The use of tannin in the estimation of zirconium and its separation from thorium

Purushottam, A.; Rao, Bh. S. V. Raghava

doi:10.1039/an9507500555

Cited by 7 publications

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“…Tetrachlorophthalic acid is as specific, but much less reagent is required (41). Other organic precipitants are ammonium benzoate (22), benzilic acid (27,57), tannin (46), benzoic acid (47), paradimethylaminoazophenylarsonic acid (51), fumaric acid (55), metani trobenzoic acid (58), cinnamic acid (59), hydrazine sulfate (60), rnetacresoxyacetic acid (56), and cupferron (2a; 65, p.321). A thermogravimetric ana~sis using the precipitate with 8-hydroxyquinoline was unsuccessful (3).…”

Section: Gravimetricmentioning

confidence: 99%

Titrimetric Determination of Zirconium

Fritz¹,

Fulda²

1954

Anal. Chem.

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1~c-382 T h i s r e p o r t i s d i s t r i b u t e d a c c o r d i n g t o t h e c a t e g o r y Chemistry-General a s l i s t e d i n M-3679, April 15, 1953. Macro amounts of zirconium a r e u s u a l l y d e t e r m i n e d g r a v i m e t r ic a l l y o r by t i t r i m e t r i c means f o l l o w i n g q u a n t i t a t i v e i s o l a t i o n o f a p r e c i p i t a t e . T h i s i s time-consuming. T h i s p a p e r d e s c r i b e s a q u i c k , d i r e c t t i t r i m e t r i c method f o r zirconium. The t i t r a t i o n i s Carrie3 o u t i n a c i d s o l u t i o n w i t h Versene (disodium dihydrogen ethylenediaminetetraacetate), a s t a b l e , s o l u b l e complex b e i n g formed. -A v i s u a l i n d i c a t o r g i v e s a s h a r p end p o i n t . Ir,on, thorium, mol-y-bdenum and bismuth c o n s t i t u t e i m p o r t a n t i n t e r f e r e n c e s , b u t most o t h e r metals do n o t a f f e c t t h e r e s u l t s . .Tin and t i t a n i u m , r e d u c e t h e s h a r p n e s s of t h e end p o i n t b u t d o n o t o t h e r w i s e i n t e rf e r e . T h i s method s h o u l d be a p p l i c a b l e t o many s p e c i f i c problems w ISC-382 i t h o u t m o d i f i c a t i o n . I t a l s o c o n s t i t u t e s a new approach t o t h e d e t e r m i n a t i o n o f z i r c o n i u m i n more d i f f i c u l t samples.Most of t h e r e c e n t p r o g r e s s i n a n a l y t i c a l methods f o r macro amounts o f z i r c o n i u m has be,en due t o t h e development o f p r e c i p i t a n t s s u c h a s c u p f e r r o n , mandelic a c i d , and a r s o n O f t h e s e , mandelic a c i d and its d e r i v a t i v e s (6,8,9) a r e p r o b a b l y t h e most s u c c e s s f u l . They p o s s e s s e x c e l l e n t s e l e c t i v i t y f o r z i rconium and under p r o p e r c o n d i t i o n s form p r e c i p i t a t e s o f d e f i n i t e composition. (7) have r e p o r t e d a n amperomet c t i t r a t i o n of zirconium, thorium, t i n and uranium w i t h m-nitropheny s o n i c a c i d . W h i t e (10) developed a t i t r i m e t r i c method f o r zirconium f o l l o w i n g t h e q u a n t i t a t i v e i s o l a t i o n o f zirconium mandelate. Dhar and Das Gupta (1) d e t e r m i n e d zirconium by e i t h e r c o l o r i m e t r i c o r t i t r i m e t r i c means f o l l o w i n g p r e c i p i t a t i o n w i t h oxalohydroxamic a c i d . The d i r e c t $ i t r a t i o n of thorium i n a c i d s o l u t i o n w i t h e t h y l e n e d i a m i n eu s i n g A l i z a r i n Red S i n d i c a t o r has r e c e n t l y been r e p o r t Zirconium i n t e res i n t h i s t i t r a t i o n t e t r a a c e t i c a c i d (Ve b u t cannot i t s e l f be t i t r a t e d , by t h e t h o r i u r o c e d u r e . MOW9 however, new i n d i c a t o r s have'bee'n found, which p e r m i t t h e r a p i d andThe method proposed t i v e and s h o u l d b e -o f use i n numerous cases. ,omplex must be less s t a b l e t h a n t h e zirconium-Versene complex. F u r t h e r , r e a c t...

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Section: Gravimetricmentioning

confidence: 99%

Titrimetric Determination of Zirconium

Fritz¹,

Fulda²

1954

Anal. Chem.

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“…Rao and coworkers used hydrazine sulfate (175), phthalic acid (148), tannin (147), and fumaric acid (172) for the precipitation of zirconium. Hydrazine sulfate could be used for the separation of zirconium from thorium at pH 2.8.…”

Section: Steel Forming Elementsmentioning

confidence: 99%

Inorganic Gravimetric Analysis

Beamish¹

1952

Anal. Chem.

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Tannin as a reagent for zirconium

Purushottam

Rao

1951

Recl. Trav. Chim. Pays‐Bas

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The use of tannin in separating zirconium from other elements has been investigated. With the exception of tin and titanium almost all elements commonly associated with zirconium may be separated in a single or a double precipitation in 0.1 N to 0.15 N-hydrochloric acid solution. It is shown further that tannin gives a definite turbidity with as little as 0.002 mg of 210, per ml and quantities of 0.6 mg and over may be conveniently estimated with the reagent.Tannin was first introduced by Schoeller and Powell 1) for the separation of the acid earths, niobium and tantalum. Later Schoeller 2 ) extended its use to the preferential precipitation of zirconium. A more detailed investigation was undertaken by Schoeller and Holness '3). Recently we have modified Schoeller's method for the separation of zirconium from thorium 4 ) . T h e findings of Holness and Kear 5 ) are not quite in accordance with those of Schoetler especially as regards coprecipitation of aluminium. While Schoeller found that aluminium is coprecipitated with zirconium from 0.1 N-hydrochloric acid solution. the former authors claimed complete separation in a single precipitation from solutions just acid to methyl orange. In an attempt to reconcile the two observations however, Schoeller and Holness 3 ) surmised, in slow formation of precipitates a behaviour different from what occurred in sudden formation but no definite picture of the mechanism was put forward. While a fuller investigation of this aspect would be desirable, precipitation in two stages as employed by Schoeller and his collaborators possesses a certain disadvantage. Neutralization in the second stage of precipitation calls for extreme caution. A procedure involving definite experimental conditions offers several advantages. In this work, the behaviour of a number of common and 1) A. R.

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The use of tannin in the estimation of zirconium and its separation from thorium

Cited by 7 publications

References 0 publications

Titrimetric Determination of Zirconium

Titrimetric Determination of Zirconium

Inorganic Gravimetric Analysis

Tannin as a reagent for zirconium

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