Unsafe levels of lead have been found in soil and sediments left behind in New Orleans following Hurricane Katrina and could pose a heightened health threat to returning residents, particularly children, according to a new study published in the American Chemical Societys journal Environmental Science & Technology. In some soil samples collected from the area, lead levels were as much as two-thirds higher than what the U.S. Environmental Protection Agency considers safe, according to researchers at Texas Tech University.
High concentrations of lead in the citys soil have previously been reported by others, but lead generally remains embedded in the soil and does not easily come in contact with people unless disturbed, says study leader Steven M. Presley, Ph.D., an environmental toxicologist at Texas Tech in Lubbock. He says that severe flooding may have loosened large amounts of embedded lead and caused it to be deposited on soil surfaces, where exposure to lead particles is more likely, either through skin contact or the inhalation of aerosolized particles. Lead exposure is a particular health concern among children because it can impair the nervous system and cause developmental problems.
Although lead is the biggest health concern, the scientists also found concentrations of aldrin (an insecticide), arsenic, and seven semivolatile organic compounds that exceeded EPA Region VI safe levels and are on EPAs list of known or suspected human carcinogens. In all, the researchers analyzed the sediment and soil samples for 26 metals and more than 90 semi-volatile compounds.
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