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http://www.bbc.com/news/science-environment-43388870

In the largest investigation of its kind, 250 bottles bought in nine different countries were examined.

Research led by journalism organisation Orb Media discovered an average of 10 plastic particles per litre, each larger than the width of a human hair.

Sherri Mason, a professor of chemistry at the university, conducted the analysis and told BBC News: "We found [plastic] in bottle after bottle and brand after brand.

"It's not about pointing fingers at particular brands; it's really showing that this is everywhere, that plastic has become such a pervasive material in our society, and its pervading water - all of these products that we consume at a very basic level."

The research into bottled water involved buying packs from 11 different global and national brands in countries chosen for their large populations or their relatively high consumption of bottled water.

These were:

Leading international brands:

Aquafina
Dasani
Evian
Nestle Pure Life
San Pellegrino
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