Separation of Uranium by Reversed-Phase Partition Chromatography on a Kel-F Column

Hamlin, A. G.; Roberts, Beverley; Loughlin, W.; Walker, Simon

doi:10.1021/ac60179a027

Cited by 79 publications

(10 citation statements)

References 8 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The U-Pb samples were dissolved in teflon-lined steel autoclaves, as described by Krogh [1973], and separated from 2-ml Bio-Rad 1X8, 100-200 mesh resin columns, using HBr, HC1, and H,•O as eluants. The uranium was further purified, following the tri-n-butyl phosphate coated teflon powder method of Hamlin et al [1961] and then mass spectrometrically determined by the triple Re filament technique as described by the National Bureau of Standards group led by Shields [1966]. The lead samples were purified by an anodic electrodeposition method, and the loading and analysis method closely follows that outlined by Barnes et al [1973].…”

Section: Sample Collection and Experimental Proceduresmentioning

confidence: 99%

Geochronology of the deep profile through archean basement at Vredefort, with implications for early crustal evolution

Hart¹,

Welke²,

Nicolaysen³

1981

J. Geophys. Res.

View full text Add to dashboard Cite

The presence of Archean granite forming the core of an updomed and overturned sequence of strata at Vredefort, South Africa, has been known for over 70 years. Recent geophysical, geochemical, and geological evidence has given rise to the proposal that the basement granite core has also been overturned, presenting a section of the earth's granitic crust to view and that radial traverses in the Vredefort basement penetrate through a ∼15 km thick section of the Archean crust, when moving from the contact of collar strata to the center of the dome. The upper levels of the Vredefort crust are dominated by a relatively homogeneous outer granite gneiss (OGG) displaying marked gradients in large ion lithophile elements. These rocks grade inward into the deeper levels which occur in granulite facies metamorphism. The deeper levels of the Vredefort crust exposed in the central parts of the dome consist predominantly of felsic Inlandsee Leucogranofels (ILG) which occurs interleaved with inclusions of mafic metavolcanic and metasedimentary rocks termed Steynskraal Metamorphic Zone (SMZ). A comprehensive isotopic study using four decay schemes (87Rb, 232Th, 238U, and 235U) on this crustal section is now reported. The results permit unique and direct tests on the theories of Archean crust forming processes. In the upper Vredefort crust, whole rock isochron ages of ∼3050 m.y. are obtained from the four decay schemes, and almost all evidence of an extended crustal history prior to ∼3050 m.y. has been obliterated. Establishment of strong vertical gradients in Rb/Sr ratio, shortly before ‘setting’ of Rb‐Sr whole rock systems, has wide implications for the interpretation of Sr initial ratios. Although the Vredefort upper levels of the crust has a low 87Sr/86Sr initial ratio of 0.7019 ± 0.0002, it probably participated in a crustal prehistory for at least 500 m.y. In the deeper levels of the Vredefort basement the geochronology is much more complex. Rb‐Sr and Th‐Pb isochrons of ∼3500 m.y. are recorded in the mafic granulite relicts. A companion paper (Welke and Nicolaysen, this issue) provides evidence for an early crust‐forming event in this sector ∼3800 m.y. ago. From ∼3500 m.y. onward, these deeper crustal levels did not undergo addition of new Archean crust‐forming material on a major scale. Nevertheless, a most important younger Archean event affected these levels ∼2800 m.y. ago: cessation of high‐grade metamorphism is recorded by setting of the Rb‐Sr isotopic system in the felsic rocks and zircon U‐Pb ages; an episode of strong uranium depletion affected both the felsic and mafic rocks of this sector ∼2800 m.y. ago. The Inlandsee Leucogranofels is evidently a rock unit with a long and complex history, beginning with the emplacement as a crustal unit at least 3800 m.y. ago. Since then it has been subject to reworking and resetting of isotopic systems which terminated ∼2800 m.y. ago. In the deeper crust there is scant evidence of a 3050 m.y. event. Similarly, there is no record of a ∼2800 m.y. old imprint in the upper Vredefort ...

