Quantitative Determination of Chlormequat Chloride Residue in Wheat Using Surface-Enhanced Raman Spectroscopy

Figure 5

Scatter plot of first two principal component scores obtained by KPCA with of 1000 (a), 5000 (b), 8000 (c), and 10000 (d); PC1: the first principal component. PC2: the second principal component.

(a)

(b)

(c)

(d)