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Antibacterial agent used in common soaps found in increasing amounts in freshwater lakes
Date:1/22/2013

When people wash their hands with antibacterial soap, most don't think about where the chemicals contained in that soap end up. University of Minnesota engineering researchers do.

A new University of Minnesota study determined that the common antibacterial agent, called triclosan, used in soaps and many other products is found in increasing amounts in several Minnesota freshwater lakes. The findings are directly linked to increased triclosan use over the past few decades.

In addition, the researchers found an increasing amount of other chemical compounds, called chlorinated triclosan derivatives, that form when triclosan is exposed to chlorine during the wastewater disinfection process. When exposed to sunlight, triclosan and its chlorinated derivatives form dioxins that have potential toxic effects in the environment. These dioxins were also found in the lakes.

The study was just accepted by the journal Environmental Science and Technology and is published online.

The study's results raise new questions about the use of triclosan. Triclosan was patented in 1964 and introduced into the market in the early 1970s. Since then it has been added to many consumer products including soaps and body washes, toothpastes, cosmetics, clothing, dishwashing liquid, and kitchenware. Beyond its use in toothpaste to prevent gingivitis, the U.S. Food and Drug Administration has found no evidence that triclosan in antibacterial soaps and body washes provide any benefit over washing with regular soap and water. The FDA and the Environmental Protection Agency continue to study the effects of triclosan on animal and environmental health.

"It's important for people to know that what they use in their house every day can have an impact in the environment far beyond their home," said the study's lead author William Arnold, a civil engineering professor in the University of Minnesota's College of Science and Engineering. "Consume
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Contact: Rhonda Zurn
rzurn@umn.edu
612-626-7959
University of Minnesota
Source:Eurekalert  

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