Synthetic Inorganic Ion Exchangers. XIV Thin-Layer Chromatography of Metal Ions on Thorium Phosphate: Quantitative Separation of Au (III) from Several Metal Ions

Abstract

The analytical potential of thorium phosphate as an ion exchanger has been explored by thin layer chromatographic (TLC) technique. Binder-free thin layers of thorium phos -phate have been explored for several important binary and ternary separations. A TLC method has been developed for quantitative separation of microgram-quantities of Au(III) from several metal ions in pure butanol system.     

Separation of Pd(II) and Tl (III) from Various Metal Ions on Hydrous Zirconium Oxide Column

Abstract

The utility of hydrous zirconium oxide for the separation of metal ions has been explored. The Kd-values from different concentrations of chloride ions(pH-2) have been determined. On the basis of the sorption data Pd (II) and Tl (III) have been quantitatively separated from a number of metal ions. The representative elution curves are given and the recovery of the metal ions is reported.     

Synthetic Inorganic Ion-Exchangers XV. Thin-Layer Chromatography of Metal Ions on Thorium Tungstate: Quantitative Separation of Hg(II) from Several Other Metal Ions

Abstract

The analytical application of Thorium tungstate as an ion exchanger has been explored by thin-layer chromatographic (TLC) technique. Binder-free thin layers of thorium tungstate have been employed for some important binary and ternary separations. Quantitative separation of Hg(II) from the mixture of several other metal ions has been achieved.     

Studies on Hydrated Stannic Oxide. Part VI. Thin-Layer Chromatography of Some Anions on Hydrated Stannic Oxide: Quantitative Separation of Cr(VI) from Some Ores and Alloys

Abstract

The analytical applications of hydrated stannic oxide as an ion-exchanger have been investigated by thin-layer chromatographic (TLC) technique. Binder-free thin-layers of hydrated stannic oxide are useful for some binary separations. Quantitative separation of Cr(VI) and Mo(VI) from some binary mixtures have been achieved. The method is applied to separate microgram-quantities of Cr(VI) quantitatively from several ores and alloys in ammonia buffer (pH 10) system.     

Electrochromatography of Metal Ions on Zirconium(IV) Phosphoantimonate Papers: Quantitative Separation of Platinum(IV) from Platinum Group and Other Metal Ions

Abstract

Zirconium (IV) phosphoantimonate impregnated papers have been used to study the electrochromatographic behaviour of 29 metal ions in buffers of weak organic acids with their corresponding ammonium salts as background electrolytes at fixed voltage and time intervals. As a result of these investigations, the variation in the average mobility of metal ions with the ionisation constants of the organic acids used in buffers and other parameters such as atomic numbers and charge on the metal ions has been studied. On the basis of the differential mobilites of the metal ions, which depends on the ion exchange properties of Zr(IV) phosphoantimonate and the nature of the complexes formed with the electrolytes, some binary, ternary and quarternary separation have been achieved. Besides microgram separations (25 μg-100 μg) of Pt(TV) from Pt group and other metal ions have also been achieved.     

Chromatographic Studies on Hydrous Oxides of Polyvalent Metals. II. Electrochromatographic Studies of Amino Acids on Hydrous Zirconium (IV) Oxide Papers: Separation of Acidic Amino Acids

Abstract

Electrochromatographic behaviour of some amino acids on hydrous zirconium (IV) oxide impregnated papers have been carried out. Five background electrolytes of different pH were used for these studies at fixed potential difference and time     

Thin-Layer Chromatography of Metal Ions Complexed with Anils (V). Detection,Separation and Determination

Abstract

p-Diethylaminoanil of phenylglyoxal a bidentate ligand was used for complexation with Hg(II), UO₂(II), Au(III), Pt(IV) Mg(II), Bi(III), Sb(III) and Be(II) ions. The chelates were characterized by their analysis, molar conductance and infrared spectra. T.L.C. detection, separation and determination of these complexes on starch bound silica gel layers was studied Long persisting dark coloure of the complexes rendered the spots self descernible and no locating agent was required. A maximum four complexes could be resolved and identified. Errors in determinations and maximum separation limits were also deduced.     

