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Toxicity of soil-dwelling organisms to nZVI

土壤生物对 nZVI 的毒性

基本信息

批准号：
537287-2018
负责人：
Hale, Beverley
金额：
$ 0.85万
依托单位：
University of Guelph
依托单位国家：
加拿大
项目类别：
Collaborative Research and Development Grants
财政年份：
2020
资助国家：
加拿大
起止时间：
2020-01-01 至 2021-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=699348
关键词：
Toxicity soil dwelling organisms nZVI

项目摘要

Nano zero-valent iron (nZVI) has great potential for remediation of soil contaminants, particularly organic compounds that are recalcitrant to microbial degradation or weathering. However, risk assessments of nZVI toxicity to soil dwelling organisms native to Canada have yet to be conducted; this knowledge is required to ensure that the remediation doesn't cause harm. Soil organisms such as earthworms, plants, and invertebrates may be exposed to nZVI as a result of remediation activities, and due to its small size, anaerobic bacteria in the soil may also be impacted significantly. Determining the toxicity thresholds for nZVI to soil dwelling organisms using protocols developed by Environment and Climate Change Canada (ECCC) would allow Canada to adopt the lead position in this field and allow for informed decisions to be made concerning regulations relevant to contaminated sites. Such sites are vast in number including active and legacy sites that are being managed by the company, as well as abandoned and orphaned sites. This is the first objective of the proposed work. The second objective of the proposed work is to express these toxicity thresholds as measured concentration of nZVI in soil rather than nominal, requiring the adaptation and validation of existing detection methods for aqueous systems.

纳米零价铁（nZVI）在修复土壤污染物，特别是有机污染物方面具有巨大的潜力对微生物降解或风化有抑制作用的化合物。然而，nZVI的风险评估对加拿大本土土壤生物的毒性尚未进行;需要了解这些知识，确保补救措施不会造成伤害。土壤生物，如蚯蚓、植物和无脊椎动物可能会暴露于nZVI作为补救活动的结果，并由于其规模小，厌氧细菌在土壤也可能受到严重影响。确定nZVI对土壤生境的毒性阈值使用加拿大环境和气候变化（ECCC）开发的协议，加拿大将在这一领域采取领导地位，并允许就下列问题作出知情决定：有关污染场地的规定。这样的站点数量巨大，包括活动站点和遗留站点，正在由该公司管理，以及废弃和孤儿网站。这是第一个目标，提议的工作。拟议工作的第二个目标是表达这些毒性阈值的测量土壤中的nZVI浓度，而不是标称浓度，需要调整和验证现有检测用于水系统的方法。