Influence of temperature on the ion-exchange properties of stannic arsenate

Qureshi, Mohsin; Rathore, H. S.; Kumar, Rajendra

doi:10.1016/s0021-9673(01)80274-0

Cited by 14 publications

(10 citation statements)

References 5 publications

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“…The weight again becomes constant in the 550 to 600°C region indicating complete vaporization of selenium. The capacity of the material at 550°C almost coincides (0.50 meq/g) with that of stannic arsenate (0.52 meq/g dried at 600°C) (2). The further loss in weight above 600°C may be due to the loss of water molecules by condensation of the third type of OH groups along with the loss of arsenic by vaporization.…”

Section: Dfscussionmentioning

confidence: 66%

Studies on Stannic Selenoarsenate. II. Separation of Uranium from Numerous Metal Ions

Nabi

Siddiqi

Rao

1982

Separation Science and Technology

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Stannic selenoarsenate has been synthesized by adding 0.05 M sodium selenite and 0.05 M sodium arsenate to a 0.05 M solution of stannic chloride in a volume ratio of 1:l:l at pH 1. A tentative structure has been proposed on the basis pf chemical composition, pH titrations, and infrared and thermogravimetric analyses. Distribution coefficients of several metal ions have been studied in hydrochloric acid, citric acid, ammonium citrate-citric acid, and water-dioxane systems. The unusual adsorption behavior of uranium has been utilized for its quantitative separation from several metal ions.

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Section: Dfscussionmentioning

confidence: 66%

Studies on Stannic Selenoarsenate. II. Separation of Uranium from Numerous Metal Ions

Nabi

Siddiqi

Rao

1982

Separation Science and Technology

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“…EXPERIMENTAL Apparatus. All instrumentation was the same as that used in our earlier papers (8)(9)(10).…”

Section: Resultsmentioning

confidence: 99%

“…The Kd values, the saturation ion-exchange capacity for K~, the pH-titration curves, X-ray, and IR studies were made as reported earlier (8,9). For conductometric and high frequency titrations, 2 ml of 0.10M sodium selenite solutions were taken in the cell, diluted to 100 ml with water, and titrated with 0.10M titanic chloride solution.…”

Section: Resultsmentioning

confidence: 99%

New method for determination of 21-hydroxy corticosteroids

Gǒrög¹,

Szepesi²

1972

Anal. Chem.

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Energy after etchings, MeV Irradiation time, min Chemical separation Oxygen content, Ag/g 11.8 20 Without 0.23 ± 0.02 11.8 20 Elimination of Na on 0.19 ± 0.02 11.5 35 hydrated Sb2Os Steam distillation of 0.23 ± 0.02 11.1 20 H2SiF6 Without 0.20 ± 0.02 10.7 20 Elimination of Na on 0.23 ± 0.02 10.0 20 hydrated Sb205 Without 0.20 ± 0.02 8.2 15 Without 0.21 ± 0.02 8.2 15 Without 0.23 ± 0.02 12.0 20 Zone Refined Aluminum Without <0.04 11.6 15 Without <0.04 11.4 60 Without <0.05Sodium can be separated by its retention on hydrated antimony pentoxide ( 19) after dissolving the sample in hydrochloric acid (6N). Fluorine, partially retained in the absence of aluminum (20), is completely eluted in the presence of this element. We have confirmed, by steam distillation of hydrofluoric acid at 200 °C ( 21), that the period of 110 minutes really corresponds to fluorine-18 (Figure 3). RESULTSThe oxygen content was calculated using the so-called "equivalent thickness" method ( 22) and the activation curve determined by Markowitz. The results obtained are presented in Table II.The only detectible half-life in the case of the purest aluminum samples (zone refined aluminum) is 15 hours correspond-(19) F. Girardi and E.

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“…Tin dioxide is an amphoteric exchanger with strong affinity for phosphate ions and UO2 (127). Tin(IV) phosphate (118,121,162) and arsenate (113,407,408) have been prepared in crystalline form, and separate alkali and alkaline earth metal ions. Lanthanide ions are strongly absorbed.…”

Section: Techniquesmentioning

confidence: 99%

“…Lanthanide ions are strongly absorbed. Tin arsenate gives good separations of lead (strongly absorbed) from zinc and manganese (407,408), and tin molybdate separates Fe(III) from Al, Mn(II) from Fe(III), and many other elements from one another. Tin(IV) ferrocyanide has the formula (SnO)g(OH)3HFe-(CN)e-3H20 and is selective for the alkali and alkaline earth ions.…”

Section: Techniquesmentioning

confidence: 99%

Ion exchange

Walton¹

1972

Anal. Chem.

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West European journals directly, in some cases through December 1971. We very much regret that the extensive Russian and Japanese literature had to be followed through abstracts or translations. Many 1969 publications are included; we have coordinated them with our 1970 review to avoid duplication. We have not attempted to include every reference to ion exchange in chemical analysis, and have deliberately passed over many publications that seemed to add only minor details to well-known procedures. As before, we have included a number of references to the basic physical chemistry of ion exchange.A notable trend over the past two years has been an increase in applications to organic compounds and compounds of biochemical interest. Interactions with ion-exchanging materials that do not depend on electrostatic forces are being consciously exploited and better understood. Many of the chromatographic separations of organic compounds listed below are not, in the strict sense of the word, ion-exchange separations, though they use ion-exchanging polymers and inorganic mate-

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Influence of temperature on the ion-exchange properties of stannic arsenate

Cited by 14 publications

References 5 publications

Studies on Stannic Selenoarsenate. II. Separation of Uranium from Numerous Metal Ions

Studies on Stannic Selenoarsenate. II. Separation of Uranium from Numerous Metal Ions

New method for determination of 21-hydroxy corticosteroids

Ion exchange

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