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Contaminants

The USGS Oklahoma-Texas Water Science Center monitors water-quality conditions and conducts studies to identify particular contaminants, from pesticides to pharmaceuticals to algal blooms, in Texas waters.

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Measuring volatilization

USGS Research: PAHs and Coal-Tar-Based Pavement Sealcoat

Coal-tar-based pavement sealant is a potent source of polycyclic aromatic hydrocarbons (PAHs), as documented by the USGS and other researchers. Coal-tar-based sealcoat products typically are 20 to 35% coal tar or coal-tar pitch—these materials are known human carcinogens that contain high concentrations of PAHs and related chemicals. Coal-tar-based pavement sealcoat typically contains 35,000 to...
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Oklahoma-Texas Water Science Center
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USGS Research: PAHs and Coal-Tar-Based Pavement Sealcoat

Coal-tar-based pavement sealant is a potent source of polycyclic aromatic hydrocarbons (PAHs), as documented by the USGS and other researchers. Coal-tar-based sealcoat products typically are 20 to 35% coal tar or coal-tar pitch—these materials are known human carcinogens that contain high concentrations of PAHs and related chemicals. Coal-tar-based pavement sealcoat typically contains 35,000 to...
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