As there seems to be no good reason why humans would not be imbibing plastics, researchers at Arizona State University have developed techniques for quantifying these contaminants in human tissues (https://www.theguardian.com/environment/2020/aug/17/microplastic-particles-discovered-in-human-organs). The main problem seems to be assessing the levels in organs without samples being added to by plastic particles in the surrounding air.Their methods were validated by adding material to a variety of human tissues (from an organ bank) before testing. One worrying feature was the detection of bisphenol A in all samples. This compound is associated with plastics and has effects on the endocrine (hormone producing) and reproductive systems of mammals. We essentially now live in a world where the air, oceans and our food are all full of microplastic particles. It turns out that it's not just marine life that has our plastics problem!
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