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Archiv-Übersicht     Angebot Nr. 13093

Angebotsdatum: 21. Oktober 2018
Art der Stelle: Doktorarbeit
Fachgebiet: Geowissenschaften > Sonstiges
Titel des Themas: The influence of sulfur on arsenic mobility in rice paddies

Institut: Umweltgeochemie
Prof. Britta Planer-Friedrich
Universitätsstrasse 30
95447 Bayreuth
Tel.: 0921 553999   Fax.:
Bundesland: Bayern
Homepage: http://www.umweltgeochemie.uni-bayreuth.de/umweltgeochemie/en/stellen/diss/detail.php?id_obj=147846
E-Mail Kontakt: mail

Beschreibung: Consumption of rice is a major route for human exposure to chronically toxic arsenic. Arsenic is mobile in rice paddies because rice cultivation under flooded conditions leads to reductive dissolution of iron hydroxides and release of previously sorbed arsenic. Alternate-wet-drying cycles have been proposed to decrease arsenic pore water concentrations. Sulfate fertilization has also recently been promoted with the additional benefit of decreasing methane release but shows contradictory effects on arsenic pore water levels. Despite decades of research, many open questions remain regarding the exact interplay between arsenic, iron, carbon, and sulfur cycles, especially considering that our group recently discovered a new group of arsenic-sulfur species (so-called thioarsenates) in rice paddies. Thioarsenates escape routine sampling and analysis methods even though they seem to represent a substantial fraction of total arsenic in rice paddies.
The present project will study sulfur cycle-driven abiotic and microbial arsenic mobilization in laboratory incubation experiments with different iron minerals, natural organic matter, and rice paddy samples. The PhD student will benefit from excellent laboratory facilities at Bayreuth University and by research cooperation at the Environmental Research Center Leipzig/Halle. We provide a creative and supportive environment to work on this challenging and environmentally highly relevant topic as well as the opportunity for field work abroad.

Our ideal candidate should have a strong background in Environmental Chemistry and Analytics, ideally with previous experience in mass spectrometry, and a strong interest in redox chemistry. Applicants must have the ability to work independently and in a team, have excellent management, communication and language (English) skills, and be highly motivated to pursue interdisciplinary research.

Start date should be no later than January 2019. Employment (TVL E13, 75%, 3-4 years) will be arranged by Bayreuth University. Candidates with disabilities will be preferred in case of equal qualification.

More information, including recent publications can be found on our website: http://www.umweltgeochemie.uni-bayreuth.de/. For more project-specific information and to apply, please send a CV, motivation letter and overview of techniques and methods used in the past by email to Prof. Dr. Britta Planer-Friedrich (b.planer-friedrich@uni-bayreuth.de).
Methoden: HPLC-UV, IC-ICP-MS
Anfangsdatum: 1. Januar 2019
Geschätzte Dauer: 3-4 Jahre
Bezahlung: 75% E13