EAST LIVERPOOL — Results of a health study regarding the effects of airborne manganese on local residents indicate that those exposed to the mineral are showing some health effects.
The results of the study conducted by the San Francisco State University were shared Thursday with the city’s board of health and later that evening with the community at a public session at Kent State University’s downtown campus.
The local study compared results of a similar study conducted in 2009 in Marietta, located near a smelter that emits manganese, and Mount Vernon, which has no large airborne source of the mineral.
In East Liverpool, prior investigations had determined that the greatest source of manganese in the city is S.H. Bell, a raw products storage and packaging facility in the East End.
According to George Bollweg of the Environmental Protection Agency, Region 5, manganese levels in the city are the highest in Region 5 and probably in the entire country.
These high levels prompted this study, which involved four different universities in three countries, two federal agencies, the Ohio Department of Health and experts from around the globe.
Participants were adults between the ages of 30 and 75 who had lived within two miles of the S.H. Bell facility for 10 years or more, excluding anyone who ever worked at the company.
In addition to blood tests, participants were subjected to a battery of neurological and neuropsychological tests, as well as having their nails and hair tested to measure a multitude of areas.
Among those were cognitive flexibility, information processing, working memory and attention, visual tracking speed, verbal skills, motor dexterity and strength, postural sway and tremors.
What the study ultimately showed, according to Dr. Rosemarie Bowler of San Francisco State University, is that East Liverpool residents’ blood had higher average cadmium levels than Mount Vernon but lower mercury levels than Marietta but were still within normal range of the general population.
As for neurological issues, city residents showed slower movement initiations than Mount Vernon residents but were slightly better than Marietta residents.
More hand tremors were seen in East Liverpool residents than Marietta and they also had more pronounced postural sway (involuntary swaying or inability when standing on both feet) than both Marietta and Mount Vernon.
The scores in all three communities for neuropsychological tests were in normal ranges except for divided memory, visual memory and motor speed, with East Liverpool residents testing lower than those in Marietta for immediate memory, which includes things normally done to care for oneself, such as eating, bathing, dressing, grooming and working.
East Liverpool residents also had lower scores than the other two communities in word reading, motor speed, motor strength and motor tactile.
Bowler reported that living closer to the manganese source resulted in increased tremors and also in lower motor speed and grip strength scores, noting, “We can’t say it is caused by manganese but it could be related.”
Those with higher manganese levels in their blood did have more symptoms, she added.
“We’re learning from your participation,” Bowler said, adding that it was determined that blood may not be the ideal biomarker, so evaluations of hair and toenails will be continued in future studies.
And while S.H. Bell has been targeted as the source of the manganese, Bollweg emphasized that the company has drastically reduced its output of the mineral between 2003 and 2012.
Findings against the company and resulting orders were imposed by the USEPA in 2008 and 2010 and Bollweg said decreases were generally seen after that.
“We believe 2013 will be consistent,” he said.