Donnan dialysis of bromocomplexes of some platinum group metal ions

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Analytical Letters; (USA)

DOI:https://doi.org/10.1080/00032718908051364· OSTI ID:7172017

Brajter, K; Slonawska, K ^[1]; Cox, J A ^[2]

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1. Univ. of Warsaw (Poland)
2. Miami Univ., Oxford, OH (USA)

The separation of bromocomplexes of platinum group metals by Donnan dialysis is demonstrated with both anion and cation exchange membranes. The inclusion of ethylenediamine (en) in the sample improves the separation of Pd(II) from Pt(IV) with experiments performed with an anion exchange membrane and decreases the amount of metal retained on the membrane phase. With a cation exchange membrane, the addition of a ligand such as en is required for transport. With 5.6 mM en in the sample at pH 10, 74% of Pd(II) is transported across an anion exchange membrane into 0.5 M NH{sub 4} Br after 6 hours while only 8% of the Pt(IV) is dialyzed. Rhodium(III) and iridium(III) behave like Pt(IV). Using a cation exchange membrane under the same conditions except with a 1 hour dialysis results in a 30-fold preferential preconcentration of Pd(II) relative to Pt(IV), and, based on the amount retained in the membrane, a preconcentration of Ir(III) which exceeds that of Pd(II) and Pt(IV) by factors of 40 and 20, respectively.

• OSTI ID: 7172017
• Journal Information: Analytical Letters; (USA), Journal Name: Analytical Letters; (USA) Vol. 22:3; ISSN ANALB; ISSN 0003-2719
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360000* -- Materials
360600 -- Other Materials
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000 -- Chemistry
400200 -- Inorganic
Organic
& Physical Chemistry
DATA
DATA ANALYSIS
DIALYSIS
DONNAN THEORY
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
PALLADIUM
PLATINUM
PLATINUM METALS
SEPARATION PROCESSES
TRANSITION ELEMENTS