Fig. 2a shows that the most persistent dye was the brown one,
which was still present until approximately 30 min. It can also be
observed that an intermediate was formed from the very beginning
of the degradation, and that the concentration of this compound
increased for 20 min, after which time it also degraded and no signal
corresponding to the new degradation products could be observed.
All the quality parameters of this resolution, expressed in the second
column of Table 2, are satisfactory. However, we should point out
that the spectrum of the orange dye has a lower correlation
coefficient than the other dyes. This may indicate that the corresponding
concentration profile does not fit perfectly.