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Drilling Industry News

Does Manganese Inhaled from the Shower Represent a Public Health Threat?

July 28, 2005
Special Web feature.

National Driller July 2005 e-Newsletter

A new analysis based on animal studies suggests that showering in manganese-contaminated water for a decade or more could have permanent effects on the nervous system. The damage may occur even at levels of manganese considered safe by the U.S. Environmental Protection Agency (EPA), according to researchers from Wake Forest University School of Medicine.

“If our results are confirmed, they could have profound implications for the nation and the world,” says John Spangler, M.D., an associate professor of family medicine. “Nearly nine million people in the United States are exposed to manganese levels that our study shows may cause toxic effects.”

The study is the first to show the potential for permanent brain damage from breathing vaporized manganese during a shower. It was conducted by reviewing the medical literature and calculating, based on animal studies, the amount of manganese people would absorb by showering 10 minutes a day.

Because manganese is monitored in public water supplies, high levels of this naturally occurring metal are especially found in wells and private water supplies.

Everyone is exposed to small levels of manganese, which is found in food and many types of rocks and enters the air, soil and water. But, at higher levels, manganese is toxic to the central nervous system and can cause learning and coordination disabilities, behavioral changes and a condition that is similar to Parkinson's disease.

The EPA has set 0.05 milligrams/liter as the upper limit of manganese advisable in water supplies. The limit, however, is based on odor and taste of the water. The potential risk of manganese accumulating in the brain through showering has not been considered by the EPA in setting this limit. In their analysis, Spangler and Elsner found that concentrations well below 0.05 milligrams might lead to brain injury.

“Inhaling manganese, rather than eating or drinking it, is far more efficient at delivering manganese to the brain,” says Spangler. “The nerve cells involved in smell are a direct pathway for toxins to enter the brain. Once inside these small nerves, manganese can travel throughout the brain.”

The researchers note that while limitations to their calculations do exist, regulatory agencies have not considered this potential pathway when setting drinking water standards.

“The manganese, as it settles from car exhaust onto streets and highways, may enter the water supply, increasing manganese levels in the water we drink and bathe in,” says Spangler.

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