STEPHEN AUSMUS / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY STEPHEN AUSMUS / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
Editorial use only.
Biochar copper adsorption research. Chemists testing the properties of biochar, a form of charcoal (mostly carbon) produced by heating organic matter in the absence of oxygen. The column at lower left has been filled with poultry litter-based activated biochar. A solution of copper ions (blue) is being run through the biochar. The solution turns clear (sample held up at top right) as the copper ions are absorbed by the biochar. This research is being carried out by the Agricultural Research Service (ARS) of the US Department of Agriculture. Photographed in the USA.
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