Skip to main content
U.S. flag

An official website of the United States government

A scientist collects a groundwater sample with a syringe

Detailed Description

A scientist collects a groundwater sample to analyze for arsenic and other chemicals from a well installed in a wetland at the National Crude Oil Spill Fate and Natural Attenuation Research Site, near Bemidji, Minnesota. Researchers collected samples over a two-month period to quantify rates of arsenic release from aquifer sediments as organic carbon in the form of petroleum byproducts and ethanol biodegraded in the aquifer. 


Public Domain.