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Organic contaminant amplification during snowmelt
1Department of Chemical Engineering and Applied Chemistry, University of Toronto Scarborough, Toronto, ON, Canada.
Water Research
|January 29, 2008
Summary
Organic contaminants released from melting snow threaten ecosystems and human health. Their release timing and concentration depend on snowpack properties and contaminant type, impacting water quality.
Area of Science:
- Environmental Science
- Hydrology
- Ecotoxicology
Background:
- Melting snow releases organic contaminants, posing risks to aquatic/terrestrial life and human water/food sources.
- Spring peak contaminant concentrations in snowmelt-fed waters necessitate understanding contaminant behavior during melting.
Purpose of the Study:
- To provide a qualitative overview of organic contaminant release processes from melting snowpacks.
- To analyze the influence of snowpack properties and contaminant partitioning on release dynamics.
Main Methods:
- Critical review synthesizing current knowledge on snow metamorphosis, snowmelt hydrology, and chemical partitioning in snow.
- Analysis of elution sequences based on contaminant properties (water-soluble vs. hydrophobic) and snowpack characteristics.
Main Results:
- Water-soluble contaminants elute early at high concentrations; hydrophobic contaminants bound to particles release later.
- Deep, metamorphosed snowpacks promote shock releases; shallow snow over warm ground leads to less pronounced releases.
- Meltwater runoff over frozen ground causes direct contaminant shock loads; permeable soils offer buffering.
Conclusions:
- Snowmelt contaminant release is governed by snowpack physical properties and contaminant partitioning behavior.
- Further quantitative understanding requires controlled lab studies, field investigations, and numerical process models for water quality and contaminant fate.
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