Clothes we wear are riddled with toxins: study

Researchers at the Stockholm University have found that chemicals used in manufacturing clothes remain on them even after being washed.

The study examined if there are chemicals in the clothes we buy. Several substances related to health risks were identified and not even organic cotton was a guarantee for non-toxic textiles, the university said on its website.

In a new thesis 60 garments from Swedish and international clothing chains were tested. An initial analysis found thousands of chemicals in the clothes and around a hundred chemicals were preliminary identified. Several of the substances were not on the producers' lists and are suspected to be by-products, residues or chemicals added during transport.

''Exposure to these chemicals increases the risk of allergic dermatitis, but more severe health effect for humans as well as the environment could possibly be related to these chemicals. Some of them are suspected or proved carcinogens and some have aquatic toxicity,'' said Giovanna Luongo, PhD in Analytical Chemistry at Stockholm University.

Depending on occurrence, quantity, toxicity and how easily they may penetrate the skin, four groups of substances were chosen for further analysis. The highest concentrations of two of these, quinolines and aromatic amines, were found in polyester. Cotton contained high concentrations of benzothiazoles, even clothes made from organic cotton.

The researchers washed the clothes and then measured the levels of chemicals. Some of the substances were washed off, with a risk of ending up in aquatic environments. Others remained to a high degree in the clothes, becoming a potential source of long-term dermal exposure.

It is difficult to ascertain if the levels of these harmful substances are hazardous, and what effects chemicals in our clothes can have in the long run.

''We have only scratched the surface, this is something that has to be dealt with. Clothes are worn day and night during our entire life. We must find out if textile chemicals go into our skin and what it means to our health. It is very difficult to assess and requires considerably more research,'' says Conny Östman, professor in analytical chemistry.