Separation of rare earth elements and strontium from chondritic meteorites by miniaturized extraction chromatography for elemental and isotopic analyses.

Abstract

A new separation scheme for rare earth elements (REE) and strontium, and its application to REE determination of chondrites and terrestrial rocks along with isotopic analysis of strontium in chondritic meteorites are presented. The miniaturized extraction chromatography scheme using RE and Sr Resins provide simple and effective methods for the isolation of REE and strontium from chondritic meteorites. Chemical yields of up to 90% of the desired elements and low procedural blanks enable us to use the resins for small-size chondritic meteorite samples, weighing one to five milligrams. The techniques presented here are fully applicable to Rb-Sr isotopic systematics and to REE geochemistry and cosmochemistry. A separation procedure of lead from total rock basalt samples using Sr Resin is also briefly described.

A rapid single column separation scheme for high-precision Sr–Nd–Pb isotopic analysis in geological samples using thermal ionization mass spectrometry

“…18,19 Previous results of the determination of distribution coefficients clearly show that Pb is easily bound directly to the Sr Spec resin in the HNO 3 media. In addition, it is noteworthy that Pb is retained even stronger than Sr on the Sr Spec resin.…”

“…[1][2][3][4] Thermal ionization source mass spectrometry (TIMS) is regarded as a benchmark analytical technique and is widely used in Earth Sciences because of its high accuracy, excellent sensitivity, and low memory. 18,19 The discarded material from the rst column is then dried and re-dissolved using HCl or HNO 3 . Traditionally, for the Sr, Nd and Pb isotope analyses using TIMS, tedious column chemistry includes many evaporation and complex operation steps.…”

Development of a fully automated open-column chemical-separation system—COLUMNSPIDER—and its application to Sr-Nd-Pb isotope analyses of igneous rock samples

“…Recently, crown -ether -based resins specifically designed for Sr separation (Sr -spec. resin) (Horwitz et al, 1992) have been used widely (Pin and Bassin, 1992;Misawa et al, 2000;Ishizuka et al, 2003;Balcaen et al, 2005;Ohno and Hirata, 2007;Míková and Denková, 2007;Shibata et al 2007;Makishima et al, 2008;Takahashi et al, 2009). In the case of Nd separation, NH 4 + -form cation exchange with 2 -hydroxyisobutyric acid (HIBA) (Kagami et al, 1987;Walker et al, 1989;Makishima and Nakamura 1991;Shibata and Yoshikawa, 2004;Shibata et al, 2007;Hirahara et al, 2009) or extraction resin with bis -(2 -ethylhexyl) hydrogen phosphate (HDEHP) (Richard et al, 1976) are used after removing major elements by H + -form cation -exchange chromatography.…”

Optimization techniques for improving the precision of isotopic analysis by thermal ionization mass spectrometry, taking strontium, neodymium, lead, and osmium as examples

“…For example, Koornneef (2013) [16] used single Re-filament for Sr and double Re-filament for Nd to do their analyses by 10 12 ohm current amplifiers. Misawa et al (2000), [17] Charlier et al (2006), [18] Font et al (2012), [19] and Caro et al (2006) [2] used single W-filament, single Re-filament, and double Re-filament for Sr or Nd measurements using 10 11 ohm resistors, respectively. Nevertheless, no experiment shows the discrepancy from different filament materials at same running conditions.…”