Impact of repeated manure applications on metal load and plant availability in Saskatchewan soils

Non-Peer Reviewe

Climate change considerations for metals sequestration in mine-impacted wetlands in northern Saskatchewan

Natural wetlands have demonstrated abilities for sequestering metals and, along with constructed wetlands, are becoming popular as a sustainable and passive form of water treatment at abandoned mine sites. The sequestration of metals, such as aluminum, iron, uranium, and radium-226 within natural wetlands has been observed at a series of abandoned uranium mines in northern Saskatchewan. These sites are being managed by the Saskatchewan Research Council (SRC) through risk assessment in support of permanent closure, however, during the risk assessment process, the longevity and sustainability of metals treatment within these wetlands under a changing climate is being considered. This paper will outline the sequestration pathways within a wetland which receives mine drainage water and discuss potential for the anticipated changes under future climate conditions. Field-based studies were conducted by Ensero Solutions Inc. (Ensero) to assess the mechanisms, stability, and longevity of metals attenuation within and along water features in the wetland. Using the results from these studies, this paper will discuss the observed metals sequestration extent within the wetland, along with the various removal mechanisms that were identified. It was observed that continued sequestration of these metals, particularly uranium and radium-226, is contingent on the continued availability of organic matter within the wetland for uranium uptake, however, it is expected that the production of organic matter is susceptible to decline in water levels within the wetland under anticipated climate change conditions. Options for maintaining the water supply to the wetlands are thereby being considered as an aspect of the closure approach.Non UBCUnreviewedOthe

The incidence and significance of anti-natalizumab antibodies - Results from AFFIRM and SENTINEL

Objective: To determine the incidence and clinical effects of antibodies that develop during treatment with natalizumab