Environmental Systems Research

Table 9 Principal component analysis (PCA) for surface water samples

From: Environmental pollution loads on surface water chemistry and potentially ecological risks of inland aquatic ecosystem in South-Eastern State, Nigeria

	PC ₁	PC ₂	PC ₃
pH	− 0.157	0.763	− 0.223
Turbidity	0.765	− 0.41	− 0.006
Hardness as (CaCO₃)	0.923	− 0.334	0.046
COD	0.969	0.09	0.107
DO	0.987	0.022	− 0.02
Chloride	− 0.593	− 0.383	0.641
Calcium	0.973	0.181	− 0.041
Magnesium	0.521	0.74	− 0.016
Potassium	0.835	− 0.385	0.006
Sodium	0.542	− 0.18	0.796
Sulphate	0.187	0.842	− 0.314
Nitrate	− 0.24	0.932	0.075
Phosphate	− 0.53	− 0.738	− 0.195
Cadmium	0.944	0.039	0.265
Chromium	0.874	− 0.012	− 0.289
Copper	0.93	0.33	0.022
Iron	0.964	0.208	0.093
Lead	− 0.878	− 0.244	0.062
Zinc	0.952	0.149	0.159
Nickel	− 0.869	− 0.225	− 0.249
Total Eigenvector	12.191	4.184	1.506
% of Variance	60.953	20.922	7.532
Cumulative %	60.953	81.875	89.407

Values in bold make up the parameters with positive and negative loadings

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