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- W2040237002 abstract "The soluble and insoluble hydrolysis products of palladium were investigated in aqueous solutions of 0.6 mol kg−1 NaCl at 298.2 K. Potentiometric titrations of millimolal palladium(II) solutions were used to monitor hydrolysis reactions of the mononuclear PdCl3OH2− and PdCl2OH22- species. Spectrophotometric titrations were also used to corroborate the speciation change and to extract the correlative molar absorption coefficients for the PdCl3OH2− species in the 210–320 nm range. Longer-term potentiometric titrations systematically yielded precipitates which matured over a period of 6 weeks and resulted in a more extensive release of protons to the solution. Precipitation experiments in the 3–11 pH range showed the dominant precipitating phase to be Pd(OH)1.72Cl0.28. EXAFS measurements yielded an average of 3.50 O and 0.50 Cl atoms per Pd atom with a Pd–O distance of 2.012 Å and a Pd–Cl distance of 2.185 Å. Speciation modeling of proton and palladium mass balance data of experiments for palladium concentrations ranging from 0.047 to 10.0 mmol kg−1 required the presence of polynuclear complexes containing 3–9 palladium atoms. The existence of such complexes is moreover supported by previous investigations of palladium hydroxide chains of the type [Pd(OH)1.72Cl0.28]n, that are coiled and/or aggregated into nanometer-sized (15–40 Å) spheroids." @default.
- W2040237002 created "2016-06-24" @default.
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- W2040237002 date "2007-10-01" @default.
- W2040237002 modified "2023-10-03" @default.
- W2040237002 title "The hydrolysis and precipitation of Pd(II) in 0.6molkg−1 NaCl: A potentiometric, spectrophotometric, and EXAFS study" @default.
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- W2040237002 doi "https://doi.org/10.1016/j.gca.2007.08.015" @default.
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