An EcoAnalytix Biodiesel IR FAME Analyzer with a 9-bounce
diamond UATR accessory was used for this analysis. A series of
63 validation standards of soy biodiesel in fossil diesel was
prepared as described in ASTM D7371, and the spectra were
measured as described by the SOP included with the software.
Twenty-one of the spectra were used to derive a bias
correction to the provided calibration models, as described
in the SOP; this calibration transfer procedure is further
discussed in a separate article.5 The remainder of the spectra
was used to validate the performance of the models.