Abstract
A new, simple and fast separation method for Fe using an extraction chromatographic resin, Aliquat 336 (commercially available as TEVA resin) has been developed. A one milliliter column containing 0.33 mL TEVA resin on 0.67 mL CG-71C was used.Iron was adsorbed with 6mol·L-1 HCl + H2O2 on TEVA resin, and recovered with 2 mol·L-1HNO3. The recovery yield and total blank were 93.5 ± 6.5% and 6 ng, respectively. Theseparation method is simple, and takes < 2 hours. For evaluation of the Fe separation, Fe isotope ratios were measured by a double-spike method employing multicollector inductively coupled plasma source mass spectrometry (MC-ICP-MS) with repeatability of 0.06‰ (SD) for the standard solution and ~0.05‰ for the silicate samples. Therefore, the column chemistry developed in this study is a viable option for Fe isotope ratio measurement by MC-ICP-MS.
Highlights
Trioctylmethylammonium chloride (Aliquat 336) works as an anion exchanger, and is used in extraction chromatography [1]
They used the advantage of acid resistance of the TEVA resin [5], namely, HNO3 was used in the final step to recover Zn that was strongly adsorbed on the resin
Fe isotope ratios were measured using a double spike method [8,9,10,11] at high mass resolution by MC-ICP-MS to show the validity of the method
Summary
Trioctylmethylammonium chloride (Aliquat 336) works as an anion exchanger, and is used in extraction chromatography (commercially sold as TEVA resin) [1]. Makishima and Nakamura [4] successfully purified Zn using a one milliliter column composed of 0.33 mL TEVA resin on 0.67 mL CG-71C resin They used the advantage of acid resistance of the TEVA resin [5], namely, HNO3 was used in the final step to recover Zn that was strongly adsorbed on the resin. Based on this novel finding, it was noticed that the anionic character of the TEVA resin could be applied to separation of Fe. This study applies the TEVA resin for purification of Fe for isotope ratio measurements using multicollector (MC)-ICP-MS for the first time. Fe isotope ratios were measured using a double spike method [8,9,10,11] at high mass resolution by MC-ICP-MS to show the validity of the method
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