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New research suggests biofuel blending is often inaccurate
Date:2/27/2008

While sampling blended biodiesel fuels purchased from small-scale retailers, researchers at the Woods Hole Oceanographic Institution found that many of the blends do not contain the advertised amount of biofuel.

Marine chemist Chris Reddy and colleagues sampled pure biodiesel and blends from more than a dozen distributors across the United States. When testing fuels listed as 20 percent biodiesel (commonly known as B20), they found that the actual percentage of biofuel ranged from as little as 10 percent to as much as 74 percent. Only 10 percent of samples met the specifications for biofuel blends required for vehicles of the U.S. Department of Defense, one of the leading consumers of the products.

Pure biodiesel (B100) is a chemically prepared mixture of animal fats and vegetable oils, and it is often used in modified diesel engines. Biodiesel blends combine B100 with traditional petroleum-based fuels in a manner that allows them to be used in regular diesel engines. Retailers commonly sell blends that are 20 percent biodiesel (B20) or 5 percent (B5), while all diesel fuels sold in Minnesota are actually B2 (2 percent biofuel), in accordance with state standards.

Proponents of such fuels claim that they are more environmentally friendly because they emit less pollutionsuch as sulfur, particulates, and hydrocarbonsand may be less toxic for the environment when spilled.

Biodiesel is a great product if used properly, and it could turn out to be an important alternative fuel, said Reddy, an associate scientist in the WHOI Department of Marine Chemistry and Geochemistry. There is a lot of good feeling about biodiesel, but if we are going to sell it, we have to make sure what is being sold is accurately prepared. It is a matter of credibility and consumer confidence.

Reddy and colleagues happened upon the discrepancy while studying the potential effects of a biodiesel spill in the marine environment. The new research was
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Contact: Media Relations
media@whoi.edu
508-289-3340
Woods Hole Oceanographic Institution
Source:Eurekalert

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