scholarly journals Extraction and separation studies of Ga(III), In(III) and Tl(III) using the neutral organophosphorous extractant, Cyanex-923

2003 ◽  
Vol 68 (7) ◽  
pp. 581-591 ◽  
Author(s):  
S.D. Pawar ◽  
P.M. Dhadke
Keyword(s):  
Metal Ions ◽  
Organic Phase ◽  
Acidic Solution ◽  
Sequential Procedure ◽  
Analysis Method ◽  
Effect Of Ph ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923 ◽  
Ph Range

The neutral extractant, Cyanes-923 has been used for the extraction and separation of gallium(III), indium(III) and thallium(III) from acidic solution. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the pH range 4.5?5.5, 5.0?6.5 and 1.5?3.0 respectively, and from the organic phase they can be stripped with 2.0 mol dm-3 HNO3, 3.0 mol dm-3 HNO3 and 3.0 mol dm-3 HCl, respectively. The effect of pH equilibration period, diluents, diverse ions and stripping agents on the extraction of Ga(III), In(III) and Tl(III) has been studied. The stroichiometry of the extracted species of these metal ions was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were [MCl3. 3Cyanex-923]?[where M = Ga(III) or In(III)]?and [HTlCl4. 3Cyanex-923]. Based on these results a sequential procedure for the separation of Ga(III), In(III) and Tl(III) from each other was developed.

scholarly journals Extraction and separation of U(VI) and Th(IV) from hydrobromic acid media using Cyanex-923 extractant

2010 ◽  
Vol 75 (11) ◽  
pp. 1549-1557 ◽  
Author(s):  
Snehal Ghag ◽  
Suresh Pawar
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Organic Phase ◽  
Phosphine Oxide ◽  
Hydrobromic Acid ◽  
Analysis Method ◽  
Acid Media ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923

A systematic study of the solvent extraction of uranium(VI) and thorium(IV) from hydrobromic acid media was performed using the neutral phosphine oxide extractant Cyanex-923 in toluene. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the acidity range 5x10-5-1x10-4 M and 5x10-5-5x10-3 M, respectively, and they are stripped from the organic phase with 7.0 M HClO4 and 2.0- 4.0 M HCl, respectively. The effect of the equilibrium period, diluents, diverse ions and stripping agent on the extraction of U(VI) and Th(IV) was studied. The stoichiometry of the extracted species of these metal ions was determined based on the slope analysis method. The extraction reactions proceed by solvation and their probable extracted species found in the organic phase were UO2Br2?2Cyanex-923 and ThBr4?2Cyanex-923. Based on these results, a sequential procedure for their separation from each other was developed.

scholarly journals Extraction and Separation Study of Mo(VI) and W(VI) Using Organophosphorous Extractant

2015 ◽  
Vol 48 ◽  
pp. 87-94
Author(s):  
D.V. Chavan ◽  
S.D. Pawar
Keyword(s):  
Metal Ions ◽  
Ph Effect ◽  
Reagent Concentration ◽  
Analysis Method ◽  
Effect Of Ph ◽  
Sequential Methods ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923

Organophosphorous extractant, Cyanex-923, has been used for the extraction and separation of Mo(VI) and W(VI) is described. The extraction of the metal ions is studied as the function of several parameters such as effect of pH, effect of reagent concentration, stripping agents, diluents study and effect of diverse ion. It was observed that Cyanex-923 extracts Mo(VI) at pH 2.5-4.5 while W(VI) was extracted at pH 0.5-1.5. The extracted Mo(VI) was stripped back using 0.1M NaOH, while W(VI) was stripped back using 1.0 M (NH4)2CO3. The stoichiometry of the extracted species of Mo(VI) and W(VI) was determined on the basis of slope analysis method. Based on the results sequential methods of separation of both the metals were developed.

Extraction Studies of Lanthanum(III) from Sodium Salicylate Medium Using Trialkyl Phosphine Oxide

2015 ◽  
Vol 54 ◽  
pp. 143-149
Author(s):  
S.D. Pawar
Keyword(s):  
Metal Ion ◽  
Sodium Salicylate ◽  
Analysis Method ◽  
Extraction And Separation ◽  
Salicylate Concentration ◽  
Slope Analysis ◽  
Cyanex 923 ◽  
Loaded Organic Phase ◽  
Trialkylphosphine Oxide ◽  
Hcl Solution

Cyanex-923, a mixture of four trialkylphosphine oxide has been used for the extraction and separation of La(III) from sodium salicylate medium. Lanthanum(III) ion was found to be quantitatively extracted with Cyanex-923 in toluene at pH 6.0. The metal loaded organic phase is stripped with 2.0M HCl solution. Various parameters like effect of pH, Cyanex-923 concentration, sodium salicylate concentration, diluents, equilibration period and stripping agent on the extraction of La(III) has been studied. The stoichiometry of the extracted species of this metal ion was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were LaSal-HSal .2Cyanex-923.

