Element distribution coefficients for hydrofluoric acid/nitric acid solutions and the anion exchange resin Dowex 1X8

Faix, W. G.; Caletka, R.; Kriváň, V.

doi:10.1021/ac00234a043

Cited by 39 publications

(14 citation statements)

References 9 publications

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“…Furthermore, we provide 180 W measurements of a bulk CI chondrite Ivuna and a CAI from CV3 chondrite NWA 8722. Sample preparation methods were modified from previously established procedures (Kraus et al 1955;Faix et al 1981;Salters and Hart 1991;Horan et al 1998;M€ unker et al 2001;Kleine et al 2004Kleine et al , 2008.…”

Section: Iron Meteoritesmentioning

confidence: 99%

Tungsten isotopes in bulk meteorites and their inclusions—Implications for processing of presolar components in the solar protoplanetary disk

Holst

Paton

Wielandt

et al. 2015

Meteorit & Planetary Scien

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We present high precision, low-and high-resolution tungsten isotope measurements of iron meteorites Cape York (IIIAB), Rhine Villa (IIIE), Bendego (IC), and the IVB iron meteorites Tlacotepec, Skookum, and Weaver Mountains, as well as CI chondrite Ivuna, a CV3 chondrite refractory inclusion (CAI BE), and terrestrial standards. Our high precision tungsten isotope data show that the distribution of the rare p-process nuclide 180 W is homogeneous among chondrites, iron meteorites, and the refractory inclusion. One exception to this pattern is the IVB iron meteorite group, which displays variable excesses relative to the terrestrial standard, possibly related to decay of rare 184 Os. Such anomalies are not the result of analytical artifacts and cannot be caused by sampling of a protoplanetary disk characterized by p-process isotope heterogeneity. In contrast, we find that 183 W is variable due to a nucleosynthetic s-process deficit/r-process excess among chondrites and iron meteorites. This variability supports the widespread nucleosynthetic s/r-process heterogeneity in the protoplanetary disk inferred from other isotope systems and we show that W and Ni isotope variability is correlated. Correlated isotope heterogeneity for elements of distinct nucleosynthetic origin ( 183 W and 58 Ni) is best explained by thermal processing in the protoplanetary disk during which thermally labile carrier phases are unmixed by vaporization thereby imparting isotope anomalies on the residual processed reservoir.

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Section: Iron Meteoritesmentioning

confidence: 99%

Tungsten isotopes in bulk meteorites and their inclusions—Implications for processing of presolar components in the solar protoplanetary disk

Holst

Paton

Wielandt

et al. 2015

Meteorit & Planetary Scien

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“…Schindewolf and Irvine [27] absorbed Ge and Ga from diluted HF solutions on anion exchange resin AG1X8 while As(III) was not absorbed. Some more data about the behaviour of As(V) in HF media [28] and mixtures of HF/HNO 3 media [29] on AG1X8 are available although data for Ga differ in [27] and [28]. The behaviour of Ge, As(III) and As(V) in HCl media on AG1X8 is very well known from literature [30][31][32] and some data about the absorption in HCl/acetone media are available [33].…”

Section: Separationsmentioning

confidence: 99%

Separation and purification of no-carrier-added arsenic from bulk amounts of germanium for use in radiopharmaceutical labelling

et al. 2010

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72 As, 74 As, 77 As / Radioactive arsenic / Germanium target / Radiochemical separation / Labelled antibodies Summary. Radioarsenic labelled radiopharmaceuticals could add special features to molecular imaging with positron emission tomography (PET). For example the long physical half-lives of 72 As (T 1/2 = 26 h) and 74 As (T 1/2 = 17.8 d) in conjunction with their high positron branching rates of 88% and 29%, respectively, allow the investigation of slow physiological or metabolical processes, like the enrichment and biodistribution of monoclonal antibodies in tumour tissue or the characterization of stem cell trafficking. A method for separation and purification of no-carrier-added (nca) arsenic from irradiated metallic germanium targets based on distillation and anion exchange is developed. It finally converts the arsenic into an * As(III) synthon in PBS buffer and pH 7 suitable for labelling of proteins via As−S bond formations. The method delivers radioarsenic in high purity with separation factors of 10 6 from germanium and an overall yield from target to labelling synthon of > 40%. In a proof-ofprinciple experiment, the monoclonal antibody Bevacizumab, directed against the human VEGF receptor, was labelled with a radiochemical yield > 90% within 1 h at room temperature with nca 72/74/77 As.

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“…In order to obtain a large total efficiency for an experiment the separation factor between Group IV and V elements must be as high as possible while minimizing the volume of each fraction in order to facilitate the fast preparation of a counting sample. Based on reported data of distribution coefficients (K d ) [18,22] for the elements mentioned above in HF/HNO 3 media, the 11 M HF/7.7 M HNO 3 matrix was chosen to achieve the goal of separating the Group IV elements from a combined Nb and Ta fraction. Under these conditions the K d values of Nb and Ta are relatively small and close to each other, which allows them to be eluted together in a small fractional volume.…”

Section: Resultsmentioning

confidence: 99%

Procedures for Db chemical characterization in off-line experiments

Tereshatov

Gostic

Henderson

et al. 2012

J Radioanal Nucl Chem

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Element distribution coefficients for hydrofluoric acid/nitric acid solutions and the anion exchange resin Dowex 1X8

Abstract: This project was financially supported by Bundesministerium für Forschung und Technologie, Bonn. Irradiation facilities for the production of radionuclides were provided by Kernforschungszentrum Karlsruhe.

Cited by 39 publications

References 9 publications

Tungsten isotopes in bulk meteorites and their inclusions—Implications for processing of presolar components in the solar protoplanetary disk

Tungsten isotopes in bulk meteorites and their inclusions—Implications for processing of presolar components in the solar protoplanetary disk

Separation and purification of no-carrier-added arsenic from bulk amounts of germanium for use in radiopharmaceutical labelling

Procedures for Db chemical characterization in off-line experiments

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