Unusual airborne toxin detected in the U.S. for the first time

A toxic chemical used in plastics and lubricants has been detected in U.S. air for the first time, with evidence pointing to an unexpected source: fertilizer made from treated sewage. | Contesto: cronaca

Punti chiave

• Unusual airborne toxin detected in the U.S. for the first time

Contesto

For the first time in the Western Hemisphere, scientists have detected airborne medium-chain chlorinated paraffins (MCCPs), a class of toxic industrial chemicals, drifting through the atmosphere in the United States. The discovery was made by researchers who were analyzing air samples for more common pollutants, stumbling upon the unexpected and concerning signature of these persistent compounds. The detection marks a significant new front in the study of environmental contamination, revealing a previously undocumented pathway for these substances to enter ecosystems and potentially impact human health. MCCPs are synthetic chemicals primarily used as flame retardants, plasticizers in plastics, and additives in metalworking fluids and lubricants. Their chemical structure makes them highly persistent in the environment, resistant to degradation, and prone to accumulating in living organisms. While their use has been regulated or banned in some jurisdictions due to health and environmental concerns, including their potential to cause cancer and damage the liver, their global production remains substantial. The detection of these chemicals in the air suggests they are volatilizing from products and entering the atmospheric cycle, joining other persistent organic pollutants that can travel vast distances on wind currents. The most startling aspect of the discovery is the identified likely source. According to the research, the airborne MCCPs appear to be emanating from agricultural fertilizer produced from treated sewage sludge, often referred to as biosolids. This points to a hidden and cyclical route of contamination: MCCPs used in consumer and industrial products are washed down drains, survive the wastewater treatment process, become concentrated in the resulting sludge, and are then spread onto farmland as a nutrient-rich soil amendment. From there, they can evaporate into the air, creating a secondary emission source far from their original industrial application. This revelation has significant implications for environmental policy and public health. The widespread use of biosolid fertilizers in agriculture is promoted as a sustainable practice, recycling...

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Categoria: cronaca