EXTRACTION AND SEPARATION OF SOME 3d TRANSITION METAL IONS USING CYANEX 923

2002 ◽  
Vol 20 (1) ◽  
pp. 81-96 ◽  
Author(s):  
Bina Gupta ◽  
Akash Deep ◽  
Poonma Malik ◽  
S. N. Tandon
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Extraction And Separation ◽  
Cyanex 923

scholarly journals Molten solvent extraction behavior of palladium with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone at 60 °C

2007 ◽  
Vol 5 (3) ◽  
pp. 912-921 ◽  
Author(s):  
Bo Peng ◽  
Xiaojun Guo ◽  
Xuefen Mao ◽  
Jinzhang Gao
Keyword(s):  
Solvent Extraction ◽  
Precious Metal ◽  
Extraction Efficiency ◽  
Equilibrium Temperature ◽  
Paraffin Wax ◽  
Analysis Method ◽  
Extractant Concentration ◽  
Slope Analysis ◽  
Extraction Behavior ◽  
Ph Range

AbstractThe solvent extraction behavior of precious metal palladium with 1-phenyl-3-methyl-4-benzoyl-5-pyrazone (PMBP) into molten paraffin wax has been studied in the temperature range from 55 to 75 °C. The complex consisting of PMBP and palladium was extracted into molten wax phase in the pH range from 1.0 to 3.5 at 60 °C. The extraction efficiency was up to 97% at the experimental pH. The stoichiometry of the extracted species of palladium was determined on the basis of slope analysis method. The effects of time to achieve equilibrium, temperature, and extractant concentration on the extraction were discussed. The thermodynamic data indicate that the extraction is an endothermic reaction and the increase of temperature promotes the extraction of palladium into molten paraffin wax and the extraction of palladium with PMBP is entropy controlled at high temperatures.

scholarly journals Extraction and separation studies of zinc(II) and copper(II) with D2EHPA and PC-88A from perchlorate media

2002 ◽  
Vol 67 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Rajeev Singh ◽  
Purshottam Dhadke
Keyword(s):  
Phosphoric Acid ◽  
Organic Phase ◽  
Real Samples ◽  
Extraction And Separation ◽  
Ph Range

The extraction behaviors of Zn(II) and Cu(II) from perchlorate media have been investigated using bis-2-ethylhexyl phosphoric acid (D2EHPA) and 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester, (PC-88A) in toluene. The extraction of Zn(II) was found to be quantitative in the pH range 2.5 to 3.0 and 3.0 to 4.0 using 1.0 x 10-1 moldm-3 D2EHPAand 1.0x10-2 mol dm-3 PC-88Ain toluene, respectively, while Cu(II) was extracted quantitatively in the pH range 6.0 to 8.0 and 5.5 to 7.0 with 1.0x10-2 mol dm-3 and 1.0 x 10-3 mol dm-3 D2EHPA and PC-88A in toluene, respectively. Zn(II) was stripped with 4.0 moldm-3 HCl, while Cu(II) with 2.0 moldm-3H2SO4 and 3.0 moldm-3 HNO3 from the organic phase containing D2EHPAand PC-88A respectively. The probable extracted species were ascertained by log D vs. log [HR] plot to be ZnR2.2HR and CuR2.2HR for both the reagents. These methods were used for the determination of Zn(II) and Cu(II) in real samples. The separation of Zn(II) and Cu(II) were carried out from each other and with associated metals.

scholarly journals A Rapid and Direct Sensitive Spectrophotometric Method for the Determination of Molybdenum(VI) using Gallacetophenone Phenylhydrazone with Application to Alloy Steel Samples

2011 ◽  
Vol 8 (3) ◽  
pp. 1362-1370 ◽  
Author(s):  
D. Venkataramana Reddy ◽  
P. V. Chalapathi ◽  
A. Varada Reddy
Keyword(s):  
Alloy Steel ◽  
Spectrophotometric Method ◽  
Room Temperature ◽  
Molar Absorptivity ◽  
Analysis Method ◽  
Slope Analysis ◽  
Relative Standard ◽  
Analytical Reagent ◽  
Ph Range

