(IV)-HMBPT and V(IV)-HMBPT-HOL systems were 0.4 × 10 4 and 0.12 × 10 5 L mol -1 cm -1 at 560 nm, respectively. The formation constants of the species formed in the presence and absence of HOL were 4.6 × 10 7 and 8.7 × 10 5 L mol -1 , respectively. Beer's law was obeyed up to 1 × 10 -4 mol L -1 in the aqueous layer as well as in the oleic acid layer. The HMBPT-V(IV) complexes formed in the aqueous solution and scum layer were characterized by elemental analysis, infrared and UV spectrophotometric studies. The mode of chelation between V(IV) and HMBPT is proposed to be due to a reaction between the protonated bidentate HMBPT ligand and V(IV) through the S=C and N=C groups. Interferences from various foreign ions were avoided by adding excess HMBPT and/or Na2S2O3 as a masking agent. The proposed flotation 1 method was successfully applied to the analysis of V(IV) in synthetic mixtures, wastes of power stations, simulated samples and in real ores. The separation mechanism is discussed.

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Section: Resultsmentioning

confidence: 99%

Separation via Flotation, Spectrophotometric Speciation, and Determination of Vanadium(IV) in Wastes of Power Stations

2005

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Determination of vanadium in steels using phenylfluorone and cetylpyridinium bromide

Tarek

Zaki

Abuo-Zeid

1991

J of Chemical Tech & Biotech

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Vanadium(V) was determined spectrophotometrically by reaction with phenylfluorone (I) at pH 8.8 in the presence of cetylpyridinium bromide to form a 1:2 vanadium‐I chelate. The molar absorptivity of the sensitised chelate was 7.0 × 104 dm3 mol−1 cm−1 at 550 nm and the sensitivity index was 0.7 ng cm−2. Beer's law was followed up to 0.37 ppm of vanadium. The interference of other metal ions was eliminated by electrolytic separation using a mercury cathode. The developed method was successfully applied for the determination of vanadium in steels.

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Spectrophotometric determination of iron as phenylfluorone complex sensitized with Triton X-100

1989

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Spectrophotometric determination of vanadium(iv) with phenylfluorone

Cited by 10 publications

References 12 publications

Separation via Flotation, Spectrophotometric Speciation, and Determination of Vanadium(IV) in Wastes of Power Stations

Separation via Flotation, Spectrophotometric Speciation, and Determination of Vanadium(IV) in Wastes of Power Stations

Determination of vanadium in steels using phenylfluorone and cetylpyridinium bromide

Spectrophotometric determination of iron as phenylfluorone complex sensitized with Triton X-100

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