Effect of four rare earth element lanthanides in boreal forest soil on invertebrates and soil microbial community
There is a need to estimate effect thresholds for the lanthanides, and in particular, using natural soils relevant to Canada. Prior research to address these data gaps specific to soil media have included the evaluation of cerium and lanthanum in forest soils, and the effect of aging and leaching on toxicity over time (EC, 2014). The study demonstrated low risk of these metals to the plant species assessed, but did demonstrate increased sensitivity to the soil invertebrate species, which then decreased with aging of the soil for ten months (EC, 2014). This study proposal aims to widen the applicability of soil toxicity assays to other priority metals, where such data is lacking.
The project objectives are:
• To provide soil effects data for four (4) lanthanide REEs: Praseodymium (Pr); Samarium (Sm); Terbium (Tb); and Erbium (Er). Specifically, effects data will be derived using a natural boreal forest and test organisms (soil invertebrates and indigenous microorganisms) representative of Canadian boreal ecozones; and
• To provide soil effects data for the impact of aging on two toxic lanthanide rare earthworm elements
• To develop a Species Sensitivity Distribution (SSD) based on the point estimate results generated for each rare earth element
The lanthanides can be divided into two groups: the ‘light’ lanthanides (e.g., Pr, Nd, Pm and Sm) and ‘heavy’ lanthanides (e.g., Tb, Dy and Er). It has been hypothesized that the heavy lanthanides will be more toxic, however, given the limited data available, no trend has been identified with certainty (Gonzalez et al., 2014). Also, given that REES are readily bound to soil (Sheppard et al., 2009), the bioavailability may be low resulting in reduced toxicity. As a result, the effects of the lanthanide REEs on the proposed test organisms and soil microbial communities will be evaluated to determine whether these proposed trends exist across the metals and species studied.
Basic view
Metadata Record Information
- File Identifier
- 095a8ed5-3b4a-4111-b01e-33d7aec0a065 XML
- Date Stamp
- 2021-05-12T06:01:54
- Metadata language
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eng; CAN
- Character set
- UTF8
- Hierarchy Level
- Dataset
http://ec.gc.ca
Data identification
- Date (Creation)
- 2016-09-16
- Date (Publication)
- 2019-03-31
- Status
- On going
- Metadata language
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eng; CAN
- Character set
- UTF8
- Topic category
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- Environment
- Maintenance and Update Frequency
- As needed
- Spatial representation type
- Vector
Keywords
- Theme
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Toxicity, soil, REE, microorganisms, plants, earthworms, invertebrates
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Government of Canada Core Subject Thesaurus
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Toxicology
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ECCC Information Category EN
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Nature and Biodiversity - Contaminants
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Geography
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National (CA)
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Business Functions
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Assess Toxicity, Manage and Monitor for Environmental Presence of Hazardous Substances and Waste
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Assess Toxicity of Substance
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external.theme.EC_Branch
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Science and Technology Branch
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external.theme.EC_Directorate
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Wildlife and Landscape Science
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external.theme.GC_Security_Level
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Unclassified
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- Use Limitation
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Open Government Licence - Canada ( http://open.canada.ca/en/open-government-licence-canada )
- Access Constraints
- Copyright
- Use Constraints
- Copyright
- Begin Date
- 2016-09-16
Extent
))
Ref. system Reference Systems
- Reference system identifier
- EPSG / 4326 /
Distribution
Distribution Formats
- Distribution format
-
-
EXE
(
Unknown
)
-
EXE
(
Unknown
)
http://ec.gc.ca
Overviews
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