报告题目：Flux and Fate of Silver Nanoparticles in Small Watersheds under Different Land Use（不同土地利用方式下小流域纳米银颗粒的通量和归趋）
报告人：法国巴黎地球物理研究所Marc F. BENEDETTI教授
According to recent estimates, it is expected that global production of functionalized nanoparticles will increase to 58,000 t/y in 2020. It is therefore inevitable that a significant proportion of manufactured nanoparticles will be disseminated in natural environments, and may eventually impact ecosystems. Several studies have calculated the theoretical fluxes of nanoparticles in the environment, revealing the existence of potentially problematic concentrations for several compartments. However, these scenarios are very difficult to confirm by field observations due to the difficulties of detecting these nano-objects and the complexity of natural environments.
The work presented here aims to highlight the use of original nanoparticle quantification techniques in Seine river’s sub-watersheds. In particular, the technique of sp-ICPMS (single particle counting by ICP-MS), applied to nano-Ag, allowed to detect and quantify their presence in waters draining three zones with contrasting soil occupations (urban, agricultural and forestry). The results obtained during sampling campaigns carried out over a year show nanoparticle number concentrations and a different size distribution for these three types of soil occupation. The information obtained allows us to refine our understanding of the contribution of these three major types of sources to nanoparticle flows in the Seine basin, based on watersheds that are very well characterized from a physico-chemical point of view.
Marc F. BENEDETTI教授：现任巴黎地球物理研究所（Institut de Physique du Globe de Paris，IPGP）副所长、巴黎第七大学前任副校长，法国国家科学研究院（CNRS）研究员，美国化学学会（ACS）、地球化学学会（GS）、美国地球物理联合会（AGU）会士。NICA-Donnan模型的创建者之一，Donnan膜技术（DMT）的早期研究者，在Nature、Environmental Science & Technology、Geochimica et Cosmochimica Acta、Water Research等著名期刊上发表论文近150篇。其主要研究方向：（1）生物地球化学大循环中土壤及水体中化学元素与胶体物质之间的相互作用，包括大量元素、重金属元素及放射性元素的形态分布、固液分配、迁移特征；（2）生物化学风化过程中土壤有机碳及无机元素的地球化学行为。