Table 3.

Results of PCA of physic-chemical and metal analysis of ice samples collected from Karachi.

Component	Eigenvalue	Percentage variance	Cumulative percentage variance	First 5 eigenvector coefficients	Associated variables
1	4.012	30.86	30.86	0.945	TDS
				0.922	Nitrate
				0.914	Hardness
				0.889	Chloride
				0.651	Sulphate
2	2.752	21.170	52.037	−0.837	Cr
				−0.792	Pb
				−0.758	Ni
				−0.651	As
				0.445	Sulphate
3	1.309	10.075	62.11	0.659	Fe
				0.657	Turbidity
				0.542	Zn
				−0.243	Chloride
				0.164	As