Description: Das Projekt "Immobilisation of arsenic in paddy soil by iron(II)-oxidizing bacteria" wird vom Umweltbundesamt gefördert und von Universität Tübingen, Institut für Geowissenschaften, Zentrum für Angewandte Geowissenschaften durchgeführt. Arsenic-contaminated ground- and drinking water is a global environmental problem with about 1-2Prozent of the world's population being affected. The upper drinking water limit for arsenic (10 Micro g/l) recommended by the WHO is often exceeded, even in industrial nations in Europe and the USA. Chronic intake of arsenic causes severe health problems like skin diseases (e.g. blackfoot disease) and cancer. In addition to drinking water, seafood and rice are the main reservoirs for arsenic uptake. Arsenic is oftentimes of geogenic origin and in the environment it is mainly bound to iron(III) minerals. Iron(III)-reducing bacteria are able to dissolve these iron minerals and therefore release the arsenic to the environment. In turn, iron(II)-oxidizing bacteria have the potential to co-precipitate or sorb arsenic during iron(II)- oxidation at neutral pH followed by iron(III) mineral precipitation. This process may reduce arsenic concentrations in the environment drastically, lowering the potential risk for humans dramatically.The main goal of this study therefore is to quantify, identify and isolate anaerobic and aerobic Fe(II)-oxidizing microorganisms in arsenic-containing paddy soil. The co-precipitation and thus removal of arsenic by iron mineral producing bacteria will be determined in batch and microcosm experiments. Finally the influence of rhizosphere redox status on microbial Fe oxidation and arsenic uptake into rice plants will be evaluated in microcosm experiments. The long-term goal of this research is to better understand arsenic-co-precipitation and thus arsenic-immobilization by iron(II)-oxidizing bacteria in rice paddy soil. Potentially these results can lead to an improvement of living conditions in affected countries, e.g. in China or Bangladesh.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Tübingen ? Reis ? Eberesche ? Eisen ? USA ? Aerobe Bedingungen ? Anaerobe Bedingungen ? Arsen ? Bodenbakterien ? Eisenbakterien ? Schadstoffbelastung ? Blei ? China ? Main ? Bodenkunde ? Bodenmikroorganismen ? Regenwasser ? Rhizosphäre ? Bakterien ? Hautkrebs ? Bangladesch ? Haut ? Weltbevölkerung ? Getränk ? Krebserkrankung ? Oxidation ? Studie ? Trinkwasser ? Wasserspeicher ? Mikroorganismen ? Sediment ? Wasser ? Boden ? Meeresfrüchte ? Bewässerung ? Europa ? Gefährdungspotenzial ? Erdoberfläche ? Forschung ? Gesundheit ? Krankheit ? Mineral ? Niederschlag ? Umwelt ? ENTFERNUNG ? Konzentrat ? LAND ? LEBENSBEDINGUNG ? VERARBEITEN ? DEMOBILISIERUNG ? DAUER ? POTENZIAL ? ERGEBNIS ? LAENDER ? Bepflanzung ? EXPERIMENT ? INDUSTRIELL ? KONTAMINIEREN ? PRAEZIPITATION ? UMWELTPROBLEM ?
Region: Baden-Württemberg
Bounding box: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2009-01-01 - 2024-11-29
Accessed 1 times.