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Home Science News Chemistry

The longer spilled oil lingers in freshwater, the more persistent compounds it produces

April 25, 2024
in Chemistry
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Oil is an important natural resource for many industries, but it can lead to serious environmental damage when accidentally spilled. While large oil spills are highly publicized, every year there are many smaller-scale spills into lakes, rivers and oceans. And, according to research published in ACS’ Energy & Fuels, the longer that oil remains in freshwater, the more chemical changes it undergoes, creating products that can persist in the environment.

Oil is an important natural resource for many industries, but it can lead to serious environmental damage when accidentally spilled. While large oil spills are highly publicized, every year there are many smaller-scale spills into lakes, rivers and oceans. And, according to research published in ACS’ Energy & Fuels, the longer that oil remains in freshwater, the more chemical changes it undergoes, creating products that can persist in the environment.

Approximately 600,000 gallons of oil were accidentally spilled into the environment in 2023, according to the International Tanker Owners Pollution Federation, a group that monitors oil spills. This figure represents ocean spills as well as freshwater spills in rivers and lakes. Over time, this oil weathers and undergoes a variety of chemical transformations, which could make compounds that are more soluble in water and stick around longer. Weathering in salt water is reasonably well understood, but what happens to oil in freshwater is still being investigated. So, Dena McMartin and colleagues investigated the chemical changes that could happen to that oil as it sits in rivers and lakes.

The team simulated a freshwater oil spill in the laboratory by combining water and river sediment collected directly from the North Saskatchewan River in Alberta, Canada, in a tank and then adding conventional crude oil obtained from a pipeline operator in Alberta. The test was carried out at around 75 degrees Fahrenheit for 56 days. Water samples were taken at multiple time points from the simulated spill and subjected to Fourier-transform ion cyclotron resonance (FT-ICR) and ion trap mass spectrometry, which provided detailed information into the chemical makeup of these complicated mixtures.

Researchers concluded that as the oil weathered, more and more oxygen atoms were incorporated into some compounds, causing them to become more persistent in water. As a result, higher concentrations of the oxygen-loaded chemicals could build up, potentially increasing the impact on aquatic organisms. This increase in oxygen atoms was observed for sulfur oxide compounds, along with some other classes of compounds present in the crude oil mixture. McMartin and team members say these results emphasize the importance of rapid responses to oil spills and could help set benchmarks for longer-term remediation efforts.

The authors acknowledge funding from the National Science Foundation, the Engineering Council of Canada and the Oceans Protection Plan of the Government of Canada.

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The American Chemical Society (ACS) is a nonprofit organization chartered by the U.S. Congress. ACS’ mission is to advance the broader chemistry enterprise and its practitioners for the benefit of Earth and all its people. The Society is a global leader in promoting excellence in science education and providing access to chemistry-related information and research through its multiple research solutions, peer-reviewed journals, scientific conferences, eBooks and weekly news periodical Chemical & Engineering News. ACS journals are among the most cited, most trusted and most read within the scientific literature; however, ACS itself does not conduct chemical research. As a leader in scientific information solutions, its CAS division partners with global innovators to accelerate breakthroughs by curating, connecting and analyzing the world’s scientific knowledge. ACS’ main offices are in Washington, D.C., and Columbus, Ohio.

To automatically receive news releases from the American Chemical Society, contact newsroom@acs.org.

Note: ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies.

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Journal

Energy & Fuels

DOI

10.1021/acs.energyfuels.3c04994

Article Title

“Evaluations of Weathering of Polar and Non-Polar Petroleum Components in a Simulated Freshwater Oil Spill by Orbitrap and Fourier Transform Ion Cyclotron Resonance Mass Spectrometry”

Article Publication Date

8-Apr-2024

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