Quantitative Separation of Hg(11) From Several Metal Ions on Zr(IV) Antimonate Papers

Abstract

The chromatographic behaviour of 32 metal ions has been studied on paper Impregnated with Zirconium(IV) antimonate in aqueous HCI and mixed solvent system containing dimethyisul phoxide and dioxane. Several Important binary and ternary separations have been achieved. Quantitative separation of Hg(ll) from Ni²⁺, Pb²⁺, Pd²⁺, Ru³⁺, Rh³⁺, Bi³⁺, Co²⁺, Cd²⁺ and Gd³⁺ is described.     

Thin-Layer Chromatographic Separation of Some Allied Metal Ions and Their Determination by Ring Colorimetry

Abstract

Suitable methods have been worked out for the separation and determination of various groups of similar metal ions in mixtures, employing a combination of thin-layer chromatography and ring colorimetry. Solvent mixtures employed were: n-butanol + 12N HCl + dioxan (5:1:4); n-butanol + 6N HCl + dioxan (5:1:4); hexanol + dioxan + acetic acid + water (160:10:2:40); methanol + water (9:1 and 7:3). The following mixtures of cations were separated by TLC and the separated constituents were subsequently determined by ring colorimetry: Fe(III)- Co(II)- Cu(II)- Pb(II)- Ni(II); Pt(IV)- Co(II)- Cu(II)- Pd(II)- Ni(II); Ag(I)- Ni(II)- Co(II)- Fe(III); Cu(II)- Ni(II)- Bi(III); Cu(II)- Bi(III)- Hg(II).     

Modelling of the Sorption of Sr(II) on Hydrous Zirconium Oxide

The amphoteric acid-base behavior of hydrous zirconium oxide (HZO) was investigated by titrating HZO with 0.05M HNO₃ and NaOH at constant ionic strength. The sorption of strontium from 0.05M NaNO₃ solution was measured as a function of pH. Abrupt increase in sorption was observed at the equilibrium pH of 9. The experimental titration and strontium sorption data on HZO were evaluated using the constant capacitance model (CCM) and diffuse double layer model (DLM). Various model parameters of Surface Complexation Models (SCM) were estimated, numerically, by non-linear regression. Modeling the sorption and speciation of Sr²⁺ on HZO indicated that the hydrolysis of Sr²⁺ to lower charged SrOH⁺ is the pre-requisite for the abrupt sorption behavior at pH 9.     

Sorption of Some Metal Ions on Inorganic Electron and Ion Exchangers Based on Zirconium(IV)

Conditions of sorption of nonferrous metal ions on inorganic electron and ion exchangers based on zirconium(IV) were analyzed. The sorption capacity was evaluated as influenced by pH, concentration, and temperature of the contacting solutions and nature and chemical composition of the ion exchanger.     

Quantitative Separation of Pd(II) by TLC of Metal Ions on Cerium (IV) Antimonate

Abstract

A quantitative TLC separation of metal ions using cerium (IV) antimonate as the solid phase are described. Using an acetonitrile- HNO₃ solvent Pb²⁺ can be separated quantitatively (2–10 μg) from several other ions. A quantitative spectrophotometric assay using p-nitroso-dimethylaniline is proposed.     

Separation Studies of Metal Ions in Sodium Thioglycolate Medium by Thin Layer Partition Chromatography

Abstract

A thin layer partition chromatographic method has been developed for separation of Fe(III), Ni(II), Zn(II), Cu(II), Pb(II) and Mn(II) on thin layers of silica gel-G as an adsorbent. The R_f values were determined using 0.01–0.2 aqueous solution of sodium thioglycolate as a mobile phase. The dependence of R_f values on the migration time, pH and concentration of mobile phase has been studied. The optimum conditions for possible 3-component separation have been determined. Metal ions have been separated, detected, eluted and quantitatively determined by atomic absorption spectroscopy. The present method was applied to the separation and determination of zinc in forensic samples.     

Poly(ethylene glycol) as Impregnator for Silica Gel in Salting-Out Thin-Layer Chromatography of Some Co(III) Complexes

Silica gel impregnated with poly(ethylene glycol) of different molecular mass (400, 1000, 1540, 4000, and 5500) was investigated for salting-out thin-layer chromatography of 15 mixed aminocarboxylato Co(III) complexes using eight ammonium sulphate solutions as mobile phases. Regularities established earlier for non-impregnated adsorbents are also valid in this work. Poly(ethylene glycol) of high molecular mass increases the hydrophobicity of the adsorbent. Positive linear dependence of R_M values and of salting-out efficiency on average poly(ethylene glycol) molecular mass was usually observed. In contrast with non-impregnated silica gel, separation was achieved between complexes with the smallest hydrocarbon groups.     

Thin Layer Chromatography of Metal Ions Complexed with Anils (VII) Detection,Separation, and Determination

Abstract

Dark colored chelates of p-dimethylaminoanil of 3-benzoyl-methylglyoxal bidentate ligand with Sb(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), ZrO(II), Y(III), La(III), Pr(III), Nd(III) Sm(III), Gd(III) and Dy(III) have been chromatographed on starch bound silica gel thin layers. New correlations of I.R. with R_f (resolving solvent) have been used to ascertain the colored spots.

Among various mixtures resolved qualitatively a few typical ones have been alanysed quantitatively. Errors in determinations and maximum separation limits have also been deduced.     

Adsorption Studies of Radionuclides and Toxic Metal Ions on a Modified Mesoporous Lanthanum(III) Silicate

A new adsorbent, modified mesoporous lanthanum(III) silicate, has been prepared with various molar ratios of Si/La (10, 20, 40, 80) and cethyltrimethylammonium bromide (CTAB) as structure directing agent. XRD, nitrogen sorption, SEM, IR, thermogravimetry and sorption of radionuclides and toxic metal ions have been studied. The results show that adsorption amount of some element such as Pb(II) and Th(IV) has been increased significantly by incorporation of lanthanum ions in the framework of adsorbent. Separation of Co(II)‐Th(IV), Co(II)‐U(VI) and Mo(VI)‐U(VI) has been developed on columns of this adsorbent.     

Quantitative Separation of Iron from some Multivitamin-Multimineral Formulations using Zirconium (Iv) Arsenophosphate Columns

Abstract

Iron has been separated quantitatively from various multivitamin-multimineral formulations on zirconium(IV) arsenophosphate columns. The method is simple and selective with a high degree of accuracy and precision.     

Retention Behavior of Metal Ions on Tri-n-Butyl Phosphate and Tri-n-Butyl Amine-Impregnated Silica Gel G Layers: Quantitative Separation of Lead from Other Metal Ions and Synthetic Alloys

JPC – Journal of Planar Chromatography – Modern TLC - The retention behavior of 40 metal ions has been studied on tri-n-butyl phosphate (TBP) and tri-n-butylamine (TBA)-impregnated...     

Thin-Layer Chromatography of Anions — Separation of Coexisting Hexacyanoferrate(II), Hexacyanoferrate(III) and Thiocyanate with a New Mobile Phase

JPC – Journal of Planar Chromatography – Modern TLC - The thin-layer chromatography of eighteen anions has been performed on silica layers with mixed aqueous–organic mobile...     

Quantitative Analysis of Nimesulide in Plasma by Thin-Layer Chromatography: Application to Pharmacokinetic Studies in Man

JPC – Journal of Planar Chromatography – Modern TLC - A thin-layer chromatographic (TLC) method for quantitative analysis of nimesulide in human plasma has been developed, validated,...