Separation of hafnium from zirconium by anion exchange

Hague, J.L.; Machlan, L. A.

doi:10.6028/jres.065a.008

Cited by 24 publications

(4 citation statements)

References 9 publications

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“…For some rock matrices, such leaching decreases Hf yields dramatically (Hf is coprecipitated with Ca‐Mg fluorides), but leaching can be replaced by an additional cation column step [ Blichert‐Toft , 2001]. Efficient Ti‐Zr‐Hf separation was achieved using H 2 SO 4 [ Barovich et al , 1995; Scherer et al , 1995], in which distribution coefficients between Ti‐Zr‐Hf differ significantly [ Danielson , 1965; Hague and Machlan , 1961; Strelow and Bothma , 1967]. In principle, chemical separations for MC‐ICPMS can be simplified over previous methods because the high ionization efficiency of the plasma source (1) allows smaller samples to be run and (2) eliminates the need for efficient Zr‐Hf separation.…”

Section: Previous Separation Techniquesmentioning

confidence: 99%

Separation of high field strength elements (Nb, Ta, Zr, Hf) and Lu from rock samples for MC‐ICPMS measurements

Münker

Weyer

Scherer

et al. 2001

Geochem Geophys Geosyst

455

248

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[1] Abstract: The application of multiple collector inductively coupled plasma source mass spectrometry (MC-ICPMS) to 176 Hf and 92 Zr chronometry has been hampered by complex Zr-Hf purification procedures that involve multiple ion exchange column steps. This study presents a single-column separation procedure for purification of Hf and Lu by ion exchange using Eichrom 1 LnSpec resin. The sample is loaded in pure HCl, and element yields are not dependent on the sample matrix. For 92 Zr chronometry, a one-column procedure for purification of Zr using Biorad 1 AG-1-Â 8 resin is described. Titanium and Mo are completely removed from the Zr, thus enabling accurate 92 Zr measurements. Zirconium and Nb are quantitatively separated from rock samples using Eichrom Ln-Spec resin, allowing measurements of Zr/Nb with a precision of better than ±5% (2s). The Ln-Spec and anion resin procedures may be combined into a three-column method for separation of Zr-Nb, Hf, Ta, and Lu from rock samples. For the first time, this procedure permits combined isotope dilution measurements of Nb/Ta, Zr/Hf, and Lu/Hf using a mixed 94 Zr-176 Lu-180 Hf-180 Ta tracer. Analytical protocols for Zr and Hf isotope measurements using the Micromass Isoprobe, a second generation, single-focusing MC-ICPMS, are reported. Using the Isoprobe at Münster, 2s external precisions of ±0.5e units for Hf and Zr isotope measurements are achieved using as little as 5 ng (Hf ) to 10 ng (Zr) of the element. The 176 Hf/ 177 Hf and Lu/Hf for rock reference materials agree well with other published MC-ICPMS and thermal ionization mass spectrometry (TIMS) data.

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Section: Previous Separation Techniquesmentioning

confidence: 99%

Separation of high field strength elements (Nb, Ta, Zr, Hf) and Lu from rock samples for MC‐ICPMS measurements

Münker

Weyer

Scherer

et al. 2001

Geochem Geophys Geosyst

455

248

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“…It has been shown previously [ 1 ] that hafnium can be separated from zirconium using 3.5 percent sulfuric acid solution to elute from resin having 8 percent of divinylbenzene crosslinkages having a maximum particle-sizing of about 50 μ (passing through a 270-mesh sieve). To obtain more separation the height of the resin column was increased to 22 cm.…”

Section: Elution Of Elements With Sulfuric Acid Solutionsmentioning

confidence: 99%

“…The difficulties encountered in separating hafnium from zirconium are well known [ 6 , 7 ]. 1 It has been shown [ 1 ] that a separation of hafnium and zirconium can be obtained by an ion-exchange in sulfuric acid solution.…”

Section: Introductionmentioning

confidence: 99%

Separation of hafnium from zirconium and their determination: separation by anion-exchange

Machlan¹,

Hague²

1962

J. RES. NATL. BUR. STAN. SECT. A.

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( A II gu~~ 2, I !)G2) A proced ure is d esc ribed f or Lhc s('pam !i o ll of h afnium f rom zi l'col lium a nd Lhcir individua l dete rminati on . Th e sample i s di ssol vC'd in sulfnri c a nd h ydro flu ori c aci d s a nd the b y drofj uoric ac id 1'('moved by fumin g. After dilrl! iOIl ,,"ith Imter t he solu t ion i s tra nsferred to a. CO ILU11 n contain i ng a, stro ng quaternary a m i ne a nion-exc h~l l~ge r esin (D owex-l ). Th e b af l1lull1 I S c lu ted With dllutcd (3. 5 pc'rccnt b y volum e) sulfuri c ac id solution. :tircon iull1 is r emoved b y e lu~i on w i th 10 pcrce n t by v ol um e sulfuri c ac id solu t i on. Th e elem ents a rC' prec ipi tated lVi~h e upfcrron , ig ni ted ,. a nd weig hed as Lhe oxides. FOI' sa mples con taining from twe n~.v Lo eighty p erc en t of ZIl'CO II I Ulll , a seco lld sC'p araLioll of t he h afnium fra ct ioll Ll si ng Lhe co lum n i s necessa r y.

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“…The ion exchange method was adapted from Wolszon, Hayes, and Hill [11] for the separation of boron and silicon. Using an anion exchange column, the boron and silicon, as the borate and silicate ions in a carbonate solution, were absorbed while the lithium and aluminum passes through the column.…”

Section: Instrument Roommentioning

confidence: 99%

Analytical mass spectrometry section:

Shields¹

1967

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Separation of hafnium from zirconium by anion exchange

Cited by 24 publications

References 9 publications

Separation of high field strength elements (Nb, Ta, Zr, Hf) and Lu from rock samples for MC‐ICPMS measurements

Separation of high field strength elements (Nb, Ta, Zr, Hf) and Lu from rock samples for MC‐ICPMS measurements

Separation of hafnium from zirconium and their determination: separation by anion-exchange

Analytical mass spectrometry section:

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