show abstract

Section: Sample Collection and Experimental Proceduresmentioning

confidence: 99%

Geochronology of the deep profile through archean basement at Vredefort, with implications for early crustal evolution

Hart¹,

Welke²,

Nicolaysen³

1981

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…The experimental results were compared with packings used by other authors, and it was concluded that the TBP-loaded perlite column shows approximately the same selectivity and rapidity (16)(17)(18)(19)(20)(21).…”

Section: Resultsmentioning

confidence: 98%

Preparation of a Chromatographic Solid Support on the Basis of Perlite, and Separation of Uranium on a Tributyl-Phosphate-Loaded Perlite Column

Akçay¹,

Kılınç²,

Karakaş³

1998

Separation Science and Technology

View full text Add to dashboard Cite

The S1O2 content of the mineral perlite, which is the 70-75% range, was converted to soluble silicates with NaOH. The acidification of soluble silicates in the perlite formed hydrogels which turned into xerogels upon drying. Several parameters, particle size, specific surface area, pore size and volume, and surface hydroxyl group density were investigated for perlite standardized by NaOH. The standardized perlite was silanized and loaded with 20% (w/w) tributyl phosphate before use as a reversedphase column chromatograghy solid support for the investigation of the chromatographic behavior of UO| + and Fe 3+ .

show abstract

“…The flask was washed with one milliliter of nitrobenzene, which was then poured Ikuko AKAZA [Vol. 39,No. 3 on the Kel-F powder, all of the excessive solvent being drained through the filter.…”

Section: Resultsmentioning

confidence: 99%

“…Some of them could not retain nitrobenzene containing poly-iodide, while others were affected by the solvent system. However, the Kel-F (polytrifluorochloroethylene) moulding powder recommended by Hamlin et al 3) was found to be very suitable because of its large absorptivity and capacity for the solvent and its strong resistivity against chemical agents. Therefore, this substance was finally chosen for this investigation.…”

mentioning

confidence: 99%

The Separation of Alkali Metals as Poly-Iodides by Reversed-Phase Partition Chromatography

Akaza¹

1966

Bulletin of the Chemical Society of Japan

View full text Add to dashboard Cite

The liquid-liquid extraction of alkali metal ions as their poly-iodides had previously been investigated by the present author. In order to attain a good separation of each metal, this extraction system has now been extended to a reversed-phase partition chromatography in which Kel-F powder was used to support the organic phase of nitrobenzene-iodine-iodide. Column chromatographic separation was carried out in the presence of relatively large amounts of the metals by elution with water and 1 n or 6 n hydrochloric acid - eluting solutions. Chromatographic behavior of each metal ion was investigated and the elution from the column was found to be in the order of Li-Na-K-Rb-Cs. The distribution ratio of the metal ions varied with the quantity of the ions loaded on the column; the smaller the quantity of the ions used, the larger was the distribution ratio obtained. The actual separation of individual metal ions from the mixture was successfully achieved; a minute amount of cesium could be particularly isolated from large amounts of other alkali metals, even in a large volume of the sample solution. Elution curves of various amounts of metal were obtained as an aid to a discussion of the partition on the column. A comparison of the distribution ratio in the liquid-liquid extraction with that in the column chromatography showed that the extraction of the same mechanism proceeded in both cases.

show abstract

Separation of Uranium by Reversed-Phase Partition Chromatography on a Kel-F Column

Cited by 79 publications

References 8 publications

Geochronology of the deep profile through archean basement at Vredefort, with implications for early crustal evolution

Geochronology of the deep profile through archean basement at Vredefort, with implications for early crustal evolution

Preparation of a Chromatographic Solid Support on the Basis of Perlite, and Separation of Uranium on a Tributyl-Phosphate-Loaded Perlite Column

The Separation of Alkali Metals as Poly-Iodides by Reversed-Phase Partition Chromatography

Contact Info

Product

Resources

About