Hydrogeochemische Speziierung von Arsen, Gold und Kupfer in Eisen-Sulfid-Systemen unter Berücksichtigung abiotischer und mikrobiell katalysierter Wechselwirkungen

考虑非生物和微生物催化相互作用的硫化铁系统中砷、金和铜的水文地球化学形态

基本信息

批准号：
59860119
负责人：
Professorin Dr. Britta Planer-Friedrich
金额：
--
依托单位：
Lehrstuhl für Umweltgeochemie
依托单位国家：
德国
项目类别：
Independent Junior Research Groups
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/59860119?language=en
关键词：
Hydrogeochemische Speziierung von Arsen Gold

项目摘要

Complexation of arsenic and sulfur has a significant - and so far seldom considered - impact on inorganic arsenic chemistry in suboxic aquatic environments, such as precipitation of amorphous arsenic-sulfur phases during acidic sample preservation, erroneous species identification during hydride generation, and changes in mobility, redox behavior, and toxicity. The proposed project will start by improving preservation and analytical techniques (IC-ICPMS) for (thio)arsenic species in ferrous-sulfidic systems which have a worldwide importance since they host various economically interesting ore bodies and drinking water aquifers. Laboratory batch and column experiments will show the effect of thioarsenate solution and surface complexation on arsenic sorption to and remobilisation from iron(hydr)oxides and iron-sulfides in the absence and presence of gold and copper. Field studies will include ore formation processes within active geothermal systems, natural weathering processes at mine sites, and redox processes within reactive iron barriers. A special focus of the project is the determination of importance and rate of microbially catalyzed versus abiotic species transformations of thioarsenates in laboratory growth experiments and under natural conditions including characterization of the respective microbial communities.

砷和硫的络合物对亚氧化的水生环境中的无机砷化学具有显着的（迄今为止很少考虑）的影响，例如在酸性样品保存过程中的无形砷硫磺阶段的沉淀，在液化物产生过程中及移动性，氧化还原行为和毒性的变化，氢化物质鉴定过程中的错误物种鉴定。拟议的项目将首先改善（硫硫代）砷物种的保护和分析技术（IC-ICPMS），因为它们拥有各种经济上有趣的矿体和饮用水含水层，它们具有全球重要性。实验室批处理和柱实验将显示硫代砷酸盐溶液和表面络合对在不存在和存在金铜的情况下对铁（Hyd）氧化物和铁硫化物的砷吸附的影响。现场研究将包括主动地热系统中的矿石形成过程，矿场的自然风化过程以及反应性铁屏障中的氧化还原过程。该项目的一个特别重点是确定实验室生长实验和自然条件下的微生物催化与非生物物种转化的重要性和速率，包括对各个微生物群落的表征。