It
is a daily ritual for some. Exfoliate your face and body with beauty
scrubs. Brush your teeth with whitening toothpaste. Clean your sink with
scrubbing gel cleansers. Throw your fleece hoodie and polyester shirt
into the washing machine. But could these simple acts be flushing
plastic into our lakes and oceans?
For years, scientists have been aware of plastic pollution in aquatic
environments. There are even areas in the oceans where water currents
have concentrated the plastic debris, creating large, floating patches
of plastic. However, it is only recently that scientists have started
looking into smaller particles of plastic in the water column. In some
cases, larger pieces break down into smaller fragments when they are
tossed around in the ocean. However, researchers in the Great Lakes in
North America found an abundance of round, plastic microbeads, less than
5 mm in diameter and not visible to the naked eye, which did not seem to
be broken down from larger fragments. Where did these tiny microplastics
come from?
The researchers soon matched the mysterious microbeads to facial and
body scrubs used by consumers. Although some companies use natural
ingredients such as apricot pits and cocoa husks, many have opted to use
plastic particles which are less harsh on delicate skin. Plastic
microbeads are also found in some types of toothpaste, chewing gum, and
cleaning products. Scientists in other parts of the world have even
found plastic fibers from synthetic clothing in coastal environments �
their research indicated that a single article of clothing can lose over
1,900 fibers every time it is washed. But how do these plastic fibers
and beads end up in the water?
Although microbeads and fibers that are washed down the drain go through
a sewage treatment facility, they are not always removed from the
treated water before it is released into lakes or oceans. The plastics
may float, making it difficult for the sewage treatment plants to
process them. Many treatment plants also have filters that will trap
larger debris but not these tiny beads and fibers. In addition, when
they are filtered out, the microplastics could still be present in the
sludge that is spread on fields as fertilizer, potentially getting
washed directly into nearby rivers by the rain. It is clear that
microplastics are entering the environment, but how dangerous are they?
Plastic production worldwide is estimated at about 225 million tons
yearly, and scientists estimate that it could take up to hundreds of
years for plastic to break down in the environment. This means that more
and more plastic will accumulate in lakes and oceans over time. The
concern is that organisms will eat the plastic beads, mistaking them for
fish eggs or other food. As the plastic takes up space in its digestive
system, the creature will eat less real food, missing out on the
nutrition it needs to grow and survive. As well, plastics can contain
chemicals such as fire retardants, and absorb metals, PCBs, and DDT,
which can cause health problems. Researchers have so far observed
microplastics in worms, mussels, and birds, and are concerned that the
harmful chemicals could accumulate up the food chain to humans. Research
into microplastics in the environment is relatively new, and more is
needed to understand the effects and solutions, but what can we do to
help tackle this problem?
Encouraging research into better sewage treatment filters for tiny
particles might help prevent plastics from getting into the environment
after they are washed down the drain. Research on reducing fiber loss in
synthetic fabric and improving washing machine designs could help
prevent the loss of plastic fibers from clothes in the first place. As a
consumer, you can choose to purchase products with natural abrasives
such as apricot pits and baking soda, and avoid scrubs and cleaners that
list ingredients such as polyethelene and polypropelene. Companies that
produce these products seem to be taking a hint when faced with the new
research, with L�Oreal, The Body Shop, and Johnson and Johnson
volunteering to phase out microbeads by 2015, and Proctor and Gamble by
2017. We may have been unknowingly flushing plastic waste into our lakes
and oceans all this time, but armed with our new knowledge we can
prevent the situation from getting worse.
References:
Avery-Gomm, S., et al. �Plastic Ingestion in Marine-Associated Bird
Species from the Eastern North Pacific.� Marine Pollution Bulletin 72
(2013) 257-259.
Besseling, Ellen, et al. �Effects of Microplastic on Fitness and PCB
Bioaccumulation by the Lugworm Arenicola marina (L.)� Environmental
Science Technology, 47(1) (2013) 593-600.
Betts, Kellyn. �Why Small Plastic Particles May Pose a Big Problem in
the Oceans.� Environmental Science Technology, 42 (24) (2008), 8995.
Browne, Mark A., Tamara Galloway, and Richard Thompson. �Microplastic �
An Emerging Contaminant of Potential Concern?� Integrated Environmental
Assessment and Management, Volume 3 Issue 4 (October 2007), 559-561.
Browne, Mark Anthony, et al. �Accumulation of Microplastic on Shorelines
Worldwide: Sources and Sinks.� Environmental Science Technology, 45 (21)
(2011) 9175-9179.
CBC News. �Facial Scrubs Polluting Great Lakes With Plastic.� [Online]
CBC.ca, July 31, 2013, 3:48 PM ET. http://www.cbc.ca/m/touch/technology/story/2013/07/31/tby-face-wash-beads-plastic-fish-consumption-great-lakes-thunder-bay.html
Doyle, Miriam J., et al. �Plastic Particles in Coastal Pelagic
Ecosystems of the Northeast Pacific Ocean.� Marine Environmental
Research, Volume 71, Issue 1 (February 2011) 41-52. http://www.sciencedirect.com/science/article/pii/S0141113610001650
Dubaish, Fatehi and Gerd Liebezeit. �Suspended Microplastics and Black
Carbon Particles in the Jade System, Southern North Sea.� Springer
Science and Business Media Dordrecht (January 17, 2013).
Quirks & Quarks (@CBCQuirks). �Facial Scrubs Polluting Great Lakes With
Micro Plastic.� [Online] Twitter, August 2, 2013, 8:49 A.M.
Wilson, Stiv J. Note to Suzanne Currie [email] The 5 Gyres Institute
(5gyres.org). August 21, 2013, 3:42 PM.
Zbyszewski, Maciej and Patricia L. Corcoran. �Distribution and
Degradation of Fresh Water Plastic Particles Along the Beaches of Lake
Huron, Canada.� Water, Air and Soil Pollution, Volume 220 Issue 1-4
(September 2011) 365-372.
Suzanne P. Currie, August 22, 2013. |
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