Some premium tea bags leach billions of microplastics per cup: study

Researcher Nathalie Tufenkji says she now avoids tea bags containing plastics

A McGill University professor says tea lovers may be swallowing billions of tiny plastic particles along with their favourite brew.

Nathalie Tufenkji published a study Wednesday in the U.S. journal Environmental Science & Technology that examined the amount of microplastics and nanoplastics released when four unnamed brands of tea bags were steeped in hot water.

Researchers at the Montreal university focused their analysis on premium brands that come in voluminous, silk-like bags, instead of the more common paper variety.

“We were expecting to see some particles — obviously, just naturally from putting this material in hot water — but we were shocked when we saw that it’s actually releasing billions of particles from a single tea bag,” Tufenkji said Wednesday.

After emptying the bags of tea leaves, researchers submerged the bags in “ultra pure” water heated to 95 degrees Celcius for five minutes. When they analyzed a sample of the water, they found that a single plastic tea bag released approximately 11.6 billion microplastics and 3.1 billion nanoplastics into a single cup.

Tufenkji said that’s far higher than what other studies have found in other foods, for instance table salt, a kitchen staple that’s been reported as containing plastic. While 16 micrograms of microplastic was recorded in one cup of tea, table salt has been found to contain 0.005 micrograms per gram.

Tufenkji said the health risk of ingesting microplastics and nanoplastics is unknown and that her study only measured how much plastic was released by plastic tea bags.

She said a “very preliminary” toxicity study exposed water fleas to the steeping water, and researchers noted the tiny invertebrates behaved differently and appeared to have an altered body shape.

READ MORE: Humans unknowingly eat 100,000 particles of plastic per year, says new UVic study

As for human consumption, she stressed that there is no evidence of toxicity.

“We don’t know if it is dangerous,” she said.

“There’s actually almost no studies on the toxicity of ingesting microplastics or nanoplastics so that’s something to be determined, but we do know (some tea bags are) releasing a lot of plastic into the actual tea.”

The study also found that far fewer particles were released when the tea bag was steeped at room temperature for five minutes.

But that’s not the norm when brewing tea, the study acknowledges, adding that tea drinkers often heat water above the measured temperature of 95 °C and that even “food grade” plastics may degrade or leach toxic substances when heated above 40 °C.

Tufenkji said she now avoids tea bags containing plastics, but largely because of her aversion to single-use plastics.

“I do drink loose-leaf tea or tea in a paper tea bag,” said Tufenkji.

“I still continue to enjoy tea, that’s for sure.”

— By Cassandra Szklarski in Toronto

The Canadian Press

READ MORE: Organic Matters tea recalled across B.C. due to Salmonella

Like us on Facebook and follow us on Twitter

Just Posted

County of Wetaskiwin concerned about provincial policing discussion

Lack of detail, lack of answers discussed at council Oct. 8

Rainbow Saddleback faces 15 break and enter related charges

Maskwacis, Wetaskiwin men charged by RCMP in relation to break and enters

Five things you should know about Impaired Driving

Too many risks, no rewards for impaired driving

Pigeon Lake re-zoning defeated by 2-5 county council vote

County of Wetaskiwin council denies Frank Dyck’s re-zoning

VIDEO: #MeToo leader launches new hashtag to mobilize voters

Tarana Burke hopes to prompt moderators to ask about sexual violence at next debate

Maskwacis RCMP seek public assistance to locate missing female

Maskwacis RCMP are asking for public assistance to locate 21 year-old Kiona… Continue reading

Alberta to join B.C.’s class-action lawsuit against opioid manufacturers, distributors

B.C. government claims opioids were falsely marketed as less addictive than other pain meds

VIDEO: Trudeau, Singh posture for ‘progressive’ votes while Scheer fights in Quebec

NDP Leader Jagmeet Singh, whose party has been on the rise in recent polls, is campaigning in Toronto

Advance voter turnout up 25% for first two days: Elections Canada

Two million people voted Friday and Saturday

In the news: Sprinting to the election finish line and anger amid Manitoba storms

First Nations residents forced to evacuate their Manitoba homes after a recent snowstorm

‘Save the kids!’ Dorian survivor tells the harrowing story of his Canadian wife’s death

Family held a funeral and placed Alishia Liolli’s remains in a niche at a cemetery in Windsor, Ont.

Singh says NDP would form coalition with the Liberals to stop Tories

Singh was in a Liberal-held riding Sunday afternoon in Surrey where he was pressed about his post-election intentions

PHOTOS: Kipchoge becomes first runner to dip under 2 hours for marathon

Olympic champion and world record holder from Kenya clocks 1 hour, 59 minutes and 40 seconds

Most Read