Spectrophotometric determination of uranium in natural waters after preconcentration on TBP-plasticized dibenzoylmethane-loaded polyurethane foams

Aziz, Md. Abdul; Beheir, Sh. G.; Shakir, K.

doi:10.1007/bf02041852

Cited by 21 publications

(7 citation statements)

References 17 publications

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“…Extraction of uranium from surface or ground water has recently become of interest [1,2,3,4]. It is known to be leached out of rock and to be present in water so its concentration varies in the range of 0.1-10 µg L -1 [5].…”

Section: Introductionmentioning

confidence: 99%

Solid-phase extraction–spectrophotometric determination of uranium(VI) in natural waters

2003

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A method for the extraction and determination of uranyl ion in natural waters using octadecyl bonded silica membrane disks modified with piroxicam and spectrophotometry with arsenazo(III) is proposed. The perconcentration step was studied with regard to experimental parameters such as amount of extractant, type and amount of eluent, pH, flow rates and tolerance limit of diverse ions on the recovery of uranyl ion. The limit of detection of the proposed method is 0.4 micro g L(-1) of uranyl. The method was applied to the recovery of uranyl from different water samples.

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Section: Introductionmentioning

confidence: 99%

Solid-phase extraction–spectrophotometric determination of uranium(VI) in natural waters

2003

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“…The organic reagent loaded PUF is more selective for the metal ions that have coordination number greater than double the charge of the metal ions. The preconcentration of uranium from aqueous solution on PUF impregnating with dibenzoylmethane [11] and trioctylphosphine oxide [12] were reported in the literature.…”

Section: Introductionmentioning

confidence: 98%

Adsorption modeling and thermodynamic characteristics of uranium(VI) ions onto 1-(2-pyridylazo)-2-naphthol (PAN) supported polyurethane foam

Saeed¹,

Ahmad²

2005

Radiochimica Acta

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The sorption of uranium(VI) ions onto PAN loaded PUF has been investigated. Quantitative sorption of uranium(VI) onto PAN loaded PUF was achieved after 30 minutes equilibration time from pH 7 buffer solution. The sorption data followed Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms. Langmuir parameters Q = 45.3 ± 0.2 µmol g −1 and b = (76.2 ± 0.2) × 10 3 dm 3 mol −1 , Freundlich constants 1/n = 0.21 ± 0.01 and K F = 229 ± 21 µmol g −1 and D-R parameters β= − 0.0015 ± 0.00005 kJ 2 mol −2 , X m = 72.23 ± 3.11 µmol g −1 and E = 18.3 ± 0.3 kJ mol −1 have been evaluated. The variation of sorption data with temperature gives ∆H = 176 ± 5 kJ mol −1 , ∆S = 626 ± 17 J mol −1 K −1 and ∆G = −10.6 ± 0.7 kJ mol −1 at 298 K. The positive value of enthalpy (∆H) and negative value of free energy (∆G) show endothermic and spontaneous nature of sorption respectively. A number of solvents were tested to elute the uranium-PAN complex from the PAN loaded PUF, only amine solvents and cyclohexanone have the capability to desorb the complex. The sorption mechanism has been discussed.

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“…4,5 The uranium concentration of seawater is usually about 3 mg L À1 . 6 The guideline values established for the maximum permissible concentration levels of uranium in drinking water is in the range of 15-30 mg L À1 . 2,7 Thus, highly sensitive methods are required for the determination of uranium in water samples.…”

Section: Introductionmentioning

confidence: 99%

Dispersive liquid–liquid micro extraction of uranium(vi) from groundwater and seawater samples and determination by inductively coupled plasma–optical emission spectrometry and flow injection–inductively coupled plasma mass spectrometry

2011

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Spectrophotometric determination of uranium in natural waters after preconcentration on TBP-plasticized dibenzoylmethane-loaded polyurethane foams

Cited by 21 publications

References 17 publications

Solid-phase extraction–spectrophotometric determination of uranium(VI) in natural waters

Solid-phase extraction–spectrophotometric determination of uranium(VI) in natural waters

Adsorption modeling and thermodynamic characteristics of uranium(VI) ions onto 1-(2-pyridylazo)-2-naphthol (PAN) supported polyurethane foam

Dispersive liquid–liquid micro extraction of uranium(vi) from groundwater and seawater samples and determination by inductively coupled plasma–optical emission spectrometry and flow injection–inductively coupled plasma mass spectrometry

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