Arsenic uptake and specification in forage plants of contaminated sites on the example of the mining-affected floodplains of Ogosta river, Bulgaria

以保加利亚奥戈斯塔河受采矿影响的洪泛区为例，受污染地点饲料厂的砷吸收和规格

• 批准号: 221913004
• 负责人: Dr. Elke Süß
• 金额: --
• 依托单位: Bereich für Analytische Chemie
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/221913004?language=en
• 关键词: Arsenic; uptake; specification; forage; plants

Arsenic (As) is an ubiquitous, toxic contaminant, with known impact and high contamination levels in mining affected areas. Overall, As mobility and bioavailability is critically influenced by its speciation in the contaminated solids and soil waters, since different As species differ in their availability for plant uptake, translocation, detoxification and accumulation in biotic tissues. The transfer into plants, especially crops and forage plants enables As to enter the human and animal food chain, pursuing its toxic fate. However, many highly contaminated sites are still used for agriculture which particularly requires detailed investigations on the uptake and transfer of arsenic into forage plants on-site. Within the proposed postdoctoral research project field studies at a mining affected site (Ogosta River area, Bulgaria) and laboratory experiments will be combined to better characterize and understand the species depending As uptake on contaminated sites on selected non-hyperaccumulating forage plants. The possible occurrence and pathway of thioarsenic species, far reaching unstudied regarding their behaviour in the soil-plant system, is of interest for the studies to expand the current geochemical knowledge for these species. In a complex approach, species information found in the growing media (Ogosta soils, pore waters, hydroponic cultures) will be combined and related with the As speciation (inorganic As, As-phytochelatine complexes and plant thiol compounds) in the plant parts to examine the species dependent As uptake and translocation pathways. To address these issues a novel analytical approach will be used by combining plant As species and (As-)phytochelatin complexes by reversphase HPLC-ICP-MS/ESI-MS with spatial elemental distribution information by synchrotron-based µXRF/µXAS techniques with speciation and bioavailability information from the growing media (IC-ICP-MS/HPLC-ICP-MS and XAS).

砷（As）是一种普遍存在的有毒污染物，在受采矿影响的地区具有已知的影响和高污染水平。总的来说，砷的流动性和生物利用度受到其在污染固体和土壤水中的物种形成的严重影响，因为不同的砷物种在植物吸收、转运、解毒和生物组织积累方面的可用性不同。转移到植物，特别是作物和饲料植物，使砷进入人类和动物的食物链，追求其有毒的命运。然而，许多高度污染的场地仍然用于农业，这特别需要对砷的吸收和转移进行详细的调查。在拟议的博士后研究项目内，将把在受采矿影响地点（保加利亚奥戈斯塔河地区）进行的实地研究和实验室实验结合起来，以便更好地描述和了解取决于受污染地点对选定的非超积累饲料植物的吸收的物种。硫砷在土壤-植物系统中的行为尚未得到深入研究，但其可能的存在和途径对扩大现有硫砷地球化学知识的研究具有重要意义。在一个复杂的方法中，在生长介质（Ogosta土壤，孔隙水，水培培养物）中发现的物种信息将与植物部分的As物种形成（无机As， As-植物螯合酸复合物和植物硫醇化合物）相结合并相关联，以检查物种依赖的As吸收和转运途径。为了解决这些问题，将采用一种新的分析方法，通过反相HPLC-ICP-MS/ESI-MS结合植物As物种和（As-）植物螯合素复合物的空间元素分布信息，通过基于同步加速器的µXRF/µXAS技术结合生长介质的物种形成和生物利用度信息（IC-ICP-MS/HPLC-ICP-MS和XAS）。