Trace Metal Contamination Characteristics and Health Risks Assessment of Commelina africana L. and Psammitic Sandflats in the Niger Delta, Nigeria

Table 6

PCA factor loadings of the concentrations of trace metals for sandflat soil and C. africana L. samples.

		Factor components
		1	2	3
Sandflat	Zn	−0.477	0.830	0.207
	Pb	0.880	−0.223	0.212
	Cd	0.923	−0.107	0.308
	Ni	0.663	0.724	0.038
	Cr	−0.837	−0.251	0.475
	Eigenvalue	2.994	1.338	0.410
	Variability (%)	59.879	26.755	8.207
	Cumulative %	59.879	86.634	94.841
C. africana L.	Zn	0.833	−0.470	0.037
	Pb	0.849	0.516	−0.021
	Cd	−0.690	0.304	0.637
	Ni	−0.724	0.430	−0.500
	Cr	0.791	0.600	0.083
	Eigenvalue	3.042	1.124	0.664
	Variability (%)	60.838	22.483	13.285
	Cumulative %	60.838	83.321	96.606

High factor loadings for each principle component are highlighted with bold type.