Reference number : GC-2017-Q3-00568, amendment number : , agreement type : G, recipient legal name : Wallschläger, Dirk (Trent University), recipient country : CA, recipient province : nan, recipient city : Ontario, recipient postal code : nan, program name english : Engage Grants for universities, program name french : Subventions d'engagement partenarial pour les universités, program purpose english : Several different types of mining operations in Canada inadvertently mobilize selenium (Se) from the natural_x000D_
resources they're processing. In some cases, selenium may cause adverse effects on aquatic organisms, so_x000D_
mining operations affected by Se issues remove most of the mobilized Se from their process waters prior to_x000D_
discharge. However, as a result of historic emissions and/or current low level emissions, some receiving_x000D_
environments have elevated Se concentrations in their sediments. It is known that microbes in sediments may_x000D_
convert some of the deposited Se into more bioavailable organic forms ("species"), but it is unknown whether_x000D_
these organic Se species are released from the sediments back into the overlying waters, where they might then_x000D_
be available to organisms in the water column. We have recently developed analytical methods to measure_x000D_
discrete organic Se species in waters at the ng/L concentration level, and are now able to study such_x000D_
compounds in environmental waters._x000D_
If such organic Se species occur in mining-impacted aquatic systems, one primary open research question is_x000D_
their stability in these waters. In laboratory experiments, it has been shown previously that these organic Se_x000D_
species are susceptible to oxidation, e.g. by oxygen or UV-radiation, but there are to date no field data that_x000D_
quantify the rates of these degradation processes in actual receiving waters. In this project, we will collect_x000D_
water samples from several sites within a Se-impacted ecosystem, and follow the degradation of organic Se_x000D_
species (native or spiked) in these waters under controlled laboratory conditions over time. The goal of this_x000D_
project is to determine the degradation rates of discrete organic Se species in environmental waters, in order to_x000D_
assess for how long they might be available for bioaccumulation. As a useful side aspect, this study will also_x000D_
determine the short term stability of the studied organic Se species in these waters, to check if significant_x000D_
degradation occurs during transport from sampling site to analytical laboratory., program purpose french : Several different types of mining operations in Canada inadvertently mobilize selenium (Se) from the natural_x000D_
resources they're processing. In some cases, selenium may cause adverse effects on aquatic organisms, so_x000D_
mining operations affected by Se issues remove most of the mobilized Se from their process waters prior to_x000D_
discharge. However, as a result of historic emissions and/or current low level emissions, some receiving_x000D_
environments have elevated Se concentrations in their sediments. It is known that microbes in sediments may_x000D_
convert some of the deposited Se into more bioavailable organic forms ("species"), but it is unknown whether_x000D_
these organic Se species are released from the sediments back into the overlying waters, where they might then_x000D_
be available to organisms in the water column. We have recently developed analytical methods to measure_x000D_
discrete organic Se species in waters at the ng/L concentration level, and are now able to study such_x000D_
compounds in environmental waters._x000D_
If such organic Se species occur in mining-impacted aquatic systems, one primary open research question is_x000D_
their stability in these waters. In laboratory experiments, it has been shown previously that these organic Se_x000D_
species are susceptible to oxidation, e.g. by oxygen or UV-radiation, but there are to date no field data that_x000D_
quantify the rates of these degradation processes in actual receiving waters. In this project, we will collect_x000D_
water samples from several sites within a Se-impacted ecosystem, and follow the degradation of organic Se_x000D_
species (native or spiked) in these waters under controlled laboratory conditions over time. The goal of this_x000D_
project is to determine the degradation rates of discrete organic Se species in environmental waters, in order to_x000D_
assess for how long they might be available for bioaccumulation. As a useful side aspect, this study will also_x000D_
determine the short term stability of the studied organic Se species in these waters, to check if significant_x000D_
degradation occurs during transport from sampling site to analytical laboratory., agreement title english : Stability of organic selenium species in waters receiving industrial discharges, agreement title french : Stability of organic selenium species in waters receiving industrial discharges, agreement number : EGP, agreement value : 24819.0, agreement start date : 2017-11-08, agreement end date : nan, description english : nan, description french : nan, expected results english : nan, expected results french : nan, additional information english : Grant or Award spanning more than one fiscal year (2017-2018 to 2018-2019)., additional information french : Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier (2017-2018 à 2018-2019)., owner organization : nserc-crsng, owner organization title : Natural Sciences and Engineering Research Council of Canada | Conseil de recherches en sciences naturelles et en génie du Canada