Plastics Suck Up Other Toxins: Double Whammy for Marine Life, Gross for Seafood



Photo courtesy of Kent K. Barnes / kentkb

Some plastics are worse than others for the marine life that accidentally or intentionally eat them. That’s because not only are the plastics themselves toxic but some also act as sponges for other toxins. Unfortunately the most commonly produced plastics also absorb the most chemicals. This according to a new study in early view in Environmental Science & Technology

“It surprised us that even after a year some plastics would continue to take up contaminants.”

The researchers measured the absorption of persistent organic pollutants (POPs)—specifically polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs)—to the five most common types of mass-produced plastics:

  • Polyethylene terephthalate (PET). Recycling symbol #1. Example: Water bottles.
  • High-density polyethylene (HDPE). Recycling symbol #2. Example: Detergent bottles. 
  • Polyvinyl chloride (PVC). Recycling symbol #3. Example: Clear food packaging
  • Low-density polyethylene (LDPE). Recycling symbol #4. Example: Plastic shopping bags
  • Polypropylene (PP). Recycling symbol #5. Example: Yogurt containers, bottle caps.

From this research it seems that stuff made from polyethylene and polypropylene likely poses a greater risk to marine animals (and presumably the people that eat them) than products made from PET and PVC. Though the authors note that PVC is carcinogenic and toxic all by itself.

Laysan albatross carcass filled with ingested plastic debris, Midway Island. Nearly all carcasses found here have marine debris in them. It’s estimated that albatross feed their chicks ~10,000 lbs of marine debris annually on Midway. Andy Collins, NOAA Office of National Marine Sanctuaries

The authors were also surprised to find how long the plastics kept absorbing the contaminants. At one site they estimated it would take 44 months for high-density polyethylene to stop absorbing POPs.

“As the plastic continues to degrade, it’s potentially getting more and more hazardous to organisms as they absorb more and more contaminants,” says lead author Chelsea Rochman (UC Davis). 

The research was conducted over a year at five sites in San Diego Bay with pellets of each type of plastic immersed in seawater and retrieved periodically for absorption measurements. 

The paper:

  • Chelsea M. Rochman, Eunha Hoh, Brian T. Hentschel, and Shawn Kaye. Long-Term Field Measurement of Sorption of Organic Contaminants to Five Types of Plastic Pellets: Implications for Plastic Marine Debris. Environmental Science & Technology (2013). 
 

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SIX TRUTHS

Reclaiming power from those who abuse it often starts with telling the truth. And in "This Is How Authoritarians Get Defeated," MoJo's Monika Bauerlein unpacks six truths to remember during the homestretch of an election where democracy, truth, and decency are on the line.

Truth #1: The chaos is the point.

Truth #2: Team Reality is bigger than it seems.

Truth #3: Facebook owns this.

Truth #4: When we go to work, we're in the fight.

Truth #5: It's about minority rule.

Truth #6: The only thing that can save us is…us.

Please take a moment to see how all these truths add up, because what happens in the weeks and months ahead will reverberate for at least a generation and we better be prepared.

And if you think journalism like Mother Jones'—that calls it like it is, that will never acquiesce to power, that looks where others don't—can help guide us through this historic, high-stakes moment, and you're able to right now, please help us reach our $350,000 goal by October 31 with a donation today. It's all hands on deck for democracy.

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