Fluorescence Spectroscopy Applied to Monitoring Biodiesel Degradation: Correlation with Acid Value and UV Absorption Analyses

Figure 2

Absorbance values at (a) 232 nm and (b) 270 nm for biodiesels from S. indicum L. and R. sativus L. during the thermal degradation process. (c) and (d) show the absorbance ratios with formation of secondary compounds after ∼10 h of thermal degradation. Error bars represent standard deviations.

(a)

(b)

(c)

(d)