Yesterday (June 8) was World Oceans Day and Canadian Rivers Day is coming up on June 12. What better time to celebrate water?
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“During the winter months, contaminants accumulate in the snow,” says [University of Toronto Scarborough (UTSC) environmental chemist Torsten] Meyer, an expert on snow-bound organic contaminants and a post-doctoral fellow at UTSC. “When the snow melts, these chemicals are released into the environment at high concentrations.”
In a specially designed, temperature-controlled laboratory at UTSC—which includes a homemade snow-gun and a chemical pump—Meyer creates large baths of fresh snow already tainted with organic contaminants. This one-of-a-kind set-up enables the researcher to slowly melt his “dirty” snow, collect the melt-water and track which chemicals emerge from the snowpack and when.
Meyer’s research reveals a worrying surprise. “One of the main findings is that there is a peak contaminant flush at the very beginning of the melt,” he says. With the advent of spring, according to Meyer, comes a deluge of pollution.
By the time snow has turned black with muck and grime, many harmful chemicals — including those from pesticides, car exhaust, telecommunications wiring insulation, water repellent clothing, paints or coatings — may have already seeped out of the snow and into the surrounding ground water or surface water.
Pathogens such as bacteria and viruses, pharmaceuticals and chemicals, pesticides and run-off from mining sites also end up in lakes and rivers, bringing with them a slew of health and environmental risks.Abundant freshwater is one of Canada's most precious resources. If we know that our lakes and rivers are already in danger, why would we want to do even more harm to them?
“When groundwater contamination occurs it has the potential to have serious, negative human health, environmental and economic impacts,” the report says.
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Meanwhile, the question of what happens when all those contaminants mix together confounded the government officials.
“One outstanding issue the working group considered is that of cumulative effects,” the report says.
“This refers to the impacts that multiple contaminants have on aquatic ecosystems when they interact. Concerns apply to the majority of contaminants, and the issue is both not well understood and exceedingly complex.”