Browsing by Author "G.S. Deshmukh"

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2.4-Dinitrophenylhydrazone of diacetylmonoxime: A new sensitive reagent for cobalt
(Springer-Verlag, 1959) V.D. Anand; G.S. Deshmukh
[No abstract available]
A new method for the standardisation of hypobromite
(Springer-Verlag, 1959) G.S. Deshmukh; S.V. Tatwawadi
The oxidation of ferrocyanide by hypobromite and the optical density of the yellow colour of ferricyanide thus developed has been studied with the aid of a Hilger Spekker Absorptiometer Model H 760. A violet filter having maximum transmission in the range of 420-450 m μ was used. Series of experiments showed that quantitative oxidation of ferrocyanide occurred in the pN range 8-8.5 (bicarbonate buffer) and the colorimetric titration may be used for the standardisation of hypobromite. The results compared favourably with those obtained by amperometric titration of hypobromite against sodium arsenite as a primary standard. © 1959 Springer-Verlag.
A new micro-test for germanium
(Springer-Verlag, 1955) G.S. Deshmukh
[No abstract available]
A new volumetric method of cerium determination by thiocyanate
(1953) G.S. Deshmukh
A new volumetric method for cerium determination, based on the reduction of ceric sulphate by potassium or ammonium thiocyanate added in excess and the determination of the excess by back-titration as in Volhard's method is developed. One molecule of KCNS reacts with six molecules of Ce(SO4)2; the sulphur atom of the thiocyanate is oxidized to sulphate. Ce... and SO4″ ions in moderate quantities and the usual rare earth impurities in ceric sulphate do not affect the accuracy of the method. The possibility of using ceric sulphate in the determination of small quantities of thiocyanate and in argentometric titration is suggested. © 1953 Indian Academy of Sciences.
Alkaline iodine as an oxidant for thallium (I)
(Springer-Verlag, 1955) G.S. Deshmukh
The use of alkaline iodine for the determination of TlI has been described. The hypoiodite oxidises TlI to TlIII and the excess oxidant is converted into iodide and iodate which on acidification liberates quantitatively the unreacted iodine. The difference in the initial and back titre value of thiosulphate serves for the direct calculation of the thallium content. The results show a good agreement with the data obtained by a parallel gravimetric and iodometric determination of TlIII. © 1955 Springer-Verlag.
Amperometric determination of calcium as selenite
(Springer-Verlag, 1965) G.S. Deshmukh; O.P. Asthana; P.A. Rajan
An amperometric titration of calcium with selenite is described. Barium, strontium, and other cations forming insoluble selenites interfere, but magnesium does not. The method is rapid and suitable for routine analysis, the error being less than 10 parts per 1000 over the range 50 to 70 mg of calcium. © 1965 Springer-Verlag.
Amperometric determination of copper, cadmium and nickel and their binary mixtures with methyldithiobiuret
(Springer-Verlag, 1969) G.S. Deshmukh; R.K. Nandi
Copper, cadmium and nickel have been estimated amperometrically in ammoniacal ammonium tartrate and potassium nitrate (pH ∼ 8.0-9.5) using methyldithiobiuret as the titrant. The advantage of the oxidation potential of the reagent have been put to a practical use in these determinations. Furthermore, by the combined use of the cathodic current of a reducible ion (Cu2+) and the anodic current of the reagent simultaneous determination of the two components of binary mixtures (e.g., copper-cadmium and copper-nickel) in a single operation has also been achieved. The process is rapid and yields reproducible results within the limits of experimental errors. © 1969 Springer-Verlag.
Amperometric determination of copper, lead and zinc in a mixture with K-dithiotrihydroxymethyl aminomethane
(Springer-Verlag, 1975) G.S. Deshmukh; H. Chaudhuri; H.S. Mahanti
[No abstract available]
Amperometric determination of metals forming normal selenites
(Springer-Verlag, 1959) G.S. Deshmukh; M.G. Bapat; E. Balakrishnan; M.C. Eshwar
A new procedure for the quantitative determination of Ag, Hg and Pb has been described. This is based on the precipitation, under appropriate conditions of their normal selenites and titrating amperometrically the excess SeIV against NaOBr after filtering the precipitate. In this respect the method is almost analogous to the volumetric determination of the above metals after precipitating their pyridine thiocyanate complexes. © 1959 Springer-Verlag.
Amperometric determination of Se(IV) with lead(IV) acetate
(Springer-Verlag, 1974) G.S. Deshmukh; V.N. Choudhury
[No abstract available]
Amperometric determination of thorium as selenite
(Springer-Verlag, 1962) G.S. Deshmukh; O.P. Asthana
Amperometric titration of thorium as selenite in a base electrolyte consisting of 0.9 M ammonium acetate in 60-70 per cent alcohol (p h 6.2-6.4) has been described. The titration is carried out at -1.0 V vs. S.C.E. A reversed L-type of curve is obtained and the formation of a normal selenite is suggested. The accuracy of the procedure is comparable with that obtained with other classical methods. © 1962 Springer-Verlag.
