The Emissions Database for Biodiesel Used in Heavy-Duty Engines summarizes testing data on the effect of using biodiesel and biodiesel-diesel blends in on-road heavy-duty vehicles and engines that are certified as such by the U.S. Environmental Protection Agency. The database includes testing that is representative of the effect of biodiesel (from various sources and at various concentrations) on on-road emissions testing.
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(The success of the biodiesel fuel industry relies heavily on biodiesel testing <http://www.youtube.com/watch?v=s32Ke2VzrqU>, not only at the production level but at the consumer level, where degraded fuel may cause engine failures.  Of major concern to diesel and biodiesel users is the very real possibility that water has contaminated their fuel. (See http://www.youtube.com/watch?v=0YcczdvPyAk).  The potential catastrophic impact of this problem is discussed at length  in this video at: http://www.youtube.com/watch?v=-lh4qhXc_5s&feature=youtube_gdata.
Fleet Fuel's  family of inexpensive biodiesel test kits  is just a click away on the internet at:
<http://fleetbiodiesel.com/biodiesel_testing_and_supplies.html>)