“In recent years, microplastics have seemed to be everywhere,” said The Times: “not only clogging oceans and rivers, but also deep in our bodies.” Studies have claimed to find tiny plastic fragments in blood, livers, arteries, testes and placentas. However, some scientists are urging caution, warning that studies suffer from basic methodological weaknesses. Professor Leon Barron of Imperial College London says there are “blind spots” in tests of plastic content. Others went further. Dr Dušan Materic, of the Helmholtz Centre for Environmental Research in Germany, has called a wellpublicised recent study of plastic in the brain “a joke”.
The mass of plastics in a tissue sample is often tested by vaporising it, then capturing fumes, said Damian Carrington in The Guardian. But this method, dubbed Py-GC-MS, has been much criticised,…