Application of Multivariate Statistical Analysis in Evaluation of Surface River Water Quality of a Tropical River

Table 5

Loadings of the physicochemical parameters on the first six varimax-rotated PCs (eigenvalue > 1) along the Batang Baram and its tributaries.

Rotated Component
Parameter	Component
	1	2	3	4	5	6
Total discharge			+0.900
Mean velocity		+0.674	+0.640
Mean depth			+0.712
Temperature				−0.904
pH		−0.451		−0.607		+0.444
Conductivity	−0.605		−0.476
DOsat		−0.750	+0.488
DO			+0.678
Turbidity	+0.948
Transparency	−0.791
Chl a						−0.906
TSS	+0.956
BOD5		+0.854
COD			−0.423		−0.692
TP		+0.850
TAN				+0.780
NO2					+0.784
NO3		+0.612		+0.563
Org-N		+0.716
H2S	+0.759			+0.427
Initial eigenvalue	6.0	3.7	2.7	1.7	1.4	1.2
% of variance	30.1	18.6	13.5	8.7	6.8	5.9
Cumulative %	30.1	48.7	62.2	70.9	77.7	83.6

converged in 11 iterations.