A rapid, sensitive and fairly selective spectrophotometric method has been developed for the determination of molybdenum(VI) using gallacetophenone phenylhydrazone (GPPH) as an analytical reagent. The GPPH forms an orange red species of molybdenum(VI) at a pH range of 3.0-4.0 and the complex is soluble in 20% ethanol. The Mo(VI)-GPPH complex shows maximum absorbance at 375 nm with molar absorptivity and Sandellʼs sensitivity being 1.539x104L/mol cm and 1.5x10-3μg cm-2respectively. The system obeys Beerʼs law in the range of 1.0-6.0 μg/mL. The repeatability of the method was checked by finding the relative standard deviation. The composition of the Mo(VI)-GPPH complex is established as 1:2 by slope analysis method. The instability constant of the complex calculated from Edmond and Birnbaumʼs method is 6.785x10-8at room temperature. The interfering effect of various cations and anions has also been studied. The method has been applied for the determination of Mo(VI) in alloy steel samples.

Extraction of Eu(III) and Tm(III) with picrolonic acid in methylisobutylketone

2004 ◽  
Vol 92 (2) ◽  
Author(s):  
Akbar Ali
Keyword(s):  
Metal Ions ◽  
Analysis Method ◽  
Buffer Solution ◽  
Slope Analysis ◽  
Picrolonic Acid

SummaryPicrolonic acid (HPA) in methylisobutylketone (MIBK) has been used for the extraction studies of Eu(III) and Tm(III) from pH 2 buffer solution. The composition of the organic adduct responsible for the extraction of these metal ions has been determined by slope analysis method that came out to be M(PA)

scholarly journals DISTRIBUTION OF IRON (II) BETWEEN BUFFERED AQUEOUS SOLUTIONS AND CHLOROFORM SOLUTION OF N,N’-ETHYLENEBIS(4-BUTANOYL-2,4-DIHYDRO-5-METHYL-2-PHENYL-3H-PYRAZOL-3-ONEIMINE)

2012 ◽  
Vol 8 (2) ◽  
pp. 1581-1589 ◽  
Author(s):  
J. Godwin ◽  
U. J. Chukwu ◽  
T. D. Gad
Keyword(s):  
Aqueous Solution ◽  
Organic Phase ◽  
Chloroform Solution ◽  
Slope Analysis ◽  
Mixed Ligands ◽  
Quantitative Extraction ◽  
Before And After ◽  
Extraction Parameters ◽  
Ph Range ◽  
Optimal Ph

The distribution of Fe(II) between buffered aqueous solution and chloroform solution of N,N’-Ethylenebis(4-butanoyl-2-4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneimine)(H2BuEtP) was investigated. The effect of 4-butanoyl-2-4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one(HBuP) in the distribution was also studied. Fe(II) concentration in aqueous raffinate was determined colorimetrically and distribution ratios and percentage extractions calculated by difference from Fe(II) in aqueous phase before and after equilibrations. The optimal pH for Fe(II) distribution slightly lowered to 8.00 in mixed ligands(H2BuEtP/HBuP) organic phase from 8.25 in ligand (H2BuEtP) alone organic phase. The pH range at which quantitative extraction of Fe(II) from aqueous buffered solution into both type of organic phases used for the study was very narrow. The extraction parameters; pH1/2, log D from extraction plots, and log Kex calculated using extraction equations derived from slope analysis showed that the values in both type of organic phases were very close even though mixed ligands(H2BuEtP/HBuP) organic phase values were slightly higher and better. Slope analysis also indicated that the Fe(II) complexes extracted into both organic phases were Fe(BuEtP)o and Fe(HBuEtP)(BuP)o respectively.

Solvent extraction of uranium(VI) and thorium(IV) from nitrate media by Cyanex 923

2000 ◽  
Vol 88 (1) ◽  
Author(s):  
S.K. Sahu ◽  
M.L.P. Reddy ◽  
T.R. Ramamohan ◽  
V. Chakravortty
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Metal Ion ◽  
Theoretical Methods ◽  
Extraction Behaviour ◽  
Cyanex 923 ◽  
Inorganic Ligands ◽  
Nitrate Solutions

The extraction behaviour of uranium(VI) and thorium(IV) from nitrate solutions has been investigated using Cyanex 923 (TRPO) in xylene as an extractant. The extraction data have been analyzed by both graphical and theoretical methods by taking into account complexation of the metal ion in the aqueous phase with inorganic ligands and all plausible complexes extracted into the organic phase. The results demonstrate that these metal ions are extracted into xylene as Th(NO

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