B D Jain
Articles written in Proceedings – Section A
Volume 53 Issue 3 March 1961 pp 147-150
3-Acetyl-4-hydroxycoumarin has been used for the gravimetric determination of zirconium and titanium. This reagent precipitates zirconium quantitatively between pH 3·5 and 7·0, and titanium between pH 7·0 and 0·0.
Volume 54 Issue 6 December 1961 pp 341-344
The gravimetric determination of uranium and thorium alone, as well as in the presence of about ten times the amount of cerium (III) and lanthanum, can be readily carried out by using 1-hydroxy-xanthone as complexing agent.
Volume 55 Issue 4 April 1962 pp 213-215
Volume 56 Issue 5 November 1962 pp 269-273
Lanthanum, gadolinium and yttrium are quantitatively precipitated by diammonium-5, 5′-indigo disulphonate between pH 3·0 and 7·5 and the resulting complexes on ignition give the corresponding oxide which can be weighed. Quantities as little as 4·75 mg. of La2O3, 3·3 mg. of Gd2O3 and 4·2 mg. of Yt2O3 can be thus determined.
Volume 56 Issue 5 November 1962 pp 285-290
6-Methyl pyridine-2-aldoxime produces with iron (II) solution a deep red complex soluble in 50% (by volume) aqueous acetone. The complex is stable at 10–45°C. and its colour intensity does not vary between pH 7·3 and 10·0. The complex obeys Lambert-Beer’s law at 520 mµ in the concentration range of 1·12 to 28·0 p.p.m. of iron.
Volume 57 Issue 3 March 1963 pp 142-147
Rutin has been used for the spectrophotometric determination of vanadium (V). Vanadium (V) forms with rutin an orange water-soluble complex, which obeys Lambert-Beer’s law at 435 m
Volume 59 Issue 3 March 1964 pp 185-189
3-Phenyldaphnetin (3-phenyldihydroxycoumarin) in ethanolic solutions forms water-soluble orange-yellow-coloured complex with uranium (VI) solutions. The complex obeys Lambert-Beer’s law up to 9 p.p.m. of uranium in solution and has the composition 1:1. Stability constant of the complex has been determined and concentration limits of interfering ions that can be tolerated have been stated. A possible use of 3-phenyldaphnetin for the spectrophotometric estimation of uranium (VI) has been suggested.
Volume 59 Issue 6 June 1964 pp 362-364
A method for the separation and gravimetric determination of zirconium in presence of iron (II) is described. Zirconium is quantitatively precipitated on addition of 1% alcoholic solution of 4-phenyldaphnetin at pH 1·8–2·0 and the yellow-coloured zirconium complex is ignited and zirconium estimated as oxide. Interference due to foreign ions and I.R. spectrum of the complex has been studied.
Volume 60 Issue 2 August 1964 pp 85-89
4-Hydroxy-3-methoxy benzaldehyde (vanillin) precipitates titanium quantitatively between pH 3·5 and 6·5. The precipitate on ignition gives TiO2 which can be weighed. Titanium can be readily separated and estimated gravimetrically in the presence of chromium (III), cobalt (II), copper (II), iron (III), manganese (II), molybdenum (VI), nickel (II), tungsten (VI), uranium (VI), vanadium (V), zinc (II), zirconium (IV), and trivalent rareearths.
Volume 60 Issue 4 October 1964 pp 265-270
3-Benzyl-4, 5-d’hydroxycoumarin has been used for the spectrophotometric determination of titanium (IV). It forms a deep orange red complex with titanium (IV) and the complex is stable at pH 1·8–2·5. The system obeys Lambert-Beer’s law at 380 m
Volume 63 Issue 6 June 1966 pp 356-360
Bis-2-pyridyl glycol has been used for the gravimetric determination of uranium, aluminium and beryllium. The reagent quantitatively precipitates uranium from uranyl nitrate solution at pH 5.0–8.0, aluminium from potash alum solution at pH 5.2–8.5 and beryllium from beryllium sulphate solution at pH 7.5–9.5. The precipitate in each case is ignited to the corresponding oxide and weighed.
Volume 64 Issue 3 September 1966 pp 182-184
Vanillin, quantitatively precipitates zirconium between pH 5·0–6·5, as insoluble complex. This complex on ignition gives ZrO2 which can be weighed. Zirconium can be readily separated and determined in the presence of varying quantities of chromium (III), cobalt (II), copper (II), manganese (II), molybdenum (VI), nickel (II), titanium (IV), tungsten (VI), uranium (VI), vanadium (V), zinc (II) and trivalent rare earths.
Volume 64 Issue 4 October 1966 pp 245-248
The spectrophotometric studies of uranium (VI)-pongamol complex have been carried out in 50% aqueous ethanolic solutions. Pongamol produces a yellow complex with an aqueous uranyl salt solution, the complex is soluble in 50% aqueous ethanol. The complex is quite stable for 24 hours, the optical density remaining constant at pH 5·6–7·1. The complex obeys Beer-Lambert’s law at 390 mµ in the concentration range of 1 to 5 p.p.m. of uranium in solution. The molar composition of the pongamol uranium (VI) complex has been found to be 2:1, and its tentative structure has been suggested. The cations and anions which interfere in the estimation of uranium using pongamol have been indicated.
Volume 67 Issue 4 April 1968 pp 208-214
An aqueous solution of
Volume 68 Issue 2 August 1968 pp 88-92
Using oximidobenzotetronic acid (OBTA) as a reagent, iron (II) has been separated and accurately determined gravimetrically in presence of 10-fold or more of Mn(II), Al(III), Cr(III), Ti(IV), Zr(IV), Th(IV), Ni(II), Zn (II), Mo (VI), Ca (II) Mg(II), tartrate, citrate, acetate, phosphate, sulphocyanide, fluoride W (VI), Cu (II), Bi (III) and Sn (II). Ce (IV), Ce (III), Co (II), V (V) and EDTA, however, interfere in the determination.