Die Verteilung der Tetraphenylarsoniumverbindungen anorganischer Anionen zwischen wäßrigen Lösungen und Chloroform

Böck, Rudolf; Beilstein, G.

doi:10.1007/bf00465753

Cited by 36 publications

(9 citation statements)

References 13 publications

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“…-1 + 3n (10) As the solutions of metal ion and reagent in neutron-activation analysis separations usually have concentrations near 10" 2 mole I" 1 , Equation 10 becomes p H * n 5nJ (11) For iron (III) cupferrate, pAT s = 25,…”

Section: A the Precipitation Methodsmentioning

confidence: 99%

“…Since few of the reagents are specific, the primary consideration is to improve the selectivity for the desired element. The optimum conditions can be derived from the equation for the extraction process: n(HA) o r g (12) The extraction constant ^e x t , is given by (13) *The notation is intended to emphasize that the concentration c expressed in moles B" 1 must be divided by moles fi" 4 where c H A is the original concentration of HA in the organic phase. In these conditions the total amount of complexed metal is given by C HA x oig' w h e r e ^orgis the volume of solvent, and the total amount of the metal left unreacted in the aqueous phase, [M n+ ] F a q ) is given by…”

Section: B Solvent Extraction Of Metal Chelatesmentioning

confidence: 99%

See 1 more Smart Citation

Principles and Applications of Substoichiometric Techniques of Analysis

Baishya¹,

Heslop²,

DeVoe³

1971

C R C Critical Reviews in Analytical Chemistry

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Section: A the Precipitation Methodsmentioning

confidence: 99%

Section: B Solvent Extraction Of Metal Chelatesmentioning

confidence: 99%

Principles and Applications of Substoichiometric Techniques of Analysis

Baishya¹,

Heslop²,

DeVoe³

1971

C R C Critical Reviews in Analytical Chemistry

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“…In particular, monovalent complex anions and voluminous oxoanions are well extracted in the form of ionic pairs, e.g., with quaternary ammonium base 1,2 and other elementoorganic and organometallic compounds of "onium" type. 3 10 Unlike the first case when tetraphenylammonium base probably does not exist (respectively is not known), tetraphenylphosphonium, tetraphenylarsonium 4 and tetraphenylstibonium 1~ represent extraction agents effective for several anions. In difference to the last stated, divalent bases as triphenylarsenic dihydroxide and triphenylantimony dihydroxide react with monohydric (HA) and polyhydric (HnA) acids like monobasic compounds yielding hydroxycompounds of type: Ph3Sb(OH)H~IA (where Ph = C6H5) which, however, are badly extracted into chloroform.…”

Section: Introductionmentioning

confidence: 92%

Extraction of pertechnetate by triphenyltin chloride and trioctyltin chloride

Kopunec

Abudeab

1998

J Radioanal Nucl Chem

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The extraction of pertechnetate in form of ionogene associates with triphenyltin and trioctyltin cations into chloroform, benzene, toluene and nitrobenzene was studied. As aqueous phases solutions of 99mTcO4 in deionized water and in diluted solutions of NaC1, HC1, NaNO3, HNO 3 NaC10+ HC104 and NaOH were used. Concerning the organic phases, at the use of triphenyltin chloride the extractibility of pertechnetate increases in the sequence: toluene (~ chloroform, benzene < nitrobenzene and approximately in the sequence: NaOH < NaC1, HC1 < NaNO3< H20 < NaC104 concerning aqueous phases. For trioctyltin chloride in chloroform the extractibility of TcO 4 increases approximately in the sequence of aqueous phases : NaOH < HC1, NaNO3, NaC104, NaC1 (~ H20 and in nitobenzene in the sequence NaOH < NaC104< HC1 < NaNO3, NaC1 (~ H20. The extractibility for trioctyltin chloride is in general slightly lower as compared with triphenyltin chloride. The results of the extraction are presented in the form of graphical plots of technetium distribution ratio (DTc, log DTc ) or extraction yield (ETc, %) against concentration of the investigated component in aqueous or organic phase. In some of the systems studied practically quantitative extraction ofpertechnetate into organic phase has been achieved.

