Microplastics discovered in Arctic snow
Published : Tuesday, 20 August, 2019 at 4:31 PM Count : 244
Arctic ice is being polluted by microplastic pollution.
According to new research, the tiny particles are transported by the atmosphere and are washed out of the air, especially by snow.
This means the synthetic material is now even present in sparsely populated areas, such as the Alps.
The study, conducted by Germany's Alfred Wegener Institute, raises fresh questions about how much plastic humans are unintentionally inhaling.
Published in the journal Science Advances, the data was reached after researchers samples from Helgoland, Bavaria, Bremen, the Swiss Alps and the Arctic.
Microplastics were found in high concentrations in snow at all of the sites - even in remote areas of the Arctic, on the island of Svalbard, and in snow on drifting ice floes.
Rubber most likely from car and lorry tires was one of the biggest sources of microplastics.
The lead researcher Dr Melanie Bergmann stated 'It's readily apparent that the majority of the microplastic in the snow comes from the air, similarly to dust from the Sahara can cover distances of 3,500 km or more within days' She added that this raises questions about how much plastic humans are inhaling.
The findings published in Science Advances showed that nitrile rubber - used in tires - was the dominant type of plastic in all samples, commonly used in countless applications from production of tyres to shoe soles.
Plastic -based paint particles were detected frequently in both ice cores and deep-sea sediment.
Around 98 per cent of these particles were smaller than 100 micrometres in size which raise a huge health concern, the scientists said.
Inhaling these particles may lead to irritation, inflammation and allergic reactions since previous studies found larger particles in lung cancer patients.
The samples with the highest concentration were gathered near a rural road in Bavaria - 154,000 particles per litre. The snow in the Arctic contained up to 14,400 particles per litre.
Researchers say the the microplastic concentrations found were considerably higher than those in studies conducted by other researcher in dust deposits, for example.
One of the study authors, Dr Gunnar Gerdts, said this could be due to one of two reasons.
He explained: 'First of all, snow is extremely efficient when it comes to washing microplastic out of the atmosphere.
'Secondly, it could be due to the infrared spectroscopy we used, which allowed us to detect even the smallest particles - down to a size of only 11 micrometres.' The scientists melted the snow and poured it through a filter before examining the trapped residue with an infrared microscope.
Depending on the type of plastic, different wavelengths of the infrared light are absorbed and reflected.
According to the researchers, a major portion of the microplastic in Europe, and even more in the Arctic, comes from the atmosphere and snow.
Dr Bergmann said: 'This additional transport route could also explain the high amounts of microplastic that we've found in the Arctic sea ice and the deep sea in previous studies.' She added: 'To date there are virtually no studies investigating the extent to which human beings are subject to microplastic contamination.' Most research has focused on how animals or human beings absorb microplastic from what they eat.
'But once we've determined that large quantities of microplastic can also be transported by the air, it naturally raises the question as to whether and how much plastic we're inhaling.'-Daily Mail