Anil K. De

Solvent extraction and separation of gallium(III), indium(III), and thallium(III) with tributylphosphate

A systematic study has been made of the solvent extraction behaviour of milligram amounts of gallium(III), indium(III), and thallium(III) with TBP from hydrochloric acid, and of thallium(III) from nitric acid, sulphuric acid and buffer solutions of different pH. The effect of the metal ion concentration, acid concentration, reagent concentration, salting-out agent, and diverse ions have been critically examined. A scheme for separation of gallium(III), indium(III), and thallium(III) from each other and for their determination is proposed.

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 BEHAVIOUR OF URANIUM(VI) ON AMBERLITE IR-120. SEPARATION FROM MIXTURES

Abstract Quantitative studies are reported on the cation-exchange behaviour of uranium(VI) at the milligram level with Amberlite IR-120. Hydrochloric, nitric, sulphuric, perchloric, acetic and citric acids were tested as cluants; 200–300 ml of 2 N hydrochloric, nitric or sulphuric acid suffice for quantitative elution of 17 mg of uranium(VI) from a 1.4 cm X 14 5 cm bed The efficiency of the elutmg agents is discussed in terms of their elution constants Uranium is separated from thorium by selective elution, from zirconium, cerium(III), copper and nickel by converting the latter into suitable anionic complexes and from phosphate just by passing the mixture through the cation exchanger.

Rapid extraction of iron(III) with 2-thenoyl trifluoroacetone : Direct colorimetric determination in the organic phase

Abstract 2-Thenoytrifluoroacetone is investigated for the rapid extraction and spectrophotometric determination of iron(III) at the milligram level. The red extract absorbs strongly below 400 mμ. The color is stable for many hours, Beers law is obeyed at 460 mμ for 1–10 μg of iron/ml. Interferences are studied. The method is reproducible to ±1%.

Rapid extraction of copper(II) with 2-thenoyltrifluoroacetone direct colorimetric determination in the organic phase

SummaryThe chelating agent, 2-thenoyltrifluoroacetone has been employed for rapid extraction and colorimetric determination of milligram amounts of copper(II) in one operation. At pH 2.4–6.0 copper(II) is extracted quantitatively from an aqueous solution by TTA-benzene in a single extraction. The green-coloured copper(II)-TTA chelate solution in benzene obeysBeers law at 430 mμ over the range of 16–180μg copper per millilitre. The coloured system is stable for 143 hours. It can tolerate silver, mercury(II), bismuth (<5 mg) and small amounts (<100 mg) of citrate and tartrate, whereas cobalt(II), nickel(II), iron(III), aluminium(III), cerium(IV), thorium and zirconium seriously interfere. The proposed method is reproducible to within ±1.4%.

Liquid-liquid extraction of tungsteniv with tributyl phosphate

Abstract A new method has been developed for the rapid extraction of tungstenIV with tributyl phosphate (TBP). Quantitative extraction occurs from 8-10M hydrochloric acid using 100% TBP. Tungsten is finally determined spectrophotometrically as thiocyanate. The extractable species is probably WO2Cl2.2TBP. There are very few interferences. The method is shown to be applicable to an alloy steel.

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).

Anion exchange studies of zirconium(iv) in citrate solution separation from mixtures

Abstract The anion exchange behaviour of zirconium(IV) in a citrate system is described. Nitric acid, hydrochloric acid, perchloric acid and ammonium chloride were tested as eluants on Dowex 21 K column. Zirconium is separated from fission product elements e.g. , barium, strontium, cadmium, caesium, molybdate and also from lead.

Cation-exchange studies of leadII on dowex 50w-x8: Separation from mixtures

The cation exchange behaviour of milligram amounts of vanadium on Dowex 50W-X8 has been studied using different eluants. Quantitative elution can be achieved by 200 ml of 0.5N hydrochloric acid, 1–2N sulphuric acid, 2–3N phosphoric acid or 0.5–1N ammonium chloride solution. The relative efficiency of eluants is discussed in terms of their elution constants and bed distribution coefficients. Vanadium has been separated from copper(II), iron(III), cobalt(II), nickel, zinc, zirconium (IV), aluminium, cerium(IV), uranium(VI), thorium(IV), manganese(II), titanium(IV), and from phosphate.