In a study appearing in the August issue of the journal Applied Geochemistry, Gabriel M. Filippelli, Ph.D., professor of earth sciences and department chair at Indiana University-Purdue University Indianapolis, conducted a literature review of studies of urban soils as a persistent source of lead poisoning and also investigated the lead burden in the soils from a number of cities, including Indianapolis.
His findings reveal that older cities like Indianapolis have a very high lead burden resulting in a lead poisoning epidemic among their youngest citizens.
Filippelli suggests two possible remedies, one of which he believes to be feasible from both the practical and monetary perspectives and doable almost immediately.
According to 2007 U.S. Census Bureau data, there are approximately 20 million children below the age of five in the United States, the age range of greatest susceptibility to the harmful affects of lead poisoning. Filippelli notes that about 2 percent of these children (approximately 400,000) have lead poisoning, many in epidemic proportions.
While acute lead poisoning from toys and direct ingestion of interior paint has received more publicity, these cases account for only a portion of children with lead poisoning. Many health officials are increasingly concerned with chronic lead poisoning, which occurs at lower levels of lead in the blood and are harder to diagnose. Babies and young children may develop chronic lead poisoning when playing in dirt yards or playgrounds or in areas with blowing dry soil tainted with the lead, which is ubiquitous in older urban areas.
“These national numbers for chronic lead poisoning are staggering but the percentage of affected children in older urban areas is much much higher than in rural areas or newer cities. The blowing soil and dust young children ingest contains large amount of lead from lead paint and leaded gasoline deposited decades ago, and from industrial contamination. In Indianapolis, we found high levels of soil contamination. Many older urban centers, have lead poisoning rates that are 5 to10 times the national average.” said Filippelli, who is a biogeochemist studying environmental contamination of heavy metals and its effects on children’s health.
Going into neighborhoods where yards are dirt rather than grass-covered and spraying clean water with high power shower systems when tests show that soil moisture is low (usually mid-July to mid-September in Indianapolis, for example), would significantly decrease the chronic lead poisoning in children, according to Filippelli. Since contaminated dirt blows from one property to another, this cannot be done on a house by house basis but must be carried out on a regional basis.
A better but less feasible remedy would be to put a layer of clean soil on top of the contaminated soil and to hydroseed the fresh dirt with grass. While preferable it is less practical as the grass has to be maintained, more costly and probably unrealistic to expect money-strapped municipalities to attempt. The high end remedy, removal of all contaminated dirt, perhaps two feet deep, is unattainable, except in small areas around industrial sites such as lead smelters.
Lead levels in the dirt in which children play are a public health hazard. “Our review plus the new directions we suggest for remoisturizing soil to prevent blowing of contaminants, confirm that our approach to estimating lead burden and its remediation can be done anywhere in the U.S. where there is a lead concern. The Environmental Protection Agency and the U.S. Department of Housing and Urban have focused their attention on indoor contamination as the direct source of lead to children. It is now time to open the door and solve the contaminated soil problem. We hope our study will raise awareness, and ultimately funding, to stop the poisoning of America’s children, especially those living in older urban areas,” said Filippelli, who is associate director of the Indiana University Center for Environmental Health.
Young children, especially those who crawl, put objects in their mouth, eat dirt, or are exposed to blowing dirt, and can consume a significant amount of lead. Children’s developing digestive systems are very susceptible to lead poisoning. To a child’s body, lead looks like calcium because they both have same ionic charge and size. As their neurons develop, the nervous system tries to use lead in place of calcium and the child’s neural systems fail to form correctly. This impairs neural function leading to irreversibly decreased IQ and increased attention deficient issues.
Chelation, which purges lead from the body, is used to treat acute lead poisoning but is much less effective in chronic lead poisoning.
Dr. Filippelli is a leader in the emerging field of medical geology. He is the first elected chair of the Geological Society of America’s Geology and Health Division and is currently immediate past chair. This study was funded by the IUPUI School of Science.
Cindy Fox Aisen | Newswise Science News
New model connects respiratory droplet physics with spread of Covid-19
21.07.2020 | University of California - San Diego
Risk of infection with COVID-19 from singing: First results of aerosol study with the Bavarian Radio Chorus
03.07.2020 | Klinikum der Universität München
Scientists at the Fraunhofer Institute for Laser Technology ILT have come up with a striking new addition to contact stamping technologies in the ERDF research project ScanCut. In collaboration with industry partners from North Rhine-Westphalia, the Aachen-based team of researchers developed a hybrid manufacturing process for the laser cutting of thin-walled metal strips. This new process makes it possible to fabricate even the tiniest details of contact parts in an eco-friendly, high-precision and efficient manner.
Plug connectors are tiny and, at first glance, unremarkable – yet modern vehicles would be unable to function without them. Several thousand plug connectors...
An international research team has found a new approach that may be able to reduce bone loss in osteoporosis and maintain bone health.
Osteoporosis is the most common age-related bone disease which affects hundreds of millions of individuals worldwide. It is estimated that one in three women...
Traditional single-cell sequencing methods help to reveal insights about cellular differences and functions - but they do this with static snapshots only...
“Core-shell” clusters pave the way for new efficient nanomaterials that make catalysts, magnetic and laser sensors or measuring devices for detecting electromagnetic radiation more efficient.
Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles – smallest...
An international research team with Prof. Cornelia Denz from the Institute of Applied Physics at the University of Münster develop for the first time light fields using caustics that do not change during propagation. With the new method, the physicists cleverly exploit light structures that can be seen in rainbows or when light is transmitted through drinking glasses.
Modern applications as high resolution microsopy or micro- or nanoscale material processing require customized laser beams that do not change during...
23.07.2020 | Event News
21.07.2020 | Event News
07.07.2020 | Event News
06.08.2020 | Earth Sciences
06.08.2020 | Power and Electrical Engineering
06.08.2020 | Life Sciences