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“…En este caso, se han empleado tanto reactivos neutros, como el fosfato de tributilo (TBP) en medio sulfúrico (13 y 14), como reactivos de carácter básico tales como diversas aminas, sales de amonio cuaternario (15)(16)(17)(18)(19)(20)(21)(22)(23)(24) y compuestos afínes a éstas, como la trioctil fosfina (25) y los compuestos de tetrafenilarsonio (26), tetrafenilfosfonio (27) y trifenilsulfonio (28).…”

Section: De Juan Et Al / Extracción De Cromo Con Disolventes Orgáunclassified

Extracción de cromo con disolventes orgánicos. I parte. Extracción con DEHPA

1998

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Resumen El cromo y sus compuestos confieren un carácter tóxico y/o peligroso a los residuos industriales, sólidos o líquidos, que los contienen. Una técnica que permite recuperar el cromo existente en estas sustancias es la extracción con disolventes orgánicos. En el presente trabajo se estudia la extracción del Cr(III) presente en disoluciones acuosas con disoluciones de un reactivo de carácter catiónico (DEHPA) en queroseno. Igualmente se estudia el proceso de reextracción. Se ha encontrado que el Cr(III) y el DEHPA reaccionan mol a mol, siendo la cinética de extracción muy rápida. El pH final de la fase acuosa influye considerablemente sobre el rendimiento de extracción, por lo que es conveniente trabajar con valores del pH comprendidos entre 3 y 4. Para evitar la formación de tercera fase en reextracción se debe adicionar un modificador (isodecanol) a la fase orgánica en una concentración superior al 15 %, por lo que la fase orgánica empleada fue una disolución de DEHPA 12,5 % v/v en queroseno e isodecanol 20 % v/v. El proceso de reextracción es lento y se debe realizar en medio alcalino oxidante, para lo que se empleó una disolución acuosa de NaOH y H 2 0 2 . El rendimiento de reextracción aumenta inicialmente al aumentar las concentraciones de NaOH y de H 2 0 2 y permanece prácticamente constante para concentraciones en NaOH y H 2 0 2 superiores a 0,45 N y 4 % v/v respectivamente.Palabras clave: Extracción con disolventes. DEHPA. Cromo. Tratamiento de efluentes. Chromium extraction with organic solvents Part 1. Extraction with DEHPA AbstractChromium and its compounds give toxic and/or hazardous characteristics to all those industrial wastes, solids or liquids, that contain them. Organic solvent extraction is a technique that allows the recovery of chromium contained in these residues. In this work the extraction of Cr(III) from aqueous solutions with solutions of a cationic reactive (DEHPA) in kerosene is studied. In the same way the stripping process was studied. It has been found that Cr(III) and DEHPA react in a 1/1 molar ratio, being the extraction kinetics very fast. Final aqueous phase final pH influence extraction yield, so that it is necessary to work with pH valúes between 3 and 4. It must be added a modifier (isodecanol) to the organic phase to avoid the formation of a third phase in the stripping process. The concentration of isodecanol has to be higher than 15 %, so the organic phase used was a solution of 12.5 % v/v DEHPA in kerosene and 20 % v/v isodecanol. The stripping process is slow and must be carried out in an oxidant alkalyne médium, thus an aqueous solution of NaOH and H 2 0 2 was used. An increase in the concentration of NaOH and H 2 0 2 leads to an increase in the stripping yield initially, and becomes stable when concentrations of NaOH and H 2 0 2 used are higher than 0.45 N and 4 % v/v respectively.

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Die Verteilung der Tetraphenylarsoniumverbindungen anorganischer Anionen zwischen wäßrigen Lösungen und Chloroform

Cited by 36 publications

References 13 publications

Principles and Applications of Substoichiometric Techniques of Analysis

Principles and Applications of Substoichiometric Techniques of Analysis

Extraction of pertechnetate by triphenyltin chloride and trioctyltin chloride

Extracción de cromo con disolventes orgánicos. I parte. Extracción con DEHPA

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