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Beitrag von Dr. Daniel Pröfrock, Leiter der Abteilung Marine Bioanalytische Chemie

In der vorletzten Woche wurde die Veröffentlichung A fully automated simultaneous single stage separation of Sr, Pb and Nd using DGA resin for isotopic analysis of marine sediments, die Tristan Zimmermann als gleichberechtigter Erstautor zusammen mit Anika Retzmann von der Universität für Bodenkultur Wien (BOKU) veröffentlicht hat, durch das Kuratorium des Jubiläumsfonds der Stadt Wien für die Universität für Bodenkultur Wien mit dem BOKU Best Paper Award ausgezeichnet.

Tristan Zimmermann beendet gerade seine Doktorarbeit in der Abteilung „Marine Bioanalytische Chemie“ am Institut für Küstenforschung. Anika Retzmann fertigte 2015 ihre Masterarbeit in der Abteilung „Marine Bioanalytische Chemie“ an und schreibt ebenfalls gerade an ihrer Promotionsarbeit, die durch Prof. Dr. Ing. Thomas Prohaska von der Montanuniversität in Leoben betreut wird. Da Anika Retzmann gerade einen Forschungsaufenthalt an der University of Calgary in Kanada absolviert, nahm Tristan Zimmermann bei der Preisverleihung die Auszeichnung in Wien im Rahmen einer feierlichen Veranstaltung stellvertretend für beide Erstautoren in Empfang.

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Retzmann, A., Zimmermann, T., Pröfrock, D., Prohaska, T., & Irrgeher, J. (2017): A fully automated simultaneous single-stage separation of Sr, Pb, and Nd using DGA Resin for the isotopic analysis of marine sediments. Analytical and Bioanalytical Chemistry, September 2017, Volume 409, Issue 23, pp 5463–5480, doi:10.1007/s00216-017-0468-6

Abstract:

A novel, fast and reliable sample preparation procedure for the simultaneous separation of Sr, Pb, and Nd has been developed for subsequent isotope ratio analysis of sediment digests. The method applying a fully automated, low-pressure chromatographic system separates all three analytes in a single-stage extraction step using self-packed columns filled with DGA Resin. The fully automated set-up allows the unattended processing of three isotopic systems from one sediment digest every 2 h, offering high sample throughput of up to 12 samples per day and reducing substantially laboratory manpower as compared to conventional manual methods. The developed separation method was validated using the marine sediment GBW-07313 as matrix-matched certified reference material and combines quantitative recoveries (>90% for Sr, >93% for Pb, and >91% for Nd) with low procedural blank levels following the sample separation (0.07 μg L⁻¹ Sr, 0.03 μg L⁻¹ Pb, and 0.57 μg L⁻¹ Nd). The average δ values for Sr, Pb, and Nd of the separated reference standards were within the certified ranges (δ (⁸⁷Sr/⁸⁶Sr)_{NIST SRM 987} of −0.05(28) ‰, δ(²⁰⁸Pb/²⁰⁶Pb)_{NIST SRM 981} of −0.21(14) ‰, and δ(¹⁴³Nd/¹⁴⁴Nd)_JNdi-1 of 0.00(7) ‰). The DGA Resin proved to be reusable for the separation of >10 sediment digests with no significant carry-over or memory effects, as well as no significant on-column fractionation of Sr, Pb, and Nd isotope ratios. Additional spike experiments of NIST SRM 987 with Pb, NIST SRM 981 with Sr, and JNdi-1 with Ce revealed no significant impact on the measured isotopic ratios, caused by potential small analyte peak overlaps during the separation of Sr and Pb, as well as Ce and Nd.