Understanding the role of soil properties on the fate of trace elements in organic waste amended soils

Recycling of organic waste (OW) as fertilizer in agricultural soil is a widely used practice as it ensures sustainable development. Copper (Cu) and zinc (Zn) are major inorganic contaminants in organic wastes that accumulate at the surface and pose several risks (e.g. phytotoxicity). The environmental fate and risks posed by these metals depend on their chemical speciation. If we demonstrated that metal speciation is altered by OW type (raw OWs, digestates or composts), we still need to establish the role of soil properties (pH, mineralogy, organic matter, etc.) on the fate of Cu and Zn in OWs amended soils. We propose to investigate the impact of Cu and Zn borne OWs on amended soils from two long-term field experiments selected for their contrasted soil characteristics. Due to the trace level of metals, FAME Beamline in required and best suited for our XAS measurements.