Browsing by Author "V.S. Agarwala"

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Amperometric ascorbimetric determination of cerium(IV) and Iron(III) with two polarized electrodes
(Springer-Verlag, 1961) D. Singh; Asha Varma; V.S. Agarwala
Amperometric ascorbimetric determinations of cerium(IV) and ferric iron have been carried out at 50°C with two polarized electrodes at 200 and 100 mV respectively. The results obtained are fairly accurate and precise within ±1.0 per cent. A simple method for successive determination of cerium and iron has been developed; and conditions for such estimations have been established. At an acidity of 2.5 M with respect to sulphuric acid, it is possible to ward off the reduction of ferric iron and thereby cerium(IV) is successfully titrated with ascorbic acid in this medium. After completion of the reaction and then lowering the acid concentration to pH 1.5 with aid of ammonium hydroxide, FeIII is titrated with standard ascorbic acid yielding good results. © 1961 Springer-Verlag.
Potentiometric Acidimetric Determination of Zirconium
(1963) D. Singh; V.S. Agarwala
The potentiometric acidimetric determination of zirconium is based on the interaction between its hydroxide and KF yielding hydroxide ions which are determined with standard HCl as titrant. This method is not suitable for the estimation of titanium. The presence of Be, Al, La, Th and second group cations interfere. However, the presence of Cr, Ni, Co, Zn and Mn even in larger quantities does not affect the accuracy of the results. The method is quick, simple, specific and yields satisfactory results. Copyright © 1963 Verlag GmbH & Co. KGaA, Weinheim