Santosh K. Majumdar

Liquid-liquid extraction of ironIII with tributylphosphate: Separation from mixtures

Abstract A method is presented for rapid solvent extraction of iron III with tributylphosphate (TBP). Quantitative extraction results from 3–6 M hydrochloric acid, using 100% TBP. The effects of TBP concentration, salting-out agent and diverse ions on the extraction behaviour of iron III have been investigated. The extractable species are FeCl 3 · 3TBP and H[FeCl 4 · (TBP) 2 ] from 2 M and 6 M hydrochloric acid respectively.

Extraction and spectrophotometric determination of cobalt(ii) with 2-thenoyltrifluoroacetone

The rapid extraction and simultaneous spectrophotometric determination of mg amounts of cobalt(II) by means of 2-thenoyltrifluoroacetone is described. The yellow cobalt(II)-TTA chelate solution in acetone-benzene obeys Beers law at 430 mμ over the range 12 to 51 μg of cobalt(II) per ml. At pH 5.1–6.8 a single extraction with 0.15 M TTA in acetone is satisfactory. The system is stable for 96 h. Silver, zirconium, strontium, thorium, zinc, lead(II) and mercury(II) do not interfere.

CATION-EXCHANGE BEHAVIOR OF CALCIUM ON DOWEX 50W-X8. SEPARATION FROM MIXTURES

Abstract The cation exchange chromatography of strontium on Dowex 50W-X8 is described. Nitric acid hydrochloric acid. ammonium chloride, sodium nitrate, ammonium acetate and citric acid were examined as eluants. Strontium can be separated frum important fission products such as caesium zinc, cadmium, silver and zirconium and also from uranium(VI), thorium, bismuth, iron(IIl) copper(Il) and mercury(II).

CATION EXCHANGE BEHAVIOUR OF STRONTIUM ON DOWEX 50W-X8

The cation exchange chromatography of strontium on Dowex 50W-X8 is described. Nitric acid, hydrochloric acid, ammonium chloride, sodium nitrate, ammonium acetate, and citric acid were examined as eluants. Strontium can be separated from important fission products such as Cs, Zn, Cd, Ag, and Zr and also from U/sup 6+/, Th, Bi, Fe/sup 3+/ Cu/sup 2+/and Hg2>s/sup +/. (auth)

Separation of silver, lead and mercuryII by ion-exchange chromatography

Abstract A method has been developed for the ready separation of silver, lead and mercury II from each other by ion exchange chromatography. Lead is eluted with 0.25 M arnmonhim acetate, then silver, and finally mercury II with 0.5 M and 4 M ammonium acetate, respectively.

Thenoyltrifluoroacetone as a reagent for cobalt

SummaryAn indirect method is proposed for the determination of cobalt (II) with 2-thenoyltrifluoroacetone at the milligram level. The orange cobalt-TTA chelate can be quantitatively precipitated over the pH range 4.0–8.0. It is dissolved in acid and estimated as cobalt sulphate. Cobalt(II) can be estimated in presence of silver, mercury(II), strontium, iron(III), chromium (III), thorium, zirconium, uranium, citrate and tartrate. The method is reproducible to within ±1 per cent.

Cation exchange behaviour of mercury (II) on Dowex 50W-X8

SummaryQuantitative studies are reported on the behaviour of mercury at milligram level, using cation exchange resin Dowex 50W-X8. Various eluants such as nitric acid, hydrochloric acid, sulphuric acid, ammonium acetate, sodium nitrate solutions, sodium nitrate-nitric acid mixtures, ammonium acetate-acetic acid mixture are used for column operation. The elution constants are evaluated. Mercury(II) is separated from different cations, i.e., Ca2+, Ba2+, Sr2+, Mg2+, Fe3+, Al3+, Co2+, Ni2+, Zn2+, Cu2+ by selective elution.ZusammenfassungDas Verhalten von mg-Mengen Quecksilber am Kationenaustauscher Dowex 50W-X8 wird quantitativ untersucht. Dabei werden folgende Eluierungsmittel benutzt: Salpetersäure, Salzsäure, Schwefelsäure, Lösungen von Ammoniumacetat und Natriumnitrat sowie die Gemische Salpetersäure-Natriumnitrat und Essigsäure-Ammoniumacetat. Die Elutionskonstanten werden berechnet. Durch selektive Eluierung kann Quecksilber von mehreren Kationen (Ca2+, Ba2+, Sr2+, Mg2+, Fe3+, Al3+, Co2+, Ni2+, Zn2+, Cu2+) getrennt werden.