ISOTOPIC FRACTIONATION OF SULFUR DURING FORMATION OF BASALUMINITE, ALUNITE, AND NATROALUNITE
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dc.contributor.author | Prietzel J. | |
dc.contributor.author | Mayer B. | |
dc.date.accessioned | 2023-12-23T04:12:14Z | |
dc.date.available | 2023-12-23T04:12:14Z | |
dc.date.issued | 2005 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=31247855 | |
dc.identifier.citation | Chemical Geology, 2005, 215, 1-4 SPEC. ISS., 525-535 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/42365 | |
dc.description.abstract | The extent of fractionation of sulfur (S) isotopes during precipitation of basaluminite and alunite in supersaturated Al2 (SO4)3 solutions was determined in a laboratory synthesis experiment. An acid 0.05 M Al2 (SO4)3 solution was partly neutralized with Ca(OH)2, NaOH, and KOH to a molar OH/Al ratio of 2.0. Subsequent aging of the precipitates for 15 weeks at temperatures of 20 and 50 °C resulted in the formation of poorly crystalline basaluminite [Al4(SO4)(OH)10· 4H2O], of mixtures of basaluminite with crystalline natroalunite [NaAl3(SO4)2 (OH)6] or alunite [KAl3(SO4)2 (OH)6], and of pure crystalline alunite. No significant isotopic fractionation of S was observed during the precipitation of poorly crystalline basaluminite (Δδ34 Sbasaluminite-solution=+0.04±0.34‰). In contrast, the formation of alunite and natroalunite was accompanied by small but significant isotopic fractionation that favored the incorporation of the heavier isotope, 34S, in the minerals. Sulfur-isotope fractionation (Δδ34 Smineral-solution) was +0.84±0.34‰ for alunite, and +1.72±0.34‰ for natroalunite. The extent of S-isotope fractionation was found to be dependent on (i) the chemical composition and (ii) the crystal structure of the synthesized minerals, and seems to be related to the physico-chemical properties of the involved ions (charge, radius, mass), the energy balance of the reaction, and the reaction rate. The results indicate that S-isotope mass balances in aerated acid soils are not significantly confounded by S isotopic fractionation effects associated with the formation of Al hydroxysulfates. © 2004 Elsevier B.V. All rights reserved. | |
dc.subject | ALUNITE | |
dc.subject | BASALUMINITE | |
dc.subject | NATROALUNITE | |
dc.subject | PRECIPITATION | |
dc.subject | S-ISOTOPE FRACTIONATION | |
dc.title | ISOTOPIC FRACTIONATION OF SULFUR DURING FORMATION OF BASALUMINITE, ALUNITE, AND NATROALUNITE | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.chemgeo.2004.06.048 |
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