Quebec Govt. Reports High
Marine Pollution Caused by Plastic Microbeads Used in Cosmetics*
MC@Tech | MC@Beauty Inc. - Oct 7, 2014
Researchers
from McGill University and the Quebec government have discovered microplastics
(in the form of polyethylene 'microbeads,' less than 2 mm
in diameter) widely distributed across the bottom of the St. Lawrence River,
the first time such pollutants have been found in freshwater sediments. It is crucial to be aware of the types of beads you are consuming - there are many safe dissolvable and biodegradable options - polyethylene is not currently considered one of them for this particular type of cosmetic application such as sloughing or exfoliating.
The microbeads likely originate from cosmetics,
household cleansers, or industrial cleansers – all products in which they are
commonly used as abrasives. Owing to their small size and buoyancy, they may
readily pass through sewage treatment plants. Microplastics are a global
contaminant in the world's oceans, but have only recently been detected in the
surface waters of lakes and rivers.
Researchers lowered a steel grab from a boat to
collect sediment from ten locations along a 320-km section of the river from
Lake St. Francis to Québec City.
Microbeads were sieved from the sediment, and
then sorted and counted under a microscope. "We found them in nearly every
grab sample taken. The perfect multi-coloured spheres stood out from natural
sediment, even though they were the size of sand grains", said the lead author
of the study, Rowshyra Castañeda, a former McGill MSc student (now at
University of Toronto).
At some locations, the researchers measured over a
thousand microbeads per liter of sediment, a magnitude that rivals the world's
most contaminated ocean sediments. "We were surprised to find such
concentrations at the bottom of a river", says McGill professor Anthony
Ricciardi, who supervised the study.
"It was previously assumed that
floating microplastics are flushed through rivers to the sea. Now we have
evidence that rivers can act as a sink for this pollution."
The prevalence of microplastics in the St. Lawrence
River raises the possibility that they are being consumed by fish and other
animals. The environmental effects of microplastics are poorly known; but the
surfaces of such particles attract chemical pollutants, including PCBs, which
can be transferred to animals that ingest the plastics. "At present, we
cannot predict the consequences of the accumulation of these non-biodegradable
particles in freshwater ecosystems" added Ricciardi, whose lab is
investigating whether the microbeads are being consumed by fish in the river.
With growing recognition of microplastics as an
emerging threat to waterways, some U.S. states (Illinois, New York, Minnesota,
Ohio, California) have recently adopted or are considering legislation that
bans the use of plastic microbeads in cosmetics. No such legislation has yet
been proposed in Canada.
Source: McGill
University
*specialchemistry4cosmetics
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