Multiple PAHs’ Detection under CDOM Interference Based on Excitation-Emission Matrix and Interval Selection

Figure 8

Frequency distribution of variables selected on (a) FLU, (b) PYR, (c) PHE, and (d) BaP by CPSO in the Mix-PAH dataset. Yellow indicates that the corresponding wavelength is selected at a higher frequency.

(a)

(b)

(c)

(d)