Continuous flow analysis of labile iron in ice-cores
| Autor: | Hubertus Fischer, W. T. Hiscock, Olivia Mini, Gideon Gfeller, Matthias Bigler, Daiana Leuenberger |
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| Rok vydání: | 2013 |
| Předmět: |
Hydrology
010504 meteorology & atmospheric sciences Iron Greenland Ice Mineralogy Flux Antarctic Regions General Chemistry 010501 environmental sciences Particulates Mineral dust 01 natural sciences Carbon cycle Aerosol Deposition (aerosol physics) Ice core 13. Climate action Interglacial Environmental Chemistry 14. Life underwater Geology 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science & Technology |
| ISSN: | 1520-5851 |
| Popis: | The important active and passive role of mineral dust aerosol in the climate and the global carbon cycle over the last glacial/interglacial cycles has been recognized. However, little data on the most important aeolian dust-derived biological micronutrient, iron (Fe), has so far been available from ice-cores from Greenland or Antarctica. Furthermore, Fe deposition reconstructions derived from the palaeoproxies particulate dust and calcium differ significantly from the Fe flux data available. The ability to measure high temporal resolution Fe data in polar ice-cores is crucial for the study of the timing and magnitude of relationships between geochemical events and biological responses in the open ocean. This work adapts an existing flow injection analysis (FIA) methodology for low-level trace Fe determinations with an existing glaciochemical analysis system, continuous flow analysis (CFA) of ice-cores. Fe-induced oxidation of N,N′-dimethyl-p-pheylenediamine (DPD) is used to quantify the biologically more important and easily leachable Fe fraction released in a controlled digestion step at pH ∼1.0. The developed method was successfully applied to the determination of labile Fe in ice-core samples collected from the Antarctic Byrd ice-core and the Greenland Ice-Core Project (GRIP) ice-core. |
| Databáze: | OpenAIRE |
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