Amperometric determination of vanadium as vanadyl selenite
(Springer-Verlag, 1962) G.S. Deshmukh; O.P. Asthana; V.S.N. Pillai
An amperometric titration procedure for the determination of vanadium as selenite in 0.044 M ammonium acetate and 50-55 per cent alcohol at a pH between 5.3-5.5 has been described. The titration is carried out at -1.10 V versus S.C.E. A V-shaped curve is obtained. The molar ratio of Se:V (1:1) supports the formation of a normal selenite VOSeO3. © 1962 Springer-Verlag.
Amperometric determination ot bivalent tin with dichromate
(Springer-Verlag, 1963) G.S. Deshmukh; S.V.S.S. Murty
An amperometric determination of tin with potassium dichromate has been described. The advantage of the cathodic polarograms of Cr2O27- and Sn2+ in formate media was taken and titrations were performed at -0.8 V vs. S.C.E. at pH ≈3.0. It is shown that tin upto 10 mg may be determined accurately within the limits of experimental errors. © 1963 Springer-Verlag.
Amperometric titration of selenite with hypobromite
(Springer-Verlag, 1958) G.S. Deshmukh; M.G. Bapat; E. Balkrishnan; M.C. Eshwar
[No abstract available]
Amperometric titrations with the help of selenites - Determination of cobalt
(Springer-Verlag, 1961) G.S. Deshmukh; V.D. Anand; A. Joseph
A new procedure for rapid amperometric titration of cobalt based on precipitation of cobalt as the normal selenite is described. Potassium chloride (0.1 M) containing 0.01% gelatin as the maximum suppressor has been used as the supporting electrolyte. The use of 50% overall concentration of methanol was found essential for these titrations. The concentration of alcohol necessary for cobalt concentrations below 2 millimolars was 70%. The titrations have been performed at an applied potential of -1.5 volts vs. S.C.E. Effect of methanol on the equivalence point of the titration has also been studied. The procedure described gives accurate results, which agree well with the formula CoSeO3 for the normal selenite of cobalt. © 1961 Springer-Verlag.
An effect of light in gases under electrical discharge [3]
(1941) S.S. Joshi; G.S. Deshmukh
[No abstract available]
Application of the two stage ascorbic acid-iodate titration to the determination of iodine and iodide
(Springer-Verlag, 1955) G.S. Deshmukh; M.G. Bapat
An extension of the two stage titration of ascorbic acid against iodate to the determination of iodine and iodide in a solution is described. A known excess of ascorbic acid, standardized against iodate, is added to a mixed iodine and iodide solution and the excess ascorbic acid together with the total iodide is titrated against the same iodate to the two end points under controlled conditions of acidity. The differential method of calculation gives the amount of iodine and iodide with a blank and a direct titration. The accuracy of the results provides a useful evidence for the mechanism suggested for the two stage titration of ascorbic acid against iodate. © 1955 J. F. Bergmann.
Bromometric determination of vanadium (V) by hydrazine
(1956) G.S. Deshmukh; M.G. Bapat
A method for the quantitative determination of vanadium(V), based on the reduction of vanadium(V) by hydrazine, has been described. The reduction is carried out in high concentration of hydrochloric acid and the excess hydrazine back-titrated against standard potassium bromate, using the dead-stop end-point procedure. Hydrazine is preferentially oxidized by bromate in presence of vanadium(IV). Accurate results have been obtained over a wide range of vanadium(V) concentration. © 1956.
Cerimetric determination of metals forming pyridine thiocyanate complexes
(Springer-Verlag, 1963) G.S. Deshmukh; A.L.J. Rao
A new procedure for the quantitative determination of Cu, Co, Ni and Cd has been described. It is based on the precipitation of the metals as pyridine thiocyanate complexes and titrating the excess thiocyanate with ceric sulphate using dead stop end point method or the usual visual end point method with vigorous stirring. © 1963 Springer-Verlag.
Conductometric and ph studies on cobalt tellurite
(Springer-Verlag, 1960) G.S. Deshmukh; V.D. Anand; A.K. Vishwanath
Conductometric and pH titration procedures for the determination of cobalt over a wide range of concentrations of cobalt solutions are described. Direct, as well as reverse titration procedure are shown to be possible and the effect of varying ethanol concentrations is reported. Both conductometric and pH studies lend support to the 1:1 molar ratio of Co and Te. © 1960 Springer-Verlag.