Florida International University researchers are examining how rain flushes toxic tire-wear pollutants into the Hillsborough River to help safeguard local ecosystems. The study, led by Assistant Research Professor Kassidy Troxell, focuses on 6PPD, a chemical added to tires to extend their lifespan.
Urban Stormwater Contamination
As tires wear down, rain events wash tiny tire dust particles into nearby rivers, canals, and bays. The chemical transforms into a compound called 6PPD-Q, which is highly toxic to some Pacific Northwest salmon species. The 10-month study analyzed 50 distinct water samples along the roughly 60-mile span of the river.
The highest concentrations appeared in urban areas near stormwater outfalls after long dry periods were followed by heavy rainfall. A water sample collected near downtown Tampa measured around 12 nanograms per liter, exceeding the Environmental Protection Agency benchmark of 11 nanograms per liter.
Regional Environmental Impact
While the 12 nanograms per liter reading near Tampa is not a major concern yet, researchers say addressing it now is vital. Tracking how these chemical particles move through watersheds will help experts protect vulnerable Florida species and aquatic ecosystems.
The next phase of the university study begins in September, when the research team will collect additional water samples. Scientists are also developing a potential treatment using sargassum-based biochar to actively filter and remove the pollutants from the water.
Original reporting: Tampa Bay Florida News (HLL/CB) — read the source article.
