WEDNESDAY, Jan. 7 (HealthDay News) -- On a January night in 2005, a freight train with three tanker cars -- each loaded with 90 tons of chlorine -- slammed into a parked locomotive in the center of Graniteville, S.C., a town of 7,000 people about 15 miles from Augusta, Ga.
One tank ruptured during the 2 a.m. collision, releasing between 42 tons and 60 tons of chlorine gas that seeped into a nearby textile mill, where 180 people were working the overnight shift.
Eight people died at the accident scene, at least 525 people were treated in emergency rooms, and 71 people were admitted to nine hospitals in South Carolina and Georgia.
A new study examining the lingering effects of the disaster should serve as a blueprint for larger metropolitan areas looking to prepare for an accidental or terrorist release of the potentially deadly gas, the researchers said.
"This is one of the largest community exposures to chlorine gas since World War I," study lead author David Van Sickle, a Robert Wood Johnson Foundation Health & Society Scholar at the University of Wisconsin, said in a news release issued by The American Journal of Emergency Medicine, which published the report in its January issue.
"It was a tragic disaster that shows us what a significant challenge a large-scale chlorine gas release poses to health-care facilities," he said.
Hospitals need to be able to quickly recognize the signs of chlorine exposure and have enough mechanical ventilators on hand, he added.
Van Sickle was part of a team from the U.S. Centers for Disease Control and Prevention and the South Carolina Department of Health and Environmental Control (DHEC) that studied the accident's resulting health effects.
Chlorine gas is an irritating, fast-acting and potentially deadly inhalant. It's also one of the most widely used toxic chemicals -- water treatment and industrial manufacturing are examples of such use. Much of the 13 million to 14 million tons produced in the United States each year is transported by rail, often through populated areas, the news release said.
New U.S. regulations governing the transportation of rail cargo aim to prevent a similar disaster in a major metropolitan area. And, the U.S. Department of Homeland Security has identified a deliberate attack on a chlorine storage tank as a top concern. According to agency estimates, as many as 100,000 people would be hospitalized and 10,000 would die if a chlorine storage tank was attacked in an urban area, according to the release.
Van Sickle and his colleagues tried to learn as much as they could about the health effects from widespread exposure to chlorine gas.
According to the report, many people who were hospitalized showed signs of severe lung damage. More than a third were admitted to intensive care, and 10 percent required mechanical ventilation. Despite their injuries, most recovered quickly and were discharged within a week, according to the release.
"Public health agencies and hospitals across the country can learn a lot from this disaster and be better prepared to help in the next emergency," Dr. James J. Gibson, state epidemiologist and director of the Bureau of Disease Control at the South Carolina DHEC and a co-author of the report, said in the news release. "We continue to monitor area residents for any possible long-term health effects."
To learn more about chlorine, visit the U.S. Agency for Toxic Substances and Disease Registry.
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