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

Figure 6

Fluorescence intensities of biodiesels from S. indicum L. and R. sativus L. during the thermal degradation process at specific wavelengths: (a) emission at ∼322 and (b) emission at 321 nm; (c, d) emission at 424 nm; (e) emission at 630 nm; (f) emission at 488 nm. Error bars represent standard deviations.

(a)

(b)

(c)

(d)

(e)

(f)