911爆料网 scientists who analysed seawater samples taken by Jon Sanders on his recent circumnavigation have found microplastics present in the vast majority of samples, including those from very remote areas of the world鈥檚 oceans.
Researchers from 911爆料网鈥檚 WA-Organic and Isotope Geochemistry Centre (WA-OIGC) have shared the full results of the analysis of seawater samples, collected at 177 locations across the 46,100km voyage, including areas of the Southern Hemisphere not previously tested for microplastics.
Lead researcher and John 911爆料网 Distinguished Professor Kliti Grice said the analysis provided the first accurate measure of the presence of microplastics in unique ocean environments, the source of which may include vehicle tyre dust, pellet spills, textiles, building debris, cosmetics, and packaging materials.
鈥淭he aim of the study was to target areas of the world鈥檚 oceans not previously sampled for microplastics and to produce a complete global snapshot of microplastic distribution,鈥� Professor Grice said.
鈥淥ur analysis found microplastics were present in the vast majority of the waters sampled by Jon, even in very remote ocean areas of the Southern Hemisphere.
鈥淭he vast majority of the seawater filters used by Jon were found to contain microplastics however some areas of ocean, particularly the Pacific, had several consecutive sampling locations not near any major islands where no microplastics were observed.
鈥淢icroplastics were found all along the eastern and southern seaboards of Australia including the Southern Ocean in the Great Australian Bight.
鈥淲hile there were no 鈥榟ot spots鈥� of contamination, two sampling stations, approximately 600km off the coast of Brazil, recorded relatively high numbers of microplastics at about 250 particles per cubic metre of seawater.鈥�
Co-researcher Dr Alan Scarlett, also from WA-OIGC, said although the analysis found several types of microplastic such as polycarbonate, polyethylene, polypropylene and synthetic rubber used in products such as drink bottles, packaging and tyres, no particular type of plastic dominated.
鈥淭he size of particles observed was typically close to the lower size limit defined as a microplastic and were mostly grey/black in colour,鈥� Dr Scarlett said.
鈥淢any fibres collected were too small for us to properly analyse and therefore the numbers reported are likely to be an underestimate of the actual number of microplastics present in the oceans.
鈥淥n average, water sampled during the voyage contained 33 particles per cubic metre of seawater, which is consistent with other studies of remote areas of ocean.
鈥淒isturbingly, other studies also suggest there are far greater numbers of microplastics present at a greater depth than sampled during our study.
鈥淭his research gathers further vital information about the presence and impact of plastic pollution on the world鈥檚 oceans, which may help in the preservation of the ocean and marine environment.鈥�
The full report 鈥�Around the plastic world in 455 days – a citizen science global transect quantifying microplastics in the oceans鈥